KAJIWARA Takashi
| Faculty Division of Natural Sciences Research Group of Chemistry | Professor |
Last Updated :2025/06/13
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Name (Japanese)
KajiwaraName (Kana)
Takashi
■Ⅱ．研究活動実績
Published Papers
- American Chemical Society (ACS), Molecular thermal engine based on a highly flexible elastic crystal, Hinako Kato; Yoji Horii; Chiharu Watanabe; Toshiyuki Sasaki; Kouhei Ichiyanagi; Mariko Noguchi; Hiroki Fujimori; Taro Yamamoto; Hal Suzuki; Yuichi Hirai; Takahito Ohmura; Keigo Yano; Shotaro Hayashi; Takashi Kajiwara, Materials that exhibit actuation behaviour in response to external stimuli have a wide range of applications owing to their ability to convert input energy into mechanical work. Light and chemicals are common sources of input energy. However, actuation using thermal energy from ambient-temperature sources remains challenging. In this study, we introduce novel elastic crystals composed of dodecylated porphyrin molecules that exhibit high flexibility and deformation in response to temperature changes. When a crystal is loaded with a small weight and positioned between high- and low-temperature heat sources, it exhibited continuous, large, and rapid oscillations. These oscillations persisted for at least 160 h, corresponding to 3.9 million deformation cycles, as long as the temperature difference was maintained. This study presents the first example of a molecular crystal functioning as an engine that can extract kinetic energy from static and ambient-temperature sources., 09 Jan. 2025, 10.26434/chemrxiv-2025-tpnjj
- Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Two-dimensional metal–organic nanosheets composed of single-molecule magnets: structural modulation and enhanced magnetism utilizing steric hindrance effect, Ikumi Aratani; Yoji Horii; Yoshinori Kotani; Hitoshi Osawa; Hajime Tanida; Toshiaki Ina; Takeshi Watanabe; Yohko F. Dr Yano; Akane Mizoguchi; Daisuke Takajo; Takashi Kajiwara, Two-dimentional arrays of single-molecule magnets (SMMs) are a prerequisite for the construction of devices with ultrahigh-density magnetic memory based on molecular spintronics. The advantage of using such molecules in inorganic-based..., Nov. 2023, Scientific journal, 10.1039/d3tc03360k
- Chemical Communications, Royal Society of Chemistry (RSC), Molecular elastic crystals exhibiting slow magnetic relaxations, Hinako Kato; Yoji Horii; Mariko Noguchi; Hiroki Fujimori; Takashi Kajiwara, We report an elastic crystal of a copper(II) porphyrinato complex that exhibits slow magnetic relaxations and is a promising candidate for an external-force-responsive spin qubit., Nov. 2023, Scientific journal, 10.1039/d3cc04770a
- Refereed, The Journal of Physical Chemistry C, American Chemical Society (ACS), Slow Magnetic Relaxation of Linear Trinuclear M(II)–Gd(III)–M(II) Complexes with D3 Point Group Symmetry (M(II) = Zn(II) and Mg(II)), Yuka Masuda; Shiomi Sakata; Saori Kayahara; Natsumi Irie; Maiko Kofu; Yohei Kono; Toshiro Sakakibara; Yoji Horii; Takashi Kajiwara, 06 Feb. 2023, Scientific journal, 10.1021/acs.jpcc.2c08323
- Refereed, Journal of Materials Chemistry C, Royal Society of Chemistry (RSC), Construction of a two-dimensional metal–organic framework with perpendicular magnetic anisotropy composed of single-molecule magnets, Ikumi Aratani; Yoji Horii; Daisuke Takajo; Yoshinori Kotani; Hitoshi Osawa; Takashi Kajiwara, A robust network structure of single-molecule magnets that exhibits perpendicular magnetic anisotropy preferred for memory devices was constructed utilizing coordination chemistry at the air–liquid interface., 2023, 11, 6, 2082, 2088, Scientific journal, 10.1039/d2tc04963e
- Refereed, Scientific Reports, Springer Science and Business Media LLC, Rotating magnetocaloric effect in highly anisotropic TbIII and DyIII single molecular magnets, Piotr Konieczny; Dominik Czernia; Takashi Kajiwara, Abstract
The magnetocaloric effect (MCE) was investigated in highly anisotropic single crystals of two single molecule magnets (SMMs): [LnIII(ZnIIL)2]CF3SO3, where Ln = Tb, Dy and L = tripodal hexadentate Schiff base ligand. The structure of these paramagnetic compounds consists of identically oriented linear trinuclear clusters in a trigonal system with an easy direction c∥Zn–Ln–Zn array and a hard plane ab⊥Zn–Ln–Zn array. The magnitude of MCE measured for c∥H was significantly greater than MCE for ab∥H at a wide temperature range regardless of the studied SMM. Therefore, the rotating magnetocaloric effect (RMCE) was evaluated. The maxima of the magnetic entropy change for RMCE were obtained at 2.0 K and moderate fields: 3.9 J K−1 kg−1 at µ0H = 1.3 T for Ln = Tb and 3.3 J K−1 kg−1 at µ0H = 1.1 T for Ln = Dy. The relative efficiency of RMCE compared to the MCE measured in c∥H was as high as 99% at low magnetic fields., 05 Oct. 2022, 12, 1, Scientific journal, 10.1038/s41598-022-20893-2 - Inorganic Chemistry Frontiers, Royal Society of Chemistry (RSC), Solid polymorphism and dynamic magnetic properties of a dodecylated vanadyl–porphyrinato complex: spin–lattice relaxations modulated by phase stabilisation, Yoji Horii; Momo Makino; Taro Yamamoto; Shoichi Tatsumi; Hal Suzuki; Mariko Noguchi; Takefumi Yoshida; Takashi Kajiwara; Zhao-Yang Li; Masahiro Yamashita, Phase stabilisation elongates spin–lattice relaxation times., 2022, Scientific journal, 10.1039/d2qi01607a
- The Journal of Physical Chemistry C, American Chemical Society (ACS), Anisotropy of Spin–Lattice Relaxations in Mononuclear Tb3+ Single-Molecule Magnets, Piotr Konieczny; Robert Pel̷ka; Yuka Masuda; Shiomi Sakata; Saori Kayahara; Natsumi Irie; Takashi Kajiwara; Stanisl̷aw Baran, 09 Apr. 2020, 124, 14, 7930, 7937, Scientific journal, 10.1021/acs.jpcc.9b11057
- Not Refereed, サイエンス・オープンラボを通した化学（化学発光、金属イオンの色）学習 −大学生による演示実験を動機付けにした高等学校授業開発研究−, Takayuki Nakajima; Yuji Mikata; Takashi Kajiwara; Takae Takeuchi; Yasuyuki Ura; Hiroshi Takashima; Noriyuki Matsuura, Mar. 2020
- Refereed, Magnetochemistry, Correlation between Slow Magnetic Relaxations and Molecular Structures of Dy(III) Complexes with N5O4 Nona-Coordination, KAJIWARA Takashi; K. Kobayashi; Y. Harada; K. Ikenaga; Y. Kitagawa; M. Nakano; T. Kajiwara, Apr. 2019, 5, 2, 27, Scientific journal, 10.3390/magnetochemistry5020027
- Refereed, Angewandte Chemie - International Edition, Wiley-VCH Verlag, A Holmium(III)-Based Single-Molecule Magnet with Pentagonal-Bipyramidal Geometry, Takashi Kajiwara, 2017, 56, 38, 11306, 11308, Scientific journal, 10.1002/anie.201703022
- Refereed, INORGANIC CHEMISTRY, Light Lanthanide Complexes with Crown Ether and Its Aza Derivative Which Show Slow Magnetic Relaxation Behaviors, Hisami Wada; Sayaka Ooka; Tomoo Yamamura; Takashi Kajiwara, Jan. 2017, 56, 1, 147, 155, Scientific journal, 10.1021/acs.inorgchem.6b01764
- Refereed, Magnetochemistry, Slow Magnetic Relaxation of Lanthanide(III) Complexes with a Helical Ligand, KAJIWARA Takashi; Hisami Wada; Sayaka Ooka; Daichi Iwasawa; Miki Hasegawa; Takashi Kajiwara, Dec. 2016, 2, 43, 10.3390/magnetochemistry2040043
- Refereed, NATURE COMMUNICATIONS, One-dimensional Magnus-type platinum double salts, Christopher H. Hendon; Aron Walsh; Norinobu Akiyama; Yosuke Konno; Takashi Kajiwara; Tasuku Ito; Hiroshi Kitagawa; Ken Sakai, Jun. 2016, 7, 11950, Scientific journal, 10.1038/ncomms11950
- Refereed, DALTON TRANSACTIONS, Electron-rich linear triplatinum complexes stabilized by a spinning tetraphosphine, tris(diphenylphosphinomethyl)phosphine, Tomoaki Tanase; Kanako Koike; Miho Uegaki; Satoko Hatada; Kanako Nakamae; Bunsho Kure; Yasuyuki Ura; Takayuki Nakajima, 2016, 45, 17, 7209, 7214, Scientific journal, 10.1039/c6dt00624h
- Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 16aPS-55 Inelastic neutron scattering studies on Zn-Ln-Zn single-molecule magnets, Kofu M.; Kajiwara T.; Kikuchi T.; Ohira-Kawamura S.; Nakajima K.; Yamamuro O., 2015, 70, 760, 760, 10.11316/jpsgaiyo.70.2.0_760
- Refereed, DALTON TRANSACTIONS, Structural switching from paramagnetic to single-molecule magnet behaviour of LnZn(2) trinuclear complexes, Poh Ling Then; Chika Takehara; Yumiko Kataoka; Motohiro Nakano; Tomoo Yamamura; Takashi Kajiwara, 2015, 44, 41, 18038, 18048, Scientific journal, 10.1039/c5dt02965a
- Refereed, DALTON TRANSACTIONS, Slow magnetic relaxation of light lanthanide-based linear LnZn(2) trinuclear complexes, Chika Takehara; Poh Ling Then; Yumiko Kataoka; Motohiro Nakano; Tomoo Yamamura; Takashi Kajiwara, 2015, 44, 41, 18276, 18283, Scientific journal, 10.1039/c5dt03148f
- Refereed, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Tetranuclear Nickel and Cobalt Complexes with an Incomplete Double-Cubane Structure-Homo- and Heterometallic Complexes and Their 1D Coordination Polymers, Takayuki Nakajima; Keiko Seto; Andreas Scheurer; Bunsho Kure; Takashi Kajiwara; Tomoaki Tanase; Masahiro Mikuriya; Hiroshi Sakiyama, Oct. 2014, 29, 5021, 5033, Scientific journal, 10.1002/ejic.201402536
- Refereed, ORGANOMETALLICS, Electron-Deficient Pt2M2Pt2 Hexanuclear Metal Strings (M = Pt, Pd) Supported by Triphosphine Ligands, Eri Goto; Rowshan Ara Begum; Chiaki Ueno; Aya Hosokawa; Chie Yamamoto; Kanako Nakamae; Bunsho Kure; Takayuki Nakajima; Takashi Kajiwara; Tomoaki Tanase, Apr. 2014, 33, 8, 1893, 1904, Scientific journal, 10.1021/om401211d
- Refereed, CHEMICAL PHYSICS, Magnetic relaxations in a Tb-based single molecule magnet studied by quasielastic neutron scattering, Maiko Kofu; Takashi Kajiwara; Jason S. Gardner; Giovanna G. Simeoni; Madhusudan Tyagi; Antonio Faraone; Kenji Nakajima; Seiko Ohira-Kawamura; Motohiro Nakano; Osamu Yamamuro, Dec. 2013, 427, 147, 152, Scientific journal, 10.1016/j.chemphys.2013.10.004
- Refereed, CHEMISTRY LETTERS, SMM Behavior Observed in Ce(III)Zn(II)(2) Linear Trinuclear Complex, Shiori Hino; Moe Maeda; Yumiko Kataoka; Motohiro Nakano; Tomoo Yamamura; Takashi Kajiwara, Oct. 2013, 42, 10, 1276, 1278, Scientific journal, 10.1246/cl.130602
- Refereed, PHYSICAL REVIEW B, Hyperfine structure of magnetic excitations in a Tb-based single-molecule magnet studied by high-resolution neutron spectroscopy, M. Kofu; O. Yamamuro; T. Kajiwara; Y. Yoshimura; M. Nakano; K. Nakajima; S. Ohira-Kawamura; T. Kikuchi; Y. Inamura, Aug. 2013, 88, 6, 064405, Scientific journal, 10.1103/PhysRevB.88.064405
- Refereed, Dalton Transactions, Royal Society of Chemistry, A luminescent single-molecule magnet: Observation of magnetic anisotropy using emission as a probe, Kei Yamashita; Rie Miyazaki; Yumiko Kataoka; Takayuki Nakanishi; Yasuchika Hasegawa; Motohiro Nakano; Tomoo Yamamura; Takashi Kajiwara, 14 Feb. 2013, 42, 6, 1987, 1990, Scientific journal, 10.1039/c2dt32785f
- Refereed, DALTON TRANSACTIONS, Linear trinuclear Zn(II)-Ce(III)-Zn(II) complex which behaves as a single-molecule magnet, Shiori Hino; Moe Maeda; Kei Yamashita; Yumiko Kataoka; Motohiro Nakano; Tomoo Yamamura; Hiroyuki Nojiri; Maiko Kofu; Osamu Yamamuro; Takashi Kajiwara, 2013, 42, 8, 2683, 2686, Scientific journal, 10.1039/c2dt32812g
- Refereed, INORGANIC CHEMISTRY, Wheel-Shaped Icosanuclear Homo- and Heterometallic Complexes of Ni-II, Co-II, and Cu-II Ions Supported by Unsymmetrical Aminoalcohol Ligands, Takayuki Nakajima; Keiko Seto; Fumihiro Horikawa; Isao Shimizu; Andreas Scheurer; Bunsho Kure; Takashi Kajiwara; Tomoaki Tanase; Masahiro Mikuriya, Nov. 2012, 51, 22, 12503, 12510, Scientific journal, 10.1021/ic3019106
- Refereed, DALTON TRANSACTIONS, Correlation between slow magnetic relaxation and the coordination structures of a family of linear trinuclear Zn(II)-Ln(III)-Zn(II) complexes (Ln = Tb, Dy, Ho, Er, Tm and Yb), Moe Maeda; Shiori Hino; Kei Yamashita; Yumiko Kataoka; Motohiro Nakano; Tomoo Yamamura; Takashi Kajiwara, 2012, 41, 44, 13640, 13648, Scientific journal, 10.1039/c2dt31399e
- Refereed, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Systematic Expansion of Supercubane Cores in Manganese Oxo Clusters with Tricarboxylate Ligands, Yayoi Okui; Florina Aurelia Catusanu; Ryoko Kubota; Bunsho Kure; Takayuki Nakajima; Tomoaki Tanase; Takashi Kajiwara; Masahiro Mikuriya; Hitoshi Miyasaka; Masahiro Yamashita, Oct. 2011, 28, 4325, 4330, Scientific journal, 10.1002/ejic.201100781
- Refereed, CHEMISTRY-A EUROPEAN JOURNAL, Multi-Path Magnetic Relaxation of Mono-Dysprosium(III) Single-Molecule Magnet with Extremely High Barrier, Akiko Watanabe; Aika Yamashita; Motohiro Nakano; Tomoo Yamamura; Takashi Kajiwara, Jun. 2011, 17, 27, 7428, 7432, Scientific journal, 10.1002/chem.201003538
- Refereed, CHEMISTRY-A EUROPEAN JOURNAL, Magnetic Relaxation of Single-Molecule Magnets in an External Magnetic Field: An Ising Dimer of a Terbium(III)-Phthalocyaninate Triple-Decker Complex, Keiichi Katoh; Takashi Kajiwara; Motohiro Nakano; Yasuhiro Nakazawa; Wolfgang Wernsdorfer; Naoto Ishikawa; Brian K. Breedlove; Masahiro Yamashita, 2011, 17, 1, 117, 122, Scientific journal, 10.1002/chem.201002026
- Refereed, CHEMISTRY-A EUROPEAN JOURNAL, Structural Design of Easy-Axis Magnetic Anisotropy and Determination of Anisotropic Parameters of Ln(III)-Cu-II Single-Molecule Magnets, Takashi Kajiwara; Motohiro Nakano; Kohei Takahashi; Shinya Takaishi; Masahiro Yamashita, 2011, 17, 1, 196, 205, Scientific journal, 10.1002/chem.201002434
- Refereed, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Wheel-Shaped (ErZn3II)-Zn-III Single-Molecule Magnet: A Macrocyclic Approach to Designing Magnetic Anisotropy, Aika Yamashita; Akiko Watanabe; Shigehisa Akine; Tatsuya Nabeshima; Motohiro Nakano; Tomoo Yamamura; Takashi Kajiwara, 2011, 50, 17, 4016, 4019, Scientific journal, 10.1002/anie.201008180
- Refereed, DALTON TRANSACTIONS, Real time and space observation of domain wall migration in a MX-chain complex with a quasi-2D CDW state by using STM, Shinya Takaishi; Hashen Wu; Takashi Kajiwara; Brian K. Breedlove; Hitoshi Miyasaka; Masahiro Yamashita, 2011, 40, 10, 2160, 2162, Scientific journal, 10.1039/c0dt01051k
- Refereed, CRYSTENGCOMM, Metal-organic frameworks with rare topologies: lonsdaleite-type metal formates and their magnetic properties, Hyunuk Kim; Yinyong Sun; Yonghwi Kim; Takashi Kajiwara; Masahiro Yamashita; Kimoon Kim, 2011, 13, 7, 2197, 2200, Scientific journal, 10.1039/c1ce05031a
- Refereed, Journal of Physics: Conference Series, Magnetic properties of lanthanoid(III) phthalocyaninato triple-decker complexes in an external magnetic field and electronic transport properties for molecular spintronics, K. Katoh; K. Yamamoto; T. Kajiwara; J. Takeya; B. K. Breedlove; M. Yamashita, 2011, 303, 1, 012035-012044, International conference proceedings, 10.1088/1742-6596/303/1/012035
- Refereed, DALTON TRANSACTIONS, Non-oxo 5-coordinate and 6-coordinate vanadium(IV) complexes with their precursor [LVIII(CH3OH)](0), where L = a trianionic aminetris(phenolate)-[N,O,O,O] donor ligand: a magnetostructural and EPR study, Takashi Kajiwara; Rita Wagner; Eckhard Bill; Thomas Weyhermueller; Phalguni Chaudhuri, 2011, 40, 47, 12719, 12726, Scientific journal, 10.1039/c1dt11277e
- Refereed, INORGANIC CHEMISTRY, Single-Chain Magnets Constructed by Using the Strict Orthogonality of Easy-Planes: Use of Structural Flexibility to Control the Magnetic Properties, Takashi Kajiwara; Hiroki Tanaka; Motohiro Nakano; Shinya Takaishi; Yasuhiro Nakazawa; Masahiro Yamashita, Sep. 2010, 49, 18, 8358, 8370, Scientific journal, 10.1021/ic100843k
- Refereed, INORGANIC CHEMISTRY, Structural Study of Electronic States in Quasi-One-Dimensional Halogen-Bridged Mixed-Metal Complexes [Ni1-xPdx(chxn)(2)Br]Br-2, Shinya Takaishi; Hashen Wu; Jimin Xie; Takashi Kajiwara; Brian K. Breedlove; Hitoshi Miyasaka; Masahiro Yamashita, Apr. 2010, 49, 8, 3694, 3696, Scientific journal, 10.1021/ic1001368
- Refereed, INORGANIC CHEMISTRY, Syntheses, Structures, and Magnetic Properties of Tetramanganese(III) and Hexamanganese(III) Complexes Containing Derivative of Biguanidate Ligand: Ferromagnetic Interaction via Imino Nitrogen, Asako Igashira-Kamiyama; Takashi Kajiwara; Motohiro Nakano; Takumi Konno; Tasuku Ito, Dec. 2009, 48, 23, 11388, 11393, Scientific journal, 10.1021/ic901219f
- Refereed, INORGANIC CHEMISTRY, Electroconductive Porous Coordination Polymer Cu[Cu(pdt)(2)] Composed of Donor and Acceptor Building Units, Shinya Takaishi; Miyuki Hosoda; Takashi Kajiwara; Hitoshi Miyasaka; Masahiro Yamashita; Yasuyuki Nakanishi; Yasutaka Kitagawa; Kizashi Yamaguchi; Atsushi Kobayashi; Hiroshi Kitagawa, Oct. 2009, 48, 19, 9048, 9050, Scientific journal, 10.1021/ic802117q
- Refereed, JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY, One-step heterogeneous assembly of terbium(III) and silver(I) with thiacalix[4]arene ligands to form a cage including terbium(III) in an octa-oxygen cube, Teppei Tanaka; Nobuhiko Iki; Takashi Kajiwara; Masahiro Yamashita; Hitoshi Hoshino, Aug. 2009, 64, 3-4, 379, 383, Scientific journal, 10.1007/s10847-009-9567-0
- Refereed, INORGANIC CHEMISTRY, Effect of an In-Plane Ligand on the Electronic Structures of Bromo-Bridged Nano-Wire Ni-Pd Mixed-Metal Complexes, [Ni1-xPdx(bn)(2)Br]Br-2 (bn=2S,3S-Diaminobutane), Mari Sasaki; Hashen Wu; Daisuke Kawakami; Shinya Takaishi; Takashi Kajiwara; Hitoshi Miyasaka; Brian K. Breedlove; Masahiro Yamashita; Hideo Kishida; Hiroyuki Matsuzaki; Hiroshi Okamoto; Hisaaki Tanaka; Shinichi Kuroda, Aug. 2009, 48, 15, 7446, 7451, Scientific journal, 10.1021/ic901067z
- Refereed, JOURNAL OF PHYSICAL CHEMISTRY C, A Low-Temperature Scanning Tunneling Microscope Investigation of a Nonplanar Dysprosium-Phthalocyanine Adsorption on Au(111), Yan-Feng Zhang; Hironari Isshiki; Keiichi Katoh; Yusuke Yoshida; Masahiro Yamashita; Hitoshi Miyasaka; Brian K. Breedlove; Takashi Kajiwara; Shinya Takaishi; Tadahiro Komeda, Aug. 2009, 113, 32, 14407, 14410, Scientific journal, 10.1021/jp9045935
- Refereed, Journal of the American Chemical Society, Direct observation of lanthanide(III)-phthalocyanine molecules on Au(111) by using scanning tunneling microscopy and scanning tunneling spectroscopy and thin-film field-effect transistor properties of Tb(III)- and Dy(III)-phthalocyanine molecules, Keiichi Katoh; Yusuke Yoshida; Masahiro Yamashita; Hitoshi Miyasaka; Brian K. Breedlove; Takashi Kajiwara; Shinya Takaishi; Naoto Ishikawa; Hironari Isshiki; Feng Zhang Yan; Tadahiro Komeda; Masakazu Yamagishi; Jun Takeya, 29 Jul. 2009, 131, 29, 9967, 9976, Scientific journal, 10.1021/ja902349t
- Refereed, POLYHEDRON, Coordination enhancement of single-molecule magnet behavior of Tb(III)-Cu(II) dinuclear systems, Takashi Kajiwara; Kohei Takahashi; Tomonari Hiraizumi; Shinya Takaishi; Masahiro Yamashita, Jun. 2009, 28, 9-10, 1860, 1863, Scientific journal, 10.1016/j.poly.2009.02.010
- Refereed, JOURNAL OF PHYSICAL CHEMISTRY C, Low-Temperature Scanning Tunneling Microscopy Investigation of Bis(phthalocyaninato)yttrium Growth on Au(111): From Individual Molecules to Two-Dimensional Domains, Yan Feng Zhang; Hironari Isshiki; Keiichi Katoh; Yusuke Yoshida; Masahiro Yamashita; Hitoshi Miyasaka; Brian K. Breedlove; Takashi Kajiwara; Shinya Takaishi; Tadahiro Komeda, Jun. 2009, 113, 22, 9826, 9830, Scientific journal, 10.1021/jp902410q
- Refereed, SOLID STATE SCIENCES, Magnetic anisotropy and molecular assembling in d complex cation-f complex anion type coordination compounds, Marilena Ferbinteanu; Fanica Cimpoesu; Takashi Kajiwara; Masahiro Yamashita, Apr. 2009, 11, 4, 760, 765, Scientific journal, 10.1016/j.solidstatesciences.2008.06.008
- Refereed, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, Structures and Magnetic Properties of Dinuclear Copper(II) Complexes Containing a Bulky Diamine Ligand, 1,2-Dipiperidinoethane, Machiko Arakawa-Itoh; Kana Tokuman; Yukie Mori; Takashi Kajiwara; Masahiro Yamashita; Yutaka Fukuda, Mar. 2009, 82, 3, 358, 363, Scientific journal, 10.1246/bcsj.82.358
- Refereed, JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS, Direct Synthesis and Crystal Structure of Dehydrated State in Vapochromic MMX-type Quasi-One-Dimensional Iodide-Bridged Platinum Complexes, Hiroaki Iguchi; Shinya Takaishi; Takashi Kajiwara; Hitoshi Miyasaka; Masahiro Yamashita; Hiroyuki Matsuzaki; Hiroshi Okamoto, Mar. 2009, 19, 1, 85, 90, Scientific journal, 10.1007/s10904-008-9242-8
- Not Refereed, 25TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT25), PART 4, Single-Crystal Growth of Pb2V3O9 and the Bose-Einstein Condensed State of Triplons Studied by Thermal Conductivity, Specific Heat and Magnetization Measurements, T. Kawamata; N. Sugawara; M. Uesaka; N. Kaneko; T. Kajiwara; H. Yamane; K. Koyama; K. Kudo; N. Kobayashi; Y. Koike, 2009, 150, International conference proceedings, 10.1088/1742-6596/150/4/042087
- Journal of the Ceramic Society of Japan, The Ceramic Society of Japan, Synthesis, crystal structure and physical properties of layered cobalt oxide Ca_xCoO_2 (x〜0.47), MIYAZAKI Yuzuru; HUANG Xiangyang; KAJIWARA Takashi; YAMANE Hisanori; KAJITANI Tsuyoshi, We have synthesized a single-phase sample of the compound known as CaCo_2O_4 and investigated its crystal structure by means of a single crystal X-ray diffraction technique. The compound crystallizes in a triclinic system (space group P1) with lattice parameters of a=492.4(2)pm, b=568.3(3)pm, c=568.5(3)pm, α=75.400(9)°, β=89.974(9)° and γ=81.261(9)° at 293(2)K. The structure consists of an alternate stack of a CdI_2-type CoO_2 triangular sheet and a layer of Ca atoms, showing great similarity to that of β-Na_xCoO_2 (x〜0.67). However, the Ca atom has four crystallographic sites with different occupation probabilities, leading to the structure formula Ca_<1.87(5)>Co_4O_8 (Ca_<0.47(1)>CoO_2). Due to a low bulk density as well as a small number of hole carriers, equivalent to the nominal valence state of Co ions close to 3.06, a polycrystalline sample of the Caphase exhibits much higher electrical resistivity ρ=680μΩm, relative to that of the Na-phase ρ=1.2μΩm, with a large positive Seebeck coefficient of S=145μV/K at 300K., 01 Jan. 2009, 117, 1361, 42, 46, 10.2109/jcersj2.117.42
- Refereed, CRYSTENGCOMM, Structural correlations between the crystal field and magnetic anisotropy of Ln-Cu single-molecule magnets, Takashi Kajiwara; Kohei Takahashi; Tomonari Hiraizumi; Shinya Takaishi; Masahiro Yamashita, 2009, 11, 10, 2110, 2116, Scientific journal, 10.1039/b906182g
- Refereed, Dec. 2008, 130, 17668-17669, 10.1021/ja807901p
- Refereed, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Highly Luminescent Superparamagnetic Diterbium(III) Complex Based on the Bifunctionality of p-tert-Butylsulfonylcalix[4]arene, Takashi Kajiwara; Miki Hasegawa; Ayumi Ishii; Kensuke Katagiri; Munkhtsetseg Baatar; Shinya Takaishi; Nobuhiko Iki; Masahiro Yamashita, Dec. 2008, 36, 5565, 5568, Scientific journal, 10.1002/ejic.200800706
- Not Refereed, PURE AND APPLIED CHEMISTRY, Single-chain magnets constructed with a twisting arrangement of the easy-plane of iron(II) ions, Takashi Kajiwara; Hiroki Tanaka; Masahiro Yamashita, Nov. 2008, 80, 11, 2297, 2308, Scientific journal, 10.1351/pac200880112297
- Refereed, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Charge-density-wave to Mott-Hubbard phase transition in quasi-one-dimensional bromo-bridged Pd compounds, Shinya Takaishi; Mitsuhito Takamura; Takashi Kajiwara; Hitoshi Miyasaka; Masahiro Yamashita; Muneaki Lwata; Hiroyuki Matsuzaki; Hiroshi Okamoto; Hisaaki Tanaka; Shin-ichi Kuroda; Hiroyuki Nishikawa; Hiroki Oshio; Kenichi Kato; Masaki Takata, Sep. 2008, 130, 36, 12080, 12084, Scientific journal, 10.1021/ja8032026
- Refereed, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Three-dimensionally ordered CDW state in quasi-one-dimensional iodo-bridged dinuclear platinum mixed-valence compounds, A(4)[Pt2I(POP)(4)]center dot nH(2)O (A = aromatic ammonium cations), Satoshi Matsunaga; Kouichi Takizawa; Daisuke Kawakami; Hiroaki Iguchi; Shinya Takaishi; Takashi Kajiwara; Hitoshi Miyasaka; Masahiro Yamashita; Hiroyuki Matsuzaki; Hiroshi Okamoto, Jul. 2008, 21, 3269, 3273, Scientific journal, 10.1002/ejic.200701276
- Refereed, CHEMISTRY LETTERS, Synthesis of a sulfur-bridged diphosphine ligand and its unique complexation properties toward palladium(II) ion, Naoya Morohashi; Yuki Akahira; Shinya Tanaka; Kensuke Nishiyama; Takashi Kajiwara; Tetsutaro Hattori, Apr. 2008, 37, 4, 418, 419, Scientific journal, 10.1246/cl.2008.418
- Refereed, Inorg. Chem., Coordination-Tuned Single-Molecule-Magnet Behavior of Tb(III)-Cu(II) Dinuclear Systems, KAJIWARA Takashi; T. Kajiwara; M. Nakano; S. Takaishi; M. Yamashita, 2008, 47, 8604 - 8606
- Refereed, Inorg. Chim. Acta, Hybridized complexes of [MnIII2] single-molecule magnets and Ni dithiolate complexes, KAJIWARA Takashi; H. Hiraga; H. Miyasaka; S. Takaishi; T. Kajiwara; M. Yamashita, 2008, 361, 3863-3273
- Refereed, INORGANIC CHEMISTRY, Hybrid molecular material exhibiting single-molecule magnet behavior and molecular conductivity, Hiroki Hiraga; Hitoshi Miyasaka; Kazuya Nakata; Takashi Kajiwara; Shinya Takaishi; Yugo Oshima; Hiroyuki Nojiri; Masahiro Yamashita, Nov. 2007, 46, 23, 9661, 9671, Scientific journal, 10.1021/ic700727n
- Refereed, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Direct observation of the ground-spin alignment of Fe(II)-Fe(III) single-chain magnet by muon-spin relaxation, Takashi Kajiwara; Isao Watanabe; Yukihiro Kaneko; Shinya Takaishi; Masaya Enomoto; Norimichi Kojima; Masahiro Yamashita, Oct. 2007, 129, 41, 12360, +, Scientific journal, 10.1021/ja0741877
- Refereed, INORGANIC CHEMISTRY, Why does the disorder of R-pn and rac-pn ligands in the quasi-one-dimensional bromo-bridged Ni-III complexes, [Ni(pn)(2)Br]Br-2 (pn=1,2-diaminopropane) afford similar STM patterns?, Hashen Wu; Daisuke Kawakami; Mari Sasaki; Jimin Xie; Shinya Takaishi; Takashi Kajiwara; Hitoshi Miyasaka; Masahiro Yamashita; Hiroyuki Matsuzaki; Hiroshi Okamoto, Sep. 2007, 46, 18, 7410, 7413, Scientific journal, 10.1021/ic700379m
- Refereed, COORDINATION CHEMISTRY REVIEWS, Transition metal and lanthanide cluster complexes constructed with thiacalix[n]arene and its derivatives, Takashi Kajiwara; Nobuhiko Iki; Masahiro Yamashita, Jul. 2007, 251, 13-14, 1734, 1746, Scientific journal, 10.1016/j.ccr.2007.01.001
- Refereed, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Metal-insulator transition of charge-transfer salts based on unsymmetrical donor DMET and metal halide anions (DMET)(4)(MCl4)(TCE)(2) (M = Mn, Co, Cu, Zn; TCE=1,1,2-trichloroethane), Hiroshi Ito; Daichi Suzuki; Harutaka Watanabe; Hisaaki Tanaka; Shin-ichi Kuroda; Masamichi Umemiya; Norihito Kobayashi; Makoto Goto; Ken-ichi Sugiura; Hitoshi Miyasaka; Shinya Takaishi; Takashi Kajiwara; Masahiro Yamashita; Eiji Ohmichi; Toshihito Osada, Jul. 2007, 129, 27, 8510, 8518, Scientific journal, 10.1021/ja070672q
- Refereed, POLYHEDRON, Synthesis, structure, and magnetic property of a new Fe(II)-Fe(III) alternating single-chain magnet constructed with a methyl-substituted bpca(-) ligand, Hiroki Tanaka; Takashi Kajiwara; Yukihiro Kaneko; Shinya Takaishi; Masahiro Yamashita, Jun. 2007, 26, 9-11, 2105, 2109, Scientific journal, 10.1016/j.poly.2006.10.015
- Refereed, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, Tetra- and di-nuclear copper(II) complexes with stereoisomers of sulfinylcalix[4]arene arising from the disposition of four S=O groups, Nobuhiko Iki; Yusuke Yamane; Naoya Morohashi; Takashi Kajiwara; Tasuku Ito; Sotaro Miyano, Jun. 2007, 80, 6, 1132, 1139, Scientific journal, 10.1246/bcsj.80.1132
- Refereed, POLYHEDRON, The magnetic anisotropy and assembling of the lanthanide coordination units in [Fe(bpca)(2)][Er(NO3)(3)(H2O)(4)]NO3, Marilena Ferbinteanu; Takashi Kajiwara; Fanica Cimpoesu; Kensuke Katagiri; Masahiro Yamashita, Jun. 2007, 26, 9-11, 2069, 2073, Scientific journal, 10.1016/j.poly.2006.10.003
- Refereed, INORGANIC CHEMISTRY, Spin coupling in the supramolecular structure of a new tetra(quinoline-TEMPO)yttrium(III) complex, Luca Maretti; Marilena Ferbinteanu; Fanica Cimpoesu; Saiful S. M. Islam; Yasunori Ohba; Takashi Kajiwara; Masahiro Yamashita; Seigo Yamauchi, Feb. 2007, 46, 3, 660, 669, Scientific journal, 10.1021/ic0610841
- Refereed, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, Tuning of electronic structures of quasi-one-dimensional bromo-bridged Pd-II-Pd-IV mixed-valence complexes by substituting counter anions, Hisamitsu Arakawa; Daisuke Kawakami; Shinya Takaishi; Takashi Kajiwara; Hitoshi Miyasaka; Ken-ichi Sugiura; Masahiro Yamashita; Hideo Kishida; Hiroshi Okamoto, Jan. 2007, 80, 1, 189, 191, Scientific journal, 10.1246/bcsj.80.189
- Refereed, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, A nickel(II) gold(I) D-penicillaminate coordination system with multiple switching in color, magnetism, and chirality, Mai Taguchi; Asako Igashira-Kamiyama; Takashi Kajiwara; Takumi Konno, 2007, 46, 14, 2422, 2425, Scientific journal, 10.1002/anie.200604728
- Refereed, CHEMISTRY-AN ASIAN JOURNAL, A dodecalanthanide wheel supported by p-tert-butylsulfonylcalix[4]aren, Takashi Kajiwara; Kensuke Katagiri; Shinya Takaishi; Masahiro Yamashita; Nobuhiko Iki, Sep. 2006, 1, 3, 349, 351, Scientific journal, 10.1002/asia.200600057
- Refereed, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, Versatile vapochromic behavior accompanied by a phase change between charge-polarization state and charge-density-wave state in a quasi-one-dimensional iodo-bridged dinuclear platinum mixed-valence compound, [{NH3(CH2)(5)NH3}(2)]-[Pt-2(pop)4I]center dot 4H(2)O, Masahiro Yamashita; Kouichi Takizawa; Satoshi Matsunaga; Daisuke Kawakami; Hiroaki Iguchi; Shinya Takaishi; Takashi Kajiwara; Fumiyasu Iwahori; Tomohiko Ishii; Hitoshi Miyasaka; Ken-ichi Sugiura; Hiroyuki Matsuzaki; Hideo Kishida; Hiroshi Okamoto, Sep. 2006, 79, 9, 1404, 1406, Scientific journal, 10.1246/besj.79.1404
- Refereed, INORGANIC CHEMISTRY, Ferromagnetic coupling promoted by k(3)N : k(2)N bridging system, Asako Igashira-Kamiyama; Takashi Kajiwara; Takumi Konno; Tasuku Ito, Aug. 2006, 45, 16, 6460, 6466, Scientific journal, 10.1021/ic0520925
- Refereed, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, A binuclear Fe(III)Dy(III) single molecule magnet. Quantum effects and models, Marilena Ferbinteanu; Takashi Kajiwara; Kwang-Yong Choi; Hiroyuki Nojiri; Akio Nakamoto; Norimichi Kojima; Fanica Cimpoesu; Yuichi Fujimura; Shinya Takaishi; Masahiro Yamashita, Jul. 2006, 128, 28, 9008, 9009, Scientific journal, 10.1021/ja062399i
- Refereed, INORGANIC CHEMISTRY, Conformation-controlled luminescent properties of lanthanide clusters containing p-tert-butylsulfonylcalix[4]arene, T Kajiwara; K Katagiri; M Hasegawa; A Ishii; M Ferbinteanu; S Takaishi; T Ito; M Yamashita; N Iki, Jun. 2006, 45, 13, 4880, 4882, Scientific journal, 10.1021/ic060397t
- Refereed, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Highly symmetrical tetranuclear cluster complexes supported by p-tert-butylsulfonylcalix[4]arene as a cluster-forming ligand, T Kajiwara; T Kobashi; R Shinagawa; T Ito; S Takaishi; M Yamashita; N Iki, May 2006, 9, 1765, 1770, Scientific journal, 10.1002/ejic.200501086
- Refereed, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Dynamical valence fluctuation at the charge-density-wave phase boundary in iodide-bridged Pt compound [Pt(chxn)(2)I]I-2, Shinya Takaishi; Daisuke Kawakami; Masahiro Yamashita; Mari Sasaki; Takashi Kajiwara; Hitoshi Miyasaka; Ken-ichi Sugiura; Yusuke Wakabayashi; Hiroshi Sawa; Hiroyuki Matsuzaki; Hideo Kishida; Hiroshi Okamoto; Harutaka Watanabe; Hisaaki Tanaka; Kazuhiro Marumoto; Hiroshi Ito; Shin-ichi Kuroda, May 2006, 128, 19, 6420, 6425, Scientific journal, 10.1021/ja060193b
- Refereed, Angew. Chem. Int. Ed.,, Halogen-Bridged Two-Leg Ladder PtII-PtIV Mixed-Valence Complexes: Syntheses, Structures and Optical, M. Yamashita; D. Kawakami; S. Matsunaga; S. Takaishi; T. Kajiwara; H. Miyasaka; K. Sugiura; H. Matsuzaki; H. Kishida; H. Okamoto; Y. Wakabayashi; H. Sawa, Apr. 2006, 45, 7214, 7217, Scientific journal
- Refereed, CHEMISTRY LETTERS, Topological variation between hexa- and trithiacalix[6]arene-copper(II) complexes: From sphere to wheel by reducing the number of the sulfur bridges, Noriyoshi Kon; Nobuhiko Iki; Takashi Kajiwara; Tasuku Ito; Sotaro Miyano, Apr. 2006, 35, 4, 430, 431, Scientific journal, 10.1246/cl.2006.430
- Refereed, CHEMISTRY LETTERS, New charge-transfer salts based on unsymmetrical donor DMET and metal complex anions: (DMET)(3)[Cr(isoq)(2)(NCS)(4)] and (DMET)(3)[Cr(phen)(NCS)(4)]center dot CH3CN, Masamichi Umemiya; Makoto Goto; Norihito Kobayashi; Shinya Takaishi; Takashi Kajiwara; Masahiro Yamashita; Hitoshi Miyasaka; Ken-ichi Sugiura; Harutaka Watanabe; Daichi Suzuki; Hiroshi Ito; Shin-ichi Kuroda, Apr. 2006, 35, 4, 368, 369, Scientific journal, 10.1246/cl.2006.368
- Refereed, JOURNAL OF SOLID STATE CHEMISTRY, Synthesis and crystal structures of CaY2Ge3O10 and CaY2Ge4O12, H Yamane; R Tanimura; T Yamada; J Takahashi; T Kajiwara; M Shimada, Jan. 2006, 179, 1, 289, 295, Scientific journal, 10.1016/j.jssc.2005.10.023
- Refereed, Bull. Chem. Soc. Jpn.,, Versatile Vapochromic Behavior Accompanied by Phase Change between Charge-Polarization State and, M. Yamashita; K. Takizawa; S. Matsunaga; D. Kawakami; H. Iguchi; S. Takaishi; T.,Kajiwara; F. Iwahori; T. Ishii; H. Miyasaka; K. Sugiura; H. Matsuzaki; H. Kishida; H. Okamoto, 2006, 79, 1404, 1406, Scientific journal, 10.1246/bcsj.79.1404
- Refereed, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Halogen-bridged Pt-II/Pt-IV mixed-valence ladder compounds, Daisuke Kawakami; Masahiro Yamashita; Satoshi Matsunaga; Shinya Takaishi; Takashi Kajiwara; Hitoshi Miyasaka; Ken-ichi Sugiura; Hiroyuki Matsuzaki; Hiroshi Okamoto; Yusuke Wakabayashi; Hiroshi Sawa, 2006, 45, 43, 7214, 7217, Scientific journal, 10.1002/anie.200602987
- Refereed, INORGANIC CHEMISTRY, Novel excited quintet state in porphyrin: Bis(quinoline-TEMPO)-yttrium-tetraphenylporphine complex, L Maretti; SSM Islam; Y Ohba; T Kajiwara; S Yamauchi, Dec. 2005, 44, 25, 9125, 9127, Scientific journal, 10.1021/ic0511827
- Refereed, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, A single-chain magnet formed by a twisted arrangement of ions with easy-plane magnetic anisotropy, T Kajiwara; M Nakano; Y Kaneko; S Takaishi; T Ito; M Yamashita; A Igashira-Kamiyama; H Nojiri; Y Ono; N Kojima, Jul. 2005, 127, 29, 10150, 10151, Scientific journal, 10.1021/ja052653r
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, Ba19In9, a subnitride containing isolated [In-5](5-) and [In-8](12-) Zintl anions, H Yamane; S Sasaki; T Kajiwara; T Yamada; M Shimada, Oct. 2004, 60, I120, I123, Scientific journal, 10.1107/S160053680402224X
- Refereed, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 1,3,5-triazapentanediene, a novel tridentate ligand that bridges two metal ions in kappa N-1 :kappa N-2 bridging mode with C-2 symmetry, T Kajiwara; T Ito, Aug. 2004, 15, 3084, 3088, Scientific journal, 10.1002/ejic.200400122
- Refereed, CHEMISTRY LETTERS, A p-tert-butyldithiacalix[4]arene-copper(II) complex having double-cone shape of unique heteroditopic inclusion behavior, N Kon; N Iki; T Kajiwara; T Ito; S Miyano, Aug. 2004, 33, 8, 1046, 1047, Scientific journal
- Refereed, Mater. Res. Bull., Single crystal growth of Mn2N using an In-Na flux, M. Aoki; H. Yamane; M. Shimada; T. Kajiwara, 05 May 2004, 39, 6, 827, 832, Scientific journal, 10.1016/j.materresbull.2004.02.014
- Refereed, JOURNAL OF ALLOYS AND COMPOUNDS, Single crystal growth of manganese gallium nitride using Mn-Ga-Na melt, M Aoki; H Yamane; M Shimada; T Kajiwara, Feb. 2004, 364, 1-2, 280, 282, Scientific journal, 10.1016/S0925-8388(03)00506-1
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, Bis[tris(2,2 '-bipyridine-kappa N-2,N ')ruthenium(II)] hexacyanoferrate(III) chloride octahydrate, K Sakai; Y Uchida; T Kajiwara; T Ito, Feb. 2004, 60, M65, M68, Scientific journal, 10.1107/S0108270103028841
- Refereed, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Octalanthanide wheels supported by p-tert-butylsulfonylcalix[4]arene, T Kajiwara; HS Wu; T Ito; N Iki; S Miyano, 2004, 43, 14, 1832, 1835, Scientific journal, 10.1022/anie.200353449
- Refereed, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, p-tert-Butylthiacalix[6]arene as a clustering ligand. Syntheses and structures of Co-5(II), Ni-4(II), and mixed-metal (MNi4II)-Ni-II (M = Mn, Co, and Cu) cluster complexes, and a novel metal-induced cluster core rearrangement, T Kajiwara; R Shinagawa; T Ito; N Kon; N Iki; S Miyano, Dec. 2003, 76, 12, 2267, 2275, Scientific journal, 10.1246/bcsJ.76.2267
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, A ferroelectric barium titanate, BaTi2O5, T Kimura; T Goto; H Yamane; H Iwata; T Kajiwara; T Akashi, Dec. 2003, 59, I128, I130, Scientific journal, 10.1107/S0108270103021395
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, Di-mu-pivalato-bis[cis-diammineplatinum(II)] bis(perchlorate) pivalic acid solvate, K Sakai; E Ishigami; K Yokokawa; T Kajiwara; T Ito, Dec. 2003, 59, M1178, M1180, Scientific journal, 10.1107/S1600536803026503
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, A head-to-tail isomer of bis[mu-2-(N '-methyl-4,4 '-bipyridinium-1-yl)acetamidato]bis[cis-diammineplatinum(II)] hexaperchlorate dihydrate, K Sakai; Y Ikuta; T Tsubomura; K Kato; Y Yokoyama; T Kajiwara; T Ito, Sep. 2003, 59, M780, M783, Scientific journal, 10.1107/S1600536803017756
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, A head-to-head isomer of di-mu-pivalamidato-kappa N-4,O-bis[ (1,10-phenanthroline-kappa N-2,N ')platinum(II)] dinitrate dihydrate, K Sakai; M Kurashima; N Akiyama; N Satoh; T Kajiwara; T Ito, Sep. 2003, 59, M345, M349, Scientific journal, 10.1107/S0108270103015920
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, A head-to-head isomer of bis(mu-N-methylisonicotinamidato)bis[cis-diammineplatinum(II)] tetraperchlorate, K Sakai; M Shiomi; T Tsubomura; K Kato; Y Yokoyama; T Kajiwara; T Ito, Aug. 2003, 59, M559, M561, Scientific journal, 10.1107/S1600536803014521
- Refereed, POLYHEDRON, Ferromagnetic interactions through control of the bridging geometry, T Kajiwara; A Kamiyama; T Ito, Jul. 2003, 22, 14-17, 1789, 1793, Scientific journal, 10.1016/S0277-5387(03)00169-4
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, A head-to-head isomer of di-mu-alpha-pyrrolidinonato-bis[cis-diammine-bromoplatinum(III)] dinitrate, K Sakai; T Sakamoto; T Kajiwara; T Ito, Jul. 2003, 59, M553, M555, Scientific journal, 10.1107/S1600536803014405
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, Di-mu-pivalato-bis[cis-diammineplatinum(II)] sulfate monohydrate, K Sakai; E Ishigami; K Yokokawa; T Kajiwara; T Ito, Jul. 2003, 59, M443, M445, Scientific journal, 10.1107/S1600536803012224
- Refereed, CRYSTENGCOMM, Controlling the construction of trinuclear, 1-D, and 2-D Ni(II)Fe(II)/Fe(II)Fe(II) complexes: selective syntheses, structures, and magnetic properties, A Kamiyama; T Noguchi; T Kajiwara; T Ito, Jun. 2003, 5, 231, 237, Scientific journal, 10.1039/b302413j
- Refereed, JOURNAL OF SOLID STATE CHEMISTRY, Synthesis and crystal structure analysis of Sr8Cu3In4N5 and Sr0.53Ba0.47CuN, H Yamane; S Sasaki; S Kubota; M Shimada; T Kajiwara, Feb. 2003, 170, 2, 265, 272, Scientific journal, 10.1016/S0022-4596(02)00083-X
- Refereed, JOURNAL OF CRYSTAL GROWTH, CrN single-crystal growth using Cr-Ga-Na ternary melt, M Aoki; H Yamane; M Shimada; T Kajiwara, Dec. 2002, 246, 1-2, 133, 138, Scientific journal
- Refereed, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, New partially oxidized 1-D platinum chain complexes consisting of carboxylate-bridged cis-diammineplatinum dimer cations, K Sakai; E Ishigami; Y Konno; T Kajiwara; T Ito, Oct. 2002, 124, 41, 12088, 12089, Scientific journal, 10.1021/ja0275461
- Refereed, CHEMISTRY LETTERS, Cage-type hexacopper(II) complex formed by chloride template, A Kamiyama; T Kajiwara; T Ito, Oct. 2002, 10, 980, 981, Scientific journal
- Refereed, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Synthesis, structure, and ferromagnetic behavior of decacopper(II) cluster complex supported by hexaanionic p-tert-butylthiacalix[6]arene, T Kajiwara; N Kon; S Yokozawa; T Ito; N Iki; S Miyano, Sep. 2002, 124, 38, 11274, 11275, Scientific journal, 10.1021/ja0273391
- Refereed, INORGANICA CHIMICA ACTA, Syntheses, structures, and magnetic properties of multinuclear complexes constructed with complexed ligands, [M(bpca)(2)](+) (M = Cr(III), Fe(III), Co(III); Hbpca = bis(2-pyridylcarbonyl)amine), T Kajiwara; R Sensui; T Noguchi; A Kamiyama; T Ito, Sep. 2002, 337, 299, 307, Scientific journal
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, Ba14Cu2In4N7, a new subnitride with isolated nitridocuprate groups and indium clusters, H Yamane; S Sasaki; S Kubota; T Kajiwara; M Shimada, Apr. 2002, 58, I50, I52, Scientific journal, 10.1107/S010827010200361X
- Refereed, INORGANIC CHEMISTRY, Syntheses, structures, and properties of trinuclear complexes [M(bpca)(2){M '(hfaC)(2)}(2)], constructed with the complexed bridging ligand [M(bpca)(2)] [M, M ' = Ni(II), Mn(II); Cu(II), Mn(II); Fe(II), Mn(II); Ni(II), Fe(II); and Fe(II), Fe(II); hbpca = bis(2-pyridylcarbonyl)amine, hhfac = hexafluoroacetylacetone], A Kamiyama; T Noguchi; T Kajiwara; T Ito, Feb. 2002, 41, 3, 507, 512, Scientific journal, 10.1021/ic010731f
- Refereed, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Zinc(III) slides on a ligand surface: The X-ray crystal structure and dynamic behavior in solution of [Zn(H2L)(tacn)], T Kajiwara; S Yokozawa; T Ito; N Iki; N Morohashi; S Miyano, 2002, 41, 12, 2076, 2078, Scientific journal
- Refereed, CRYSTAL GROWTH & DESIGN, Morphology and polarity of GaN single crystals synthesized by the Na flux method, M Aoki; H Yamane; M Shimada; T Kajiwara; S Sarayama; FJ DiSalvo, Jan. 2002, 2, 1, 55, 58, Scientific journal, 10.1021/cg015548b
- Refereed, CHEMICAL COMMUNICATIONS, Complexed bridging ligand, {Cu(bptap)(2)}, as a ferromagnetic coupler, T Kajiwara; A Kamiyama; T Ito, 2002, 12, 1256, 1257, Scientific journal, 10.1039/b202967g
- Refereed, J. Solid State Chem.,, Synthesis and Structure of Ba8Cu3In4N5 with Nitridocuprate Groups and One-Dimensional Infinite Indium Clusters, KAJIWARA Takashi; H. Yamane; S. Sasaki; S. Kubota; R. Inoue; M. Shimada; T. Kajiwara, 2002, 163, 449-454
- Refereed, CHEMISTRY LETTERS, Synthesis and structural characterization of a Pd2+ complex with p-tert-butylsulfinylcalix[4]arene, N Morohashi; N Iki; S Miyano; T Kajiwara; T Ito, Jan. 2001, 1, 66, 67, Scientific journal
- Refereed, CHEMISTRY LETTERS, Sulfonylcalix[4]arene as a bis-tridentate facial ligand: Syntheses and structures of dinuclear complexes, [M-2(L)(H2O)(2)(dmf)(4)] (M = Co(II), Ni(II); H4L = p-tert-butylsulfonylcalix[4]arene), T Kajiwara; S Yokozawa; T Ito; N Iki; N Morohashi; S Miyano, Jan. 2001, 1, 6, 7, Scientific journal
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, Na3Ca2TaO6, a rock-salt superstructure phase with a fully ordered cation arrangement, H Yamane; H Takahashi; T Kajiwara; M Shimada, Oct. 2000, 56, 1177, 1178, Scientific journal
- Refereed, JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, Zinc-blende-type cubic GaN single crystals prepared in a potassium flux, H Yamane; T Kajiwara; T Sekiguchi; M Shimada, Feb. 2000, 39, 2B, L146, L148, Scientific journal
- Refereed, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, A graphite-like complex with large cavities constructed with the complex ligand [Ni-II(bpca)(2)], A Kamiyama; T Noguchi; T Kajiwara; T Ito, 2000, 39, 17, 3130, 3132, Scientific journal
- Refereed, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Mixed-valent heptairon complex with a ground-state spin value of S=12/2 constructed from a triiron cluster ligand, T Kajiwara; T Ito, 2000, 39, 1, 230, +, Scientific journal
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, [Fe(C12H8N3O2)Cl-2(ROH)], with R = Me and Et, T Kajiwara; T Ito, Jan. 2000, 56, 22, 23, Scientific journal
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, Na2Ca3Ta2O9 with a simple stacking of oxygen triangular nets, H Yamane; H Takahashi; T Kajiwara; M Shimada, Dec. 1999, 55, 1978, 1980, Scientific journal
- Refereed, ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, A trinuclear Pd2Ni complex, [ (C6H5)(4)P](2)-[ (PdCl3)(2)(Ni(C12H18N2O2)}], A Kamiyama; T Kajiwara; T Ito, Aug. 1999, 55, 1282, 1284, Scientific journal
- Refereed, MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS, Fe(II)-Fe(III) alternate ferrimagnetic chain constructed with complexed-ligand [Fe(bpca)(2)](+) (Hbpca = bis(2-pyridylcarbonyl) amine), T Kajiwara; T Ito, 1999, 335, 785, 792, Scientific journal
- Refereed, JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, Complexed bridging ligand, [M(bpca)(2)] (M = Mn(II) or Fe(II); Hbpca = bis(2-pyridylcarbonyl)amine), as a building block for linear trinuclear complexes, T Kajiwara; T Ito, Oct. 1998, 20, 3351, 3352, Scientific journal
- Refereed, JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, Mercury-carbon bond formation promoted by the co-ordinated ligand reaction of a beta-diiminate chelate, T Kajiwara; R Murao; T Ito, Aug. 1997, 15, 2537, 2538, Scientific journal
- Refereed, JOURNAL OF COORDINATION CHEMISTRY, Hydrogenation of a delocalized diiminate six-membered chelate ring in tetraazamacrocyclic nickel(II) complexes by sodium borohydride in water - Effect of protonation-deprotonation equilibria and stereoselective reduction, K Mochizuki; T Kondo; S Manaka; T Kajiwara; T Ito, 1996, 37, 1-4, 205, 216, Scientific journal
- Refereed, BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, SYNTHESIS, STRUCTURE, AND MAGNETIC PROPERTY OF LINEAR CHLORO-BRIDGED NICKEL(II) TETRAMER WITH DINUCLEATING BIS-DIMETHYLCYCLAM LIGAND, T KAJIWARA; T YAMAGUCHI; H OSHIO; T ITO, Aug. 1994, 67, 8, 2130, 2135, Scientific journal
- Refereed, JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, DESIGN OF COMPLEX-LIGAND SYSTEMS BASED ON THIOURACIL - A NOVEL CYCLIC TETRAMER OF COBALT(III) WITH 1-(2-THIOURACIL-4-METHYLENE)-3,6-DIAZAHEXANE, T KAJIWARA; T ITO, Aug. 1994, 15, 1773, 1774, Scientific journal
- Refereed, INORGANIC CHEMISTRY, A DINUCLEATING BIS(DIMETHYLCYCLAM) LIGAND AND ITS DINICKEL(II) AND DIZINC(II) COMPLEXES WITH THE FACE-TO-FACE RING ARRANGEMENT, T KAJIWARA; T YAMAGUCHI; H KIDO; S KAWABATA; R KURODA; T ITO, Nov. 1993, 32, 23, 4990, 4991
- Refereed, 2023, 11, 2082, 2088
- Refereed, 2023, 127, 3295, 3306
- Refereed, 2022, 9, 6271, 6278, 10.1039/d2qi01607a
- Refereed, 2022, 12, 1, 16601, 10.1038/s41598-022-20893-2
- 2020, 124, 7930, 7937, https://dx.doi.org/10.1021/acs.jpcc.9b11057
MISC
- Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 29aXW-3 Neutron scattering study on spin dynamics in rare-earth based single-molecule magnets III, Kofu M.; Kajiwara T.; Nakano M.; Nakajima K.; Simeoni Giovanna; Gardner Jason; Tyagi Madhusudan; Yamamuro O., 26 Mar. 2013, 68, 1, 560, 560
- Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 22pGP-11 Neutron scattering study on spin dynamics in rare-earth based single-molecule magnets II, Kofu M.; Kajiwara T.; Nakano M.; Nakajima K.; Kawamura S.; Kikuchi T.; Inamura Y.; Ymamuro O., 24 Aug. 2011, 66, 2, 434, 434
- Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 26aWL-7 Neutron scattering study on spin dynamics in rare-earth based single-molecule magnets, Kofu M.; Kajiwara T.; Nakano M.; Nakajima K.; Kawamura S.; Kikuchi T.; Inamura Y.; Yamamuro O., 18 Aug. 2010, 65, 2, 447, 447
- Not Refereed, POLYHEDRON, Solvent induced reversible change of magnetic properties in a Fe(II)-Fe(III) single chain magnet, Yukihiro Kaneko; Takashi Kajiwara; Hisanori Yamane; Masahiro Yamashita, Jun. 2007, 26, 9-11, 2074, 2078, 10.1016/j.poly.2006.10.005
- Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 27aTE-5 Structures and Physical Properties of Mn_4 Single-Molecule Magnets with Pt(mnt)_2 Molecular Conductors, NAKATA Kazuya; Hiraga Hiroki; Miyasaka Hitoshi; Takaishi Shinya; Kajiwara Takashi; Yamashita Masahiro; Oshima Yugo; Nojiri Hiroyuki, 04 Mar. 2006, 61, 1, 424, 424
- Not Refereed, Molecular Physics, A New Series of Radical-Triplet Pair System : Modulation of Radical-Triplet Interaction by a Counter Ion, L. Maretti; I. SM Saiful; T. Kajiwara; R. Miyamoto; Y. Ohba; S.Yamauchi, 2006, 104, 1619, 1626, 10.1080/00268970500493334
- 19 Aug. 2005, 60, 2, 687, 687
Presentations
- 20 Mar. 2024, 18 Mar. 2024 - 21 Mar. 2024
- 19 Mar. 2024, 18 Mar. 2024 - 21 Mar. 2024
- 30 May 2023, 30 May 2023 - 31 May 2023
- KAJIWARA Takashi, Gd(III)錯体における遅い磁化緩和現象, Oral presentation, May 2019
- KAJIWARA Takashi, トリスジピコリナトGd(III)単核錯体における遅い磁気緩和の発現, Oral presentation, Mar. 2019
- KAJIWARA Takashi, トリスジピコリナトDy(III)単核錯体のSMM特性における対カチオン交換の効果, Mar. 2019
- KAJIWARA Takashi; Takashi Kajiwara, The 2nd International Symposium on Coordination Ionic Compounds, Lanthanide-based Single Molecule Magnets - Correlation between the Molecular Structure and the Magnetic Anisotropy, Dec. 2018, True
- KAJIWARA Takashi; K. Kobayashi; Y. Harada; Y. Kataoka; T. Kajiwara, International Conference on Coordination Chemistry, 2018, Sendai, Syntheses and SMM properties of Ln(III) complexes supported by an N5-Schiff base ligand, Aug. 2018, True
- KAJIWARA Takashi; M. Kudo; Y. Kataoka; T. Kajiwara, International Conference on Coordination Chemistry, 2018, Sendai, Sensing Ability of Luminescent Lanthanide Complexes for Anions Supported by Cyclen-based Ligands, Aug. 2018
- KAJIWARA Takashi; Y. Masuda; S. Sakata; S. Kayahara; N. Irie; Y. Kataoka; T. Kajiwara, International Conference on Coordination Chemistry, 2018, Sendai, Slow Magnetic Relaxation Properties of M(II)?Ln(III)?M(II)\nTrinuclear Complexes (Ln = Gd, Tb; M = Mg, Zn), Aug. 2018
- KAJIWARA Takashi; S. Sakata; Y. Masuda; N. Irie; S. Kayahara; Y. Kataoka; T. Kajiwara, International Conference on Coordination Chemistry, 2018, Sendai, Syntheses, structures, and SMM behaviors of M-Ln(III)-M trinuclear complexes with threefold symmetry (Ln = Ce, Nd; M = Mg), Aug. 2018
- KAJIWARA Takashi, N5-Schiff塩基配位子をエカトリアルに持つ Ln(III)錯体の合成と単分子磁石特性, Mar. 2018, False
- KAJIWARA Takashi, サイクレン骨格を有する発光性希土類錯体によるアニオン認識能の検討, Mar. 2018, False
- KAJIWARA Takashi, IDA骨格を基盤とする新規四座配位子を含むEu(III)錯体の水溶液中における錯体形成挙動と発光特性の検討(IDA:iminodiacetic acid), Mar. 2018, False
- KAJIWARA Takashi, 希土類を基盤とする単分子磁石の設計と物性, Jan. 2018
- KAJIWARA Takashi; Takashi Kajiwara, One Day Symposium of Research Center for Structural Thermodynamics, Lanthanide-based single molecule magnets?design of the magnetic anisotropy, Dec. 2017
- KAJIWARA Takashi, 三回対称性をもつMg(II)-Ln(III)-Mg(II)三核錯体(Ln = Ce, Nd)における磁気希釈が磁気特性に及ぼす効果, Sep. 2017, False
- KAJIWARA Takashi, オキシ二酢酸を配位子としたLnIII単核錯体における遅い磁化緩和の発現, Sep. 2017, False
- KAJIWARA Takashi, 直線状M(II)-Ln(III)-M(II)三核錯体の磁気特性に対して及ぼす因子の解明 (Ln = Gd, Tb, M= Mg, Zn), Sep. 2017, False
- KAJIWARA Takashi, 3回対称を持つLn(III)単分子磁石に対するプロトン化の効果, Sep. 2017, False
- KAJIWARA Takashi, 三回対称性をもつMg(II)?Ln(III)?Mg(II)三核錯体 (Ln = Ce, Pr, Nd)の合成と構造および磁気特性の比較, Mar. 2017, False
- KAJIWARA Takashi, 直線状TM(II)?Tb(III)?TM(II)三核錯体において反磁性金属イオンがTb(III)イオンの遅い磁化緩和に及ぼす効果 (TM(II) = Mg(II)，Zn(II)，Cd(II)), Mar. 2017, False
- KAJIWARA Takashi, 分子サイズの磁石を作る～分子磁性体の仕組みと設計 Syntheses of Molecular-based Magnets ? Designing of Magnetic Anisotropy ?, Nov. 2016, False
- KAJIWARA Takashi, 分子磁性体の最近の話題～d金属とf金属の違いを中心に, Nov. 2016, False
- KAJIWARA Takashi; Saori Kayahara; Natsumi Irie; Poh Ling Then; Chika Takehara; Yumiko Kataoka; Takashi Kajiwara; Tomoo Yamamura, ICMM2016 The 15th International Conference on Molecule-Based Magnets, Synthesis and Single Molecule Magnet behavior of linear Zn(II)-Tb(III)-Zn(II) trinuclear complex which possesses three-fold symmetry, Sep. 2016, True
- KAJIWARA Takashi; Natsumi Irie; Saori Kayahara; Chika Takehara; Poh Ling Then; Yumiko Kataoka; Takashi Kajiwara; Tomoo Yamamura, ICMM2016 The 15th International Conference on Molecule-Based Magnets, Syntheses, structures, and SMM behaviors of a Zn(II)-Ce(III)-Zn(II)complexes with threefold symmetry, Sep. 2016, True
- KAJIWARA Takashi; Saki Nakanishi; Haruna Ogawa; Saori Kayahara; Natsumi Irie; Yumiko Kataoka; Takashi Kajiwara; Tomoo Yamamura, ICMM2016 The 15th International Conference on Molecule-Based Magnets, Slow magnetic relaxation behaviors of Ln(III) complexes which belong to the D3 point group, Sep. 2016, True
- KAJIWARA Takashi; Haruna Ogawa; Saki Nakanishi; Saori Kayahara; Natsumi Irie; Yumiko Kataoka; Takashi Kajiwara; Tomoo Yamamura, ICMM2016 The 15th International Conference on Molecule-Based Magnets, Syntheses and SMM behaviors of prolate-type Ln(III) mononuclear complexes which belong to the D3 point group, Sep. 2016, True
- KAJIWARA Takashi, 結晶学的に三回対称を持つZn(II)－Ln(III)－Zn(II)三核錯体の合成と単分子磁石特性, Sep. 2016, False
- KAJIWARA Takashi, 三回対称を持つCe(III)単分子磁石の合成と磁気特性の比較, Sep. 2016, False
- KAJIWARA Takashi, 溶液中での五配位座Pybox誘導体を用いたEu(III)錯体の構造と発光特性の相関, Sep. 2016, False
- KAJIWARA Takashi, Pybox配位子を含むEu(III)/Tb(III)混合希土類錯体による発光性アニオンセンシング, Sep. 2016, False
- KAJIWARA Takashi, 点群D3の対称性を持つLn(III)単核錯体における遅い磁化緩和の発現, Sep. 2016, False
- KAJIWARA Takashi, 3回対称を持つLn(III)単分子磁石に対する側鎖導入の効果, Sep. 2016, False
- KAJIWARA Takashi; Takashi Kajiwara; Poh Ling Then; Chika Takehara; Yumiko Kataoka; Tomoo Yamamura, Rare Earths 2016 in Sapporo, Single Molecule Magnet behaviors of isostructural Zn(II)-Ln(III)-Zn(II) tri-nuclear complexes (Ln = Ce, Nd, Tb, and Dy), Jun. 2016, Sapporo, Japan, True
- KAJIWARA Takashi; Saori Kayahara; Natsumi Irie; Poh Ling Then; Chika Takehara; Yumiko Kataoka; Takashi Kajiwara; Tomoo Yamamura, Rare Earths 2016 in Sapporo, Syntheses and Single Molecule Magnet Behaviors of Linear Zn(II)-Ln(III)-Zn(II) Trinuclear Complexes which Possess Pseudo Three-fold Symmetry (Ln = Tb, Dy), Jun. 2016, Sapporo, Japan, True
- KAJIWARA Takashi, 点群D3の対称性を持つLn(III)単核錯体における遅い磁化緩和の発現, Mar. 2016, False
- KAJIWARA Takashi, 点群D3の対称性を持つYb(III)単核錯体の合成とSMM特性, Mar. 2016, False
- KAJIWARA Takashi, 擬似的な三回対称を持つ直線状Zn(II)－Ln(III)－Zn(II)三核錯体の合成とSMM特性 (Ln = Tb, Dy), Mar. 2016, False
- KAJIWARA Takashi; Kajiwara, Takashi; Takehara, Chika; Then, Poh Ling; Kataoka,Yumiko, The International Chemical Congress of Pacific Basin Societies 2015, SMM behaviors of isostructural Zn(II)-Ln(III)-Zn(II) tri-nuclear complexes (Ln = Ce, Nd, Tb, and Dy), Dec. 2015, True
- KAJIWARA Takashi; Kayahara, Saori; Irie, Natsumi; Ooka, Sayaka; Wada, Hisami; Takehara, Chika; Then, Poh Ling; Kataoka, Yumiko; Kajiwara, Takashi; Yamamura, Tomoo, The International Chemical Congress of Pacific Basin Societies 2015, Syntheses and SMM behaviors of linear ZnII - LnIII - ZnII trinuclear complexes with pseudo threefold symmetry\n(Ln = Pr, Nd), Dec. 2015, True
- KAJIWARA Takashi; Nakamura, Kaho; Nokami, Misa; Tomotsuka, Ikumi; Harai, Maki; Kataoka, Yumiko; Kajiwara, Takashi, The International Chemical Congress of Pacific Basin Societies 2015, Luminescence Anion Sensing with Mixed-Ln(III) Complex containing Tridentate Pybox Ligand, Dec. 2015, True
- KAJIWARA Takashi; Nokami, Misa; Nakamura, Kaho; Tomotsuka, Ikumi; Harai, Maki; Kataoka, Yumiko; Kajiwara, Takashi, The International Chemical Congress of Pacific Basin Societies 2015, Syntheses and Luminescence Properties of Ln(III) Complexes containing Pentadentate Pybox Derivative, Dec. 2015, True
- KAJIWARA Takashi; Wada, Hisami; Ooka, Sayaka; Then, Poh Ling; Takehara, Chika; Kataoka, Yumiko; Kajiwara, Takashi; Yamamura, Tomoo, The International Chemical Congress of Pacific Basin Societies 2015, Syntheses and SMM behaviors of lanthanide(III) azacrown-ether complexes; correlation between magnetic\nbehaviors and crystal structures, Dec. 2015, True
- KAJIWARA Takashi, 結晶学的に三回対称を持つZn(II)－Ln(III)－Zn(II)三核錯体の合成と単分子磁石特性, Sep. 2015, False
- KAJIWARA Takashi, 多座キレート配位子を用いたEr(III)単分子磁石合成の試み, Sep. 2015, False
- KAJIWARA Takashi, Pybox誘導体を用いた希土類錯の構造と発光特性相関について, Sep. 2015, False
- KAJIWARA Takashi, 擬似的な三回対称を持つ直線状Zn(II)－Ln(III)－Zn(II) 三核錯体の合成とSMM特性 (Ln = Pr, Nd), Mar. 2015, False
- KAJIWARA Takashi, 擬似的な三回対称を持つ直線状Zn(II)－Ce(III)－Zn(II) 三核錯体の合成と構造、およびSMM特性の比較, Mar. 2015, False
- KAJIWARA Takashi, Ln(III) azacrown-ether錯体の合成と単分子磁石特性; 磁気特性と\n結晶構造の相関, Mar. 2015, False
- KAJIWARA Takashi, 五配座Pybox誘導体を含むEu(III) / Tb(III)錯体におけるアニオン依存の発光応答性, Mar. 2015, False
- KAJIWARA Takashi, クラウン骨格を有するPybox配位子を含むEu(III)錯体によるアニオン-カチオン認識, Mar. 2015, False
- KAJIWARA Takashi, Pybox配位子を含むEu(III)-Tb(III)混合錯体によるマルチアニオンセンシング, Mar. 2015, False
- KAJIWARA Takashi, 軽希土類を基盤とする単分子磁石, Feb. 2015, False
- KAJIWARA Takashi, 希土類単分子磁石における磁化緩和の詳細な解析, Feb. 2015, False
- KAJIWARA Takashi, 軽希土類単分子磁石の合成と磁気特性の比較, Sep. 2014, False
- KAJIWARA Takashi; Maki Harai; Ikumi Tomotsuka; Yumiko Kataoka; Takashi Kajiwara, 41st International Conference on Coordination Chemistry, Syntheses and Luminescence Properties of LN(III) Complexes with Pybox Derivatives, Jul. 2014, True
- KAJIWARA Takashi; Ikumi Tomotsuka; Maki Harai; Yumiko Kataoka; Takashi Kajiwara, 41st International Conference on Coordination Chemistry, Syntheses and Luminescence Properties of Lanthanide complexes with Pyboc Ligands Connected to 15-crown-5-ether Moiety, Jul. 2014, True
- KAJIWARA Takashi; Hisami Wada; Sayaka Ooka; Chika Takehara; Poh Ling Then; Yumiko Kataoka; Takashi Kajiwara; Tomoo Yamamura, 41st International Conference on Coordination Chemistry, Synthesis and SMM Behavior of Cerium(III) Crown-ether Complex, Jul. 2014, True
- KAJIWARA Takashi; Sayaka Ooka; Hisami Wada; Chika Takehara; Poh Ling Then; Yumiko Kataoka; Takashi Kajiwara; Tomoo Yamamura, 41st International Conference on Coordination Chemistry, Syntheses and SMM Behaviors of Ln(III) Crown-ether Compelxes, Jul. 2014, True
- KAJIWARA Takashi; Chika Takehara; Shiori Hino; Poh Ling Then; Yumiko Kataoka; Takashi Kajiwara; Motohiro Nakano; Tomoo Yamamura, 41st International Conference on Coordination Chemistry, Syntheses and Magnetic Properties of Cerium(III)-SMMs, Jul. 2014, True
- KAJIWARA Takashi; Poh Ling Then; Chika Takehara; Kei Yamashita; Takashi Kajiwara; Yumiko Kataoka; Motohiro Nakano; Tomoo Yamamura, 41st International Conference on Coordination Chemistry, Syntheses and SMM Behaviours of Linear Zn(II)-Dy(III)-Zn(II) Trinuclear Complexes, Jul. 2014, True
- KAJIWARA Takashi, 15-クラウン-5-エーテル骨格を有するPybox配位子を含む希土類錯体の合成と発光特性, Mar. 2014, False
- KAJIWARA Takashi, Pybox誘導体を用いたLn(III)錯体の合成と発光特性, Mar. 2014, False
- KAJIWARA Takashi, Ln(III) crown-ether錯体の合成とSMM特性, Mar. 2014, False
- KAJIWARA Takashi, Ce(III) crown-ether錯体の合成とSMM特性, Mar. 2014, False
- KAJIWARA Takashi, 希土類単分子磁石の設計と遅い磁化緩和の観測, Feb. 2014, False
- KAJIWARA Takashi, 希土類錯体の特異な磁気特性, Feb. 2014, False
- KAJIWARA Takashi, 単分子磁石Zn(II)-Dy(III)-Zn(II)直線状三核錯体における非常に遅い磁化緩和, Nov. 2013, False
- KAJIWARA Takashi, Ce(III)単分子磁石の合成と磁気特性の詳細, Nov. 2013, False
- KAJIWARA Takashi, 直線状Zn(II)-Dy(III)-Zn(II)三核錯体の合成とSMM特性の比較, Nov. 2013, False
- KAJIWARA Takashi, 水溶液中で発光性を示すTripod型配位子を有する希土類錯体の錯体形成挙動と発光特性, Nov. 2013, False
- KAJIWARA Takashi; Chika Takehara; Shiori Hino; Then Poh Ling; Takashi Kajiwara; Yumiko Kataoka; Motohiro Nakano; Tomoo Yamamura, The 2nd Japan-France Coordination Chemistry Symposium 2013, Syntheses and magnetic properties of Ce(III)-SMMs, Nov. 2013, True
- KAJIWARA Takashi; Then Poh Ling; Chika Takehara; Kei Yamashita; Takashi Kajiwara; Yumiko Kataoka; Motohiro Nakano; Tomoo Yamamura, The 2nd Japan-France Coordination Chemistry Symposium 2013, Syntheses and SMM Behaviours of Linear Zn(II)-Dy(III)-Zn(II) Trinuclear Complexes, Nov. 2013, True
- KAJIWARA Takashi, 直線状Zn(Ⅱ)-Ce(Ⅲ)-Zn(Ⅱ)三核錯体の合成、構造とSMM挙動の発現, Mar. 2013
- KAJIWARA Takashi, Zn(II)-Tb(III)-Zn(II)単分子磁石の構造制御と磁気特性の相関, Mar. 2013, False
- KAJIWARA Takashi, 中性子散乱による希土類単分子磁石のスピンダイナミクスの研究III, Mar. 2013
- KAJIWARA Takashi; Takashi Kajiwara; Akiko Watanabe; Aika Yamashita; Kei Yamashita; Yumiko Kataoka; Motohiro Nakano; Tomoo Yamamura, 40th International Conference on Coordination Chemistry, LnZn, LnZn2, and LnZ3 Complexes as Single-Molecule Magnets, Sep. 2012, Valencia, Spain
- KAJIWARA Takashi; Kei Yamashita; Rie Miyazaki; Yumiko Kataoka; Takashi Kajiwara; Motohiro Nakano; Tomoo Yamamura, 40th International Conference on Coordination Chemistry, Single-Molecule-Magnet behaviors of linear Zn(II)-Ln(III)-Zn(II) complexes, Sep. 2012, Valencia, Spain
- KAJIWARA Takashi; Yumiko Kataoka; Naoko Kusunoki; Aika Yamashita; Takayuki Nakanishi; Yasuchika Hasegawa; Takashi Kajiwara, 40th International Conference on Coordination Chemistry, Molecular Design of Zn (II)n ?Ln(III) Multinuclear Complexes and Their Luminescence Properties, Sep. 2012, Valencia, Spain
- KAJIWARA Takashi, 直線状Zn(II)-Tb(III)-Zn(II)三核錯体の磁気特性の詳細の解明, Sep. 2012, False
- KAJIWARA Takashi, Zn(II)n-Ln(III)複核錯体によるアニオン応答性の希土類発光挙動, Sep. 2012, False
- KAJIWARA Takashi, 直線状Zn(II)-Ln(III)-Zn(II)三核骨格を基盤とする単分子磁石合成の軽希土類への展開, Sep. 2012, False
- KAJIWARA Takashi; Takashi Kajiwara, 62nd Fujihara Seminar, Structural Control of the Magnetic Anisotropy of Lanthanide-based SMMs, May 2012, The Fujihara Foundation of Science, Sendai, Japan, False
- Oral presentation
- Poster presentation
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- Oral presentation
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- Poster presentation, 18 Mar. 2024 - 21 Mar. 2024
- Poster presentation, 18 Mar. 2024 - 21 Mar. 2024
- Invited oral presentation, 30 May 2023 - 31 May 2023
- Oral presentation
- Oral presentation
Awards
Research Projects
- 基盤研究(C), 01 Apr. 2020 - 31 Mar. 2023, 20K05540, カチオン部位を有する配位子を用いた希土類単分子磁石の創出と磁気異方性の精密解析, 梶原 孝志, 日本学術振興会, 科学研究費助成事業, 奈良女子大学, 4420000, 3400000, 1020000, 本研究課題では希土類金属イオンの磁気異方性に立脚した遅い磁化緩和の発現（単分子磁石挙動の発現）を配位子の構造制御に基づいて制御するとともにその遅い磁化緩和の機構解明を目的としている。
希土類金属イオンは大きな軌道角運動量と磁化を保持し、結晶場の効果により特定の方向に磁化ベクトルの向きを固定するが可能となる。配位子はルイス塩基であり、その電荷と希土類金属イオンのｆ軌道との電荷反発に基づいて軌道角運動量の向きが特定の方向に固定される。もし配位子にルイス酸的な部位（カチオン性の部位）を導入することができれば、磁気異方性の強化が可能となると考え、そのような配位子の原材料となるピラジン-2,6-ジカルボン酸の合成を試み、グラムオーダーでの合成に成功した。
上記と並行し、ピラジンジカルボン酸と比較の対象となるピリジンジカルボン酸を配位子とする錯体についての研究を進めた。この中で、軌道角運動量を持たないガドリニウム錯体（既知）が40Kという高温まで遅い磁化緩和を示すことが明らかとなったので、その磁化緩和機構の解明を試みた。具体的には、一辺4-5mm程度の大きさの単結晶を育成し、分子の主軸（3回軸）に平行ないし垂直に磁場を印加した状態で交流磁化率を測定し、遅い磁化緩和の異方性について検討を行った。結果として結晶の配向に対する遅い磁化緩和の方向依存性を見出すことに成功した。このような磁化の異方性はほとんど知られておらず、遅い磁化緩和の機構解明に役に立つ事例であると考えている。, kaken - Grant-in-Aid for Scientific Research (C), 01 Apr. 2017 - 31 Mar. 2020, 17K05811, Symmetry-controled magnetization dynamics of single-molecule magnets, Kajiwara Takashi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 4810000, 3700000, 1110000, Several lanthanide complexes show slow magnetic relaxation phenomena under appropriate conditions and they are known as single-molecule magnets. For such complexes, we have examined to synthesize new complexes on the basis of the new molecular design, and to investigate the dynamic magnetic properties employing new instrument for angle-resolved ac susceptibility measurements. We synthesized mixed metal tri-nuclear complexes with the combination of lanthanide and diamagnetic divalent metal ions such as Zn(II) and Mg(II), and also the mono-lanthanide complexes. We found that the strong axial-crystal field enhances the slow magnetic relaxation phenomena, however, we also found that several axial symmetry around magnetic principal axis, which was parallel to molecular axis, accelerates the relaxation due to slight mixing of the ground doublet states., kaken
- Grant-in-Aid for Scientific Research (B), 01 Apr. 2011 - 31 Mar. 2016, 23350067, Detailed study of the slow magnetic relaxation phenomena of lanthanide-based single molecule magnets, Kajiwara Takashi; KATAOKA Yumiko, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 18070000, 13900000, 4170000, Paramagnetic complexes which show slow magnetic relaxation phenomena are known as single-molecule magnets (SMMs). In this work, we have proposed the mechanism of the slow relaxation of the magnetization for each lanthanide(III) ion, and synthesized several single-molecular magnets including Ce(III), Nd(III), Tb(III), Dy(III), Er(III), or Yb(III). Due to the characteristic 4f electrons, lanthanide(III) ions have large total angular momentum J and magnetic anisotropy. In the anisotropic ligand field, J ground state splits into Jz sub-states and in some cases, the Jz sub-states which direct along the z-axis were stabilized compared with other sub-state. This situation is known as Ising-type magnetic anisotropy. We have proposed how to design such an Ising-type anisotropy for each Ln(III) ion, and investigated the detail of slow magnetic relaxation features of the synthesized Ln(III) complexes., kaken
- Grant-in-Aid for Challenging Exploratory Research, 01 Apr. 2012 - 31 Mar. 2015, 24655127, Detailed study of the magnetic-structure of lanthanide-based single molecule magnets by neutron scattering method, KAJIWARA Takashi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 3900000, 3000000, 900000, Lanthanide(III) complexes which show a slow magnetic relaxation phenomenon are called as lanthanide-based single molecule magnets, SMMs. In this work, we have investigated the detail of the spin-flipping process of SMMs by means of the inelastic neutron scattering method. The application of neutron scattering on the soft materials such as SMMs was rather rare, and we have first explored the complexes which show SMM behavior being suitable for such a measurement. After detailed study of magnetic properties of candidates, we have synthesized two samples of which all hydrogen atoms were exchanged with deuterium (C40D39N8O11S2Zn2Ln、>98% atom D), and neutron scattering experiments were carried out at Cold-Neutron Disk-Chopper Spectrometer : AMATERAS, J-PARC, Tokai-mura. The analyses of the scattering data are now ongoing., kaken
- Grant-in-Aid for Scientific Research (C), 2010 - 2012, 22550053, Materials chemistry of uranium complexes with one-axis symmetry, SATOH Isamu; YAMAMURA Tomoo; LI Dexin; KAJIWARA Takashi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tohoku University, 4680000, 3600000, 1080000, Many of the uranium complexes at their oxidation states of +5 (5f1 electron configuration), +4 (5f2 configuration), and +3 (5f3 configuration) have ligand field of Cn with an-axis symmetry. Our experimental investigation were achieved by synthesis of uranium complexes with such variety of oxidation state and electronic configuration and discussed on the ligand field states on ground state., kaken
- Grant-in-Aid for Scientific Research (C), 2008 - 2010, 20550054, Tuning of the Physical Properties of Fe(II/III) Single-Chain Magnet, KAJIWARA Takashi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tohoku University, 4680000, 3600000, 1080000, A family of single-chain magnets, of which the SCM character originated from the spatial arrangement of high spin Fe^
ions with easy-plane anisotropy, was synthesized and their magnetic properties were investigated., kaken - 2008 - 2008, 20900108, Synthetic and magnetic studies of Lanthanide based Single-molecule Magnets, KAJIWARA Takashi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tohoku University, 個々の分子が磁石として振る舞う単分子磁石(single molecule magnet, SMM)の合成に際し, 重希土類金属イオンを用いる手法が注目を集めている. 本研究ではTb(III), Dy(III), Ho(III)等の希土類イオンに着目し, 磁気異方性発現のメカニズムと強化について結晶場の設計という観点から詳細の解明を試み, 分子設計によって磁気異方性と単分子磁石挙動をコントロールするための新たな手法について提示した., kaken
- 特定領域研究, 2007 - 2008, 19018004, 有機-希土類複合系における単分子磁性の光制御を指向した研究, 梶原 孝志, 日本学術振興会, 科学研究費助成事業, 東北大学, 1800000, 1800000, 単分子磁石とは一つの分子が磁石として振る舞う化合物であり,この20年間に分子磁性の分野では最も注目を集めている化合物群である.その合成に際し,大きな基底スピン多重度と容易軸型の磁気異方性の導入・制御が重要であるが,その実現のためには重希土類金属イオン,特にテルビウムやジスプロシウムの利用が有効である.2004年にTb-Cu二核錯体系として初めての単分子磁石が報告されて依頼,今日まで10例ほどの希土類系単分子磁石が報告されている.このような化合物群を対象とし,本課題研究では希土類金属イオンと周囲の金属イオンとの相互作用の解明,光による分子磁性の制御を目指した物質系の創成と、その詳細な物性・機能性の解明を目指し,研究を行った.光による分子磁性の制御を行うためには,希土類系の単分子磁石合成の設計指針の確立,つまり,確実に単分子磁石となりうる条件・ならない条件を明らかにする必要性がある.本研究では構造的にほとんど違いがないのにもかかわらず,単分子磁石として振る舞う錯体・振る舞わない錯体の1対について詳細な磁気挙動の測定を行い,このような違いが希土類金属イオン周りの配位構造の違いに起因する磁気異方性の違いに帰着できることを見出した.その結果,テルビウム(III)イオンは一般に容易軸型の磁気異方性を有すると考えられていたが,配位構造によっては困難軸型ともなりうること,また,容易軸型の異方性についても,結晶場構造の設計によりその特性を強化することが可能なことを見出した.以上の結果より,分子構造の設計に基づいて単分子磁石挙動を制御するための設計指針を示すことに成功した., kaken
- 若手研究(B), 2006 - 2007, 18750041, 外場により制御されるナノ磁石, 梶原 孝志, 日本学術振興会, 科学研究費助成事業, 東北大学, 3700000, 3700000, 磁石と呼ばれる化合物は構造的に二種類に大別され,2次元・3次元構造を持ち転位温度以下で長距離磁気秩序相を示すバルク磁石に対し,1次元ないし孤立した分子構造を有する磁石をナノ磁石と総称する.ナノ磁石が磁石として振る舞うメカニズムは,分子内に形成された双極小ポテンシャルによってスピン反転が妨げられることに起因し,分子構造の設計により磁気特性の制御が可能なことが大きな特徴である.ナノ磁石構築には,容易軸型の磁気異方性を有する金属イオンを強磁性的ないしフェリ磁性的に連結することが一般的な構築手法であるが,筆者は磁化容易面型の金属イオンを構造制御しながら連結することにより,これまでにないタイプのナノ磁石(単一次元鎖磁石)の構築に成功してきた.この系はその分子構造により磁気構造が規制されるため,外場に応答した構造的な変化と磁気挙動の変化が連動するという特徴を有する.構造変化の要因として,結晶溶媒の可逆な吸脱着に着目して研究を遂行した.錯体を形成する有機配位子部分に種々の置換基を導入した錯体を合成し,それぞれについて溶媒の吸脱着と磁気特性の変化について詳細を検討した結果,本系がこのような外場の変化に対して種々の応答を示すこと,例えば磁気特性が強化される系,ほとんど影響を受けない系,あるいはナノ磁石と常磁性の間を往復する系などを見出した.バルク磁石系ではこのような可逆な磁気挙動の変化を示す系は知られていたが,ナノ磁石系では初めての例である., kaken
- 特定領域研究, 2005 - 2006, 17042006, 有機-希土類複合系を基盤とする分子性発光材料の開発, 梶原 孝志, 日本学術振興会, 科学研究費助成事業, 東北大学, 3600000, 3600000, 希土類金属イオンと大環状有機配位子p-tert-ブチルスルポニルカリックスアレーンとにより形成されるナノサイズのクラスター錯体5種について選択的合成法を確立するとともに,その発光挙動の解明を実験化学的・計算化学的に行うことに成功した.この大環状配位子は分子全体に広がったπ共役系を有し,π-π励起は360〜380nmと低エネルギー領域に存在する.本配位子系においては構造的な自由度が高く,また,その高度に広がった共役系におけるエネルギー準位が構造に依存して変化するという極めて斬新な性質を有しており,その結果として構造に依存した希土類金属イオンの発光選択制が実現されている.つまり,配位子の励起三重項エネルギーが希土類金属イオンのf-f*励起エネルギーよりわずかに高いため,配位子励起に引き続くf-f*励起の進行は,配位子の励起三重項状態と希土類金属イオンのf*励起準位のごくわずかなエネルギーマッチングの良し悪しにより劇的な変化を見せる.この現象については分子軌道計算に基づく考察を行い,この機構の正しさが理論的な面からも証明された.また,Tb(III)とEu(III)の混合キュバン錯体系においては,溶媒の違いにより錯体の構造が変化することが種々の分光学的測定より明らかとなっているが,この構造の変化を発光色の違いにより目視により観測することにも成功した., kaken
- Grant-in-Aid for Scientific Research (B), 2002 - 2004, 14340203, Construction of Nano Strucutures Based on Metal Cluster Complexes and Their Chemistry, ITO Tasuku; YAMAGUCHI Tadashi; KAJIWARA Takashi, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Tohoku University, 16600000, 16600000, Main results are classified into three groups.
A.Oligomers of triruthenium cluster [Ru_3(O)(CH_3COO)_6L_3]^
We found the existence of"Charge Transfer Isomer"in the asymmetric mixrd valence state of the pyrazine bridged cluster dimer, and studied their dynamic behavior in intramolecular elecron transfer by means of IR spectro-electrochemical method. The fact that"charge transfer isomers"exist in a single oxidation statte of mixed valence state is extremely rare. Rate constants of intramolecular electron transfer within each isomer, which results in the interconversion of the charge transfer isomer, were on the IR time scale. These results have been published in Angew.Chem.Int., 43, 1376-1381 (2004).
We prepared linear oligomers of the cluster, pyrazine bridged trimer and tetramer. These oligomers were designed specifically to show multiple one electron reversible redox waves in their cyclic voltammograms. The trimer and tetramer showed, respecively, 11-step/12-electron and 14-step/15=electron reversible redox waves. These results have been published in Bull.Chem.Soc.Jpn.,78,591-598(2005).
B.Use of Pt(II)to metal dative bond,
Previously we had reported that carbon donor ligands exerted strong ligand field for platinum(II) ion, and that such platinum(II)complexes often form strong platinum to metal dative bonds. Using this idea, we prepared many of nano-sized cluster complexes with the platinum to metal dative bond. Typical examples are a tetranuclear platinum-rhodium-rhodium-platinum cluster complex and a one dimensional linear complex in which silver(I) and platinum(II) are alternately arranged. Manuscript of this study for publication is in preparation.
C.Use of metal cluster forming ligand.
We found in this study that p-tert-butyl-thiacalix[6]arene and p-tert-butyl-sulfonylcalix[4]arene act as cluster forming ligand. p-tert-butyl-sulfonylcalix[4]arene reacted with an excess of copper acetate to give a nano-sized decacopper cluster complex. And we found that a ferromagnetic interzcton operated in this cluster. This has been published in J.Am.Chem.Soc.,124,11274(2002). p-Tert-butyl-sulfonylcalix[4]arene reacted with lanthanoide ions to afford nano-sized compound with wheel like structure which sonsists of eight lanthanoide ions and four callixarene ligands. This study has been published in Angew.Chem.Int.,43,1382-1385(2004)., kaken - 若手研究(B), 2001 - 2002, 13740370, 鉄(III)三核クラスター配位子を用いた磁性多核錯体の構築, 梶原 孝志, 日本学術振興会, 科学研究費助成事業, 東北大学, 2100000, 2100000, 本研究は鉄(II)ないし鉄(III)イオンと有機配位子Hbpcaよりなる錯体を一つのユニットとして集積型金属錯体を構築し,その磁気的相互作用について詳細の解明と制御を目的として遂行したものである.表題の鉄(III)三核クラスター配位子(CL^-)は中心にμ_<3>-オキソにより架橋された鉄(III)三核クラスターコアを有し,鉄イオン間を架橋するアルコキソイオン,四つの塩化物イオン,そして配位可能なカルボニル酸素を提供する二つのbpca^-イオンよりなり,一価の負電荷を有する錯体であり、金属イオン集積体の構築素子として極めて有効である。二つのクラスター配位子と二価の第一遷移金属イオンから成る七核錯体における磁気的挙動は極めて複雑であり,その詳細の解明にむけ,bpca^-を介した磁気的相互作用の一般的な性質について明らかにした.特に,bpca^-の特徴的な架橋様式(疑似二回対称を有するκ^2N:κ^3N型配位)に基づき,σスピン間に軌道直交性による強磁性的相互作用が発現することを見いだしたのは大きな成果である.これに基づき,様々な金属イオンに対して"Ferromagnetic Coupler"として働くことのできる錯体配位子[Cu(bptap)_2]の創製に成功した(bptap^-はbpca^-のSchiff塩基誘導体).また,bpca^-を介して鉄(II)-鉄(III)を交互鎖状に配列させた錯体が単一次元鎖状磁石となることを見出した.これらの成果は,bpca-鉄系が磁性多核錯体構築の有効な原料となることを示すものである., kaken
- 奨励研究(A), 1999 - 2000, 11740366, 二重交換相互作用発現を目指した鉄(II,III,II)混合原子価三核錯体の合成, 梶原 孝志, 日本学術振興会, 科学研究費助成事業, 東北大学, 2100000, 2100000, 研究の過程で新規に鉄(III)三核クラスター配位子(CL-)の合成に成功した.CL-は中心にμ_3-オキソにより架橋された鉄(III)三核クラスターコアを有し,鉄イオン間を架橋するアルコキソイオン,四つの塩化物イオン,そして配位可能なカルボニル酸素を提供する二つのbpca-イオンよりなり,一価の負電荷を有する錯体である.CL-は同じ方向を向いた四つの配位可能なカルボニルサイトを有し、金属イオン集積体の構築素子として極めて有効である。二つのクラスター配位子と二価の第一遷移金属イオンから成る七核錯体を複数合成し、その磁気的挙動を調べた。特に鉄(II)イオン、マンガン(II)イオンとCL-よりなる七核錯体は、基底スピンがS=6,12/3と大きなものであり、その磁気的振る舞いは特異なものである。混合原子価鉄七核錯体(前者)においては、まだプレリミナリーな結果ながら磁気異方性が存在することも強磁場中のトルク測定より明らかとなった。基底スピン多重度が大きなものとなるのはクラスター配位子と中心の鉄(II)イオンとの間の強い相互作用によると考えられるが,この相互作用はクラスター配位子内の鉄(III)イオンと中心の鉄(II)イオン間の電荷移動的な相互作用に基づく可能性が高く,本研究課題の二重交換相互作用が働いていることを示唆するものである.単分子磁石となる可能性を含め,今後の発展性のある新たな化合物群の創製に成功したことが本課題研究における成果と言える., kaken
- 希土類系単分子磁石の磁気特性設計，合成と評価, 0, 0, 0, Competitive research funding
- 01 Apr. 2020 - 31 Mar. 2023, 20K05540, Principal investigator, カチオン部位を有する配位子を用いた希土類単分子磁石の創出と磁気異方性の精密解析
- 01 Apr. 2020 - 31 Mar. 2023, 20K05540, Principal investigator, カチオン部位を有する配位子を用いた希土類単分子磁石の創出と磁気異方性の精密解析
- 01 Apr. 2020 - 31 Mar. 2023, 20K05540, Principal investigator, カチオン部位を有する配位子を用いた希土類単分子磁石の創出と磁気異方性の精密解析
- 基盤研究C, 01 Apr. 2020 - 31 Mar. 2023, 20K05540, Principal investigator, カチオン部位を有する配位子を用いた希土類単分子磁石の創出と磁気異方性の精密解析
