1998 Fiscal Year Final Research Report Summary
Preparation and Assemblization of Highly Functionalized Organic Magnetic Molecules
| Project/Area Number |
09640626
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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 |
Organic chemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
IZUOKA Akira The University of Tokyo, Graduate School of Arts and Sciences, Reserch Associate, 大学院・総合文化研究科, 助手 (90193367)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Organic Magnetic Metal / High Spin Molecule / Ferromagnetic Exchange Interaction / Donor / Radical / Electron Transfer / Electron Spin Resonance (ESR) |
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| Research Abstract |
Development of organic magnetic metals is one of the most interest investigation for molecular magnetism. In such spin system, it is required a spin correlation between conduction electrons and local spins. We designed a series of open-shell donors which are candidate molecules as components of such spin system. The open shell donors are constructed with a donor and a radical unit and they are connected so as to become a cross-conjugate pi-system when one-electron oxidation takes place. We prepared two open-shell donor isomers (2,7- and 2,8-isomer) composed of two nitronyl nitroxides as radical unit and a thianthrene as a donor unit. SQUID measurements showed that these isomers are ground state triplet and singlet in neutral state, respectively. The ESR study showed that they changes the ground state multiplicity from triplet and singlet to both quartet through one-electron oxidation. Three TTF-based open-shell donors were also prepared. Cyclic voltammetry and ESR measurement indicate that these donors have a similar donor ability to the mother donors and the electronic character as the open-shell donor. These results indicate that these open-shell donors satisfy one of required conditions for the components of organic magnetic metals. Preparations of mixed valent radical ion salts composed of these radicals are in progress.
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