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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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,940,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥240,000)
Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2005: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Keywords | Molecule-based magnets / Metal-assembled complex / Supramolecular chemistry / Single-molecule magnets / Single-chain magnets / 磁性電導体 / 分子磁性 / 遷移金属錯体 / 結晶構造解析 / 希土類イオン錯体 / 磁気転移 / 電荷移動錯体 / 電導性有機錯体 / 伝導性有機錯体 |
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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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Report
(4 results)
Research Products
(221 results)
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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
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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
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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
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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
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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
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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
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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] 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
Description
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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
Description
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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
Description
「研究成果報告書概要(欧文)」より
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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
Description
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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
Description
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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
Description
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