| Project/Area Number |
17350070
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials chemistry
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| Research Institution | Kyushu University |
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Principal Investigator |
KOGA Noboru Kyushu University, Graduate School of Pharmaceutical Sciences, Professor, 大学院薬学研究院, 教授 (60161890)
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| Co-Investigator(Kenkyū-buntansha) |
KARASAWA Satoru Kyushu University, Graduate School of Pharmaceutical Sciences, Associate Professor, 大学院薬学研究院, 助教授 (80315100)
AKITA Takeyuki Kyushu University, Graduate School of Pharmaceutical Sciences, Research Associate, 大学院薬学研究院, 助手 (50294963)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥14,300,000 (Direct Cost: ¥14,300,000)
Fiscal Year 2006: ¥6,900,000 (Direct Cost: ¥6,900,000)
Fiscal Year 2005: ¥7,400,000 (Direct Cost: ¥7,400,000)
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| Keywords | Single-molecule Magnets / Single-chain Magnet / Herospin System / Self-assembly / Carbene / Cobalt / 三座配位子 / オクタヘドラル / コバルト錯体 / ピリジン配位子 |
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| Research Abstract |
The studies aiming at the assemblization of single-molecule magnets (SMMs) based on the strategy of heterospin system have been proceeded. Dumbbell-type dinuclear single-molecular magnet was prepared by using the cobalt complex with tridentate pyridine ligand having dimethylamino groups at 2-and 6-position and dipyridildiazomethane (D1py_2). After irradiation, the complex showed slow magnetic relaxation characteristic to SMM in ac magnetic susceptibility measurements. However, the crystal amenable to X-ray crystal structure analysis could not be obtained. The cobalt complex obtained by mixing Co(p-tolsal)_2 and D1py_2 in 1:1 ratio, provide the SEM picture suggesting the formation of ID chains. In the dc magnetic susceptibilities measurement of the crystal sample after irradiation, the result indicating that the eight units of the cobalt ion and carbene interact ferromagnetically, was obtained. Furthermore, this cobalt complex showed a slow magnetic relaxation with U_<eff> = 87 K in ac magnetic susceptibility measurement and a hysteresis loop with H_c = 900 Oe in dc magnetic susceptibility measurement. These results indicate the formation of a ID chain. The complexes of Co(hfaci)_2, which is analogous to Co(hfac)_2, with D1py_2 and D2py_2 have a ID chain and a 2:2 cyclic structure, respectively, which were determined by X-ray structure analysis. They showed unique magnetic behaviors strongly affected by the interchain and intermolecular antiferromagntic interactions, respectively.
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