2007 Fiscal Year Final Research Report Summary
Development of Single-molecule Magnets and Related Molecule-based Magents
| Project/Area Number |
17550166
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials/Devices
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
NOGAMI Takashi The University of Electro-Communications, 電気通信学部, Prof (80029280)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIDA Takayuki The University of Electro-Communications, 電気通信学部, Assoc.Prof (00232306)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Molecule-based magnets / Metal-assembled complex / Supramolecular chemistry / Single-molecule magnets / Single-chain magnets / 磁性電導体 |
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| Research Abstract |
Single-molecule magnets (SMMs) and single-chain magnets (SCMs) attract much attention in materials chemistry. We have exploited potential utility of the bridging paramagnetic ligands (HIN, HNN, CnPNN). A strong character of SCM is operative in the magnetically ordered state in the one-dimensional Co-C4PNN complex, giving a largest class of the coercive field (52 kOe or 4.1 MA m-1 at 6 K).
Several oligonuclear 3d-4f heterometallic complexes have been characterized as ground ferrimagnetic high-spin molecules. Lanthanide ions are supposed to be promising candidates for the elements of single-molecule magnets (SMMs) because of the large magnetic momentum and anisotropy. We have established the [Dy2Cu], [Dy4Cu], and [Dy2Cu2] complexes as new SMMs and [Dy2Cu2]n as a SCM. A plausible mechanism for quantum tunneling of magnetization has been proposed for the first time among the 3d-4f heterometallic SMMs and SCMs. The 3d-4f exchange magnetic couplings were precisely evaluated by means of high-frequency EPR spectroscopy.
Another subject of the present research is multi-functional molecule-based magnets. Supramolecular techniques have been used to tune or control molecule-based magnetic materials. We have developed nano-porous magnetic materials, whose magnetic properties were changed by inclusion of small diamagnetic molecules. Switchable magnets by means of host-guest chemistry have been developed. Host-guest complexes of tri- and tetra-radical-substituted azamacrocycles afforded the folded structures of the hosts where the radical oxygen atoms were coordinated to the guest metal ion, leading to enhanced antiferromagnetic couplings in the solid state and an ESR line broadening in the solution phase.
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[Journal Article] Mono- and Dinitroxide Radicals from 9,9'(10H,10'H)- Spirobiacridine : An Approach to a D2 d Triplet Biradical2007
Author(s)
T., Ishida, M., Ooishi, N., Ishii, H., Mori, T., Nogami
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Journal Title
Polyhedron 26
Pages: 1793-1799
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Tetranuclear Heterometallic Cycle Dy,Cu2 and the Corresponding Polymer Showing Slow Relaxation of Magnetization Reorientation2007
Author(s)
S., Ueki, A., Okazawa, T., Ishida, T., Nogami, H., Nojiri
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Journal Title
Polyhedron 26
Pages: 1970-1976
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Quantum Tunneling of Magnetization via Well-Defined Dy-Cu Exchange Coupling in a Ferrimagnetic High-Spin [Dy,Cul Single-Molecule Magnet2007
Author(s)
S., Ueki, T., Ishida, T., Nogami, K.-Y., Choi, H., Nojiri
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Journal Title
Chem. Phys. Lett 440
Pages: 263-267
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Electron Donors from Natural Products : Donating and Ligating Abilities and Charge-Transfer Complex Formation of Imidazo[1,2-alpyrazin-3(7H)-ones2007
Author(s)
M., Suzuki, T., Fujii, T., Nogami, T., Hirano, T., Ishida
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Journal Title
Multifunctional Conducting Molecular Materials, ed. by G. Saito, F. Wudl, R. C. Haddon, T. Katsumi, T. Enoki, H. E. Katz
Pages: 55-58
Description
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[Journal Article] Oximate-Bridged Trinuclear Dy-Cu-Dy Complex Behaving as a Single-Molecule Magnet and Its Mechanistic Investigation2006
Author(s)
F., Mori, T., Nyui, T., Ishida, T., Nogami, K.-Y., Choi, H., Nojiri
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Journal Title
J. Am. Chem. Soc 128
Pages: 1440-1441
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Bistable Polymorphs Showing Diamagnetic and Paramagnetic States of an Organic Crystalline Biradical Biphenyl-3,5-diyl Bis(tert-butylnitroxide)2006
Author(s)
H., Nishimaki, S., Mashiyama, M., Yasui, T., Nogami, T., Ishida
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Journal Title
Chem. Mater 18
Pages: 3602-3604
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Double Half-cubane Copper(II) Complexes Available from Copper(II) 1,1,1,5,5,5-Hexafluoropentane-2,4-dionate Dissolved in Formami des2006
Author(s)
Y., Morishita, T., Kogane, T., Nogami, T., Ishida
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Journal Title
Dalton Trans
Pages: 4438-4443
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Effect of Staggered Field on the Magnetization Process of S = 1/2 Antiferromagnetic Chains2005
Author(s)
A., Matsuo, K., Hosokawa, Y., Narumi, K., Okunishi, N., Maeshima, T., Asano, Y., Ajiro, T., Ishida, T., Nogami, K., Kindo
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Journal Title
Prog. Theor. Phys. 159(Suppl.)
Pages: 158-162
Description
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[Presentation] Study on Chelate Complexes Involving Heteroaromatic Nitroxides2007
Author(s)
Y., Terakado, A., Okazawa, T., Nogami, T., Ishida
Organizer
ISESS-SEST2007, A Joint Conference of the International Symposium on Electron Spin Science and the 46th Annual Meeting of the Society of Electron Spin Science and Technology
Place of Presentation
Shizuoka
Year and Date
20071106-09
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Mono- and Dinitroxide radicals from 9,9'(10H,10'H)- spirobiacridine : An Approach to a D, Triplet Biradical2006
Author(s)
T., Ishida, N., Ishii, H., Mori, M., Ooishi, T., Nogami
Organizer
10th International Conference on Molecule-based Magnets
Place of Presentation
Canada
Year and Date
20060800
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Tetranuclear Copper(II) Complexes Sandwitched with Two Tetrahydropyran-2,4,6-triolate Ligands2006
Author(s)
Y., Morishita, T., Ishida, T., Nogami, T., Kogane
Organizer
10th International Conference on Molecule-based Magnets
Place of Presentation
Victoria, Canada
Year and Date
20060800
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Preparation, Structure, and Magnetic Properties of Chelating Compounds of 2-Pyridyl Nitroxide Derivatives'2006
Author(s)
A., Okazawa, T., Shimada, T., Ishida, T., Nogami
Organizer
10th International Conference on Molecule-based Magnets
Place of Presentation
Victoria, Canada
Year and Date
20060800
Description
「研究成果報告書概要(欧文)」より
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[Presentation] 分子磁性の超分子スイッチ2006
Author(s)
石田尚行・野上 隆
Organizer
第一回ホストゲスト化学シンポジウム
Place of Presentation
つくば市
Year and Date
20060529-30
Description
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[Presentation] Rectangular Tetraterbium- and Tetradysprosium-Copper Complex Ions Behaving as Single-Molecule Magnets2005
Author(s)
S., Ueki, T., Ishida, T., Nogami, K.-Y., Choi, H., Nojiri
Organizer
The 2005 International Chemical Congress of Pacific Basin Societies (PacifiChem 2005), 15-20
Place of Presentation
Honolulu
Year and Date
20051200
Description
「研究成果報告書概要(欧文)」より
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[Presentation] tert-Butyl 2-Pyridyl Nitroxides as Paramagnetic Chelating Ligands2005
Author(s)
A., Okazawa, K., Osanai, K., Yanagi, T., Shimada, T., Nogami, T., Ishida
Organizer
The 2005 International Chemical Congress of Pacific Basin Societies (PacifiChem 2005), 15-20
Place of Presentation
Honolulu
Year and Date
20051200
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Electron Donors from Natural Products : Donating Ability and Charge Transfer Complexes of Vargula and Firefly Luciferins2005
Author(s)
T., Ishida, M., Suzuki, T., Fujii, T., Nogami, T., Hirano
Organizer
The 2005 International Chemical Congress of Pacific Basin Societies (PacifiChem 2005), 15-20
Place of Presentation
Honolulu
Year and Date
20051200
Description
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