Role of Ligands on the Control of Metal-Metal Interactions in Metal Complexes

通过设计配体可以有效地控制双核和多核配合物的金属间相互作用。本课题的目的是系统地研究配体控制金属-金属相互作用的方法。该研究小组由15名成员组成，他们从不同的角度对该主题感兴趣。该研究已经进行了3年。我们已经确定了每年的主要研究领域;即第一年，“氧，羟基和烷氧桥控制金属-金属相互作用的作用。氧化物桥上的质子化与金属中心的氧化还原反应耦合，有效地控制了金属-金属相互作用。讨论了一些含有这种结构单元的生物系统。金属中心之间的磁相互作用也被广泛研究。第二年，我们的工作集中在固态金属-金属相互作用领域。目前已合成出多种硫桥新材料，并对其催化性能进行了广泛的研究。在过去的一年里，我们一直专注于设计合适的配体，以诱导金属配合物的理想性能。功能化的金属配合物如DNA相互作用、CO_2还原、含糖材料等已被开发。在整个项目研究过程中，成员之间的合作研究得到了极大的加强，发表了许多成员之间的联合论文。该研究的最初目的已经基本确立，但该领域的许多新方面也已实现。在1998年12月的最后一次会议上。我们总结了我们的研究结果，以明确未来的问题，并对未来的研究作出了新的规划。

Meta-metal interactions of di- and polynuclear complexes may be effectively controlled by designing ligands. The purpose of this research project is to study the way of controlling metal-metal interaction by ligands in a systematic way. The research group involves 15 members who are interested in the subject from various view points. The research has been carried out for 3 years. We have set main research areas for each year ; namely for first year, "role of oxo, hydroxo, and alkoxo bridges to control metal-metal interaction. The metal-metal interaction is effectively controlled by the protonation at the oxide bridge which is coupled with redox reactions at the metal centers. The discussions have been made in relation to some biological systems which contain this structural units. Magnetic interactions between metal centers have also been extensively studied. For the second year, our effort was concentrated on the area of solid state metal-metal interaction. Various sulfide bridged new materials have been obtained and their catalytic behavior was extensively studied. In the last year, we have focused to the design of ligands which are appropriate to induce desirable properties of metal complexes. Functionalized metal complexes such as DNA interactions, CO_2 reductions, and sugar-containing materials have been developed. Throughout the project research, collaborating researches between the members have been greatly encouradged and many joint papers between the members have been published. Initial purpose of the research has been largely established, but many new aspects in the field have also been realized. At the final meeting in December, 1998. we have summarized our results in order to make clear the future problems and have made new research plans for the future.