权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Preparation and Assemblization of Highly Functionalized Organic Magnetic Molecules

高功能化有机磁性分子的制备与组装

基本信息

批准号：
09640626
负责人：
IZUOKA Akira
金额：
$ 1.73万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

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.

有机磁性金属的开发是分子磁学研究的热点之一。在这样的自旋系统中，传导电子和局域自旋之间需要自旋相关。我们设计了一系列的开壳层给体分子，作为这种自旋系统的候选分子。开壳层给体由一个给体和一个自由基单元构成，当单电子氧化发生时，它们连接成交叉共轭π-体系。我们制备了两个由两个硝酰基氮氧自由基和一个噻蒽自由基组成的开壳给体异构体（2，7-和2，8-异构体）。SQUID测量表明，这些异构体分别为基态三重态和中性单重态。ESR研究表明，它们通过单电子氧化将基态多重性从三重态和单重态变为四重态。还制备了三种基于TTF的开壳供体。循环伏安和ESR测试表明，这些给体具有与母体给体相似的给体能力和开壳层给体的电子性质。这些结果表明，这些开壳层给体满足有机磁性金属组分所需的条件之一。由这些自由基组成的混合价自由基离子盐的制备正在进行中。