Polymetallacarborane Stacks and Clusters: Designed Synthesis and Electronic Properties

该奖项来自无机、生物无机和有机金属化学项目，支持合成含有过渡金属、硼和碳簇的新型有机金属化合物。本研究有两个主要目标：开发含碳硼烷和二硼醇的多金属配合物的系统制备路线，并研究这些材料的电子结构和性能。首先将开发一层一层地构建多层三明治的方法，然后是将这些分子连接在一起的技术。此外，还将制备一些锇和钌的独立金属碳硼烷，以测试一些金属插入反应，这些反应可以提供多面体扩展的替代方式。在所有情况下，化合物将使用核磁共振、可见-紫外光谱、x射线晶体学、循环伏安法和ESR光谱等技术进行结构和电化学表征。设计和合成沿链具有高电子导电性的类链分子是一个非常活跃的研究领域，因为这类分子在分子级电子器件中具有潜在的用途。这个项目涉及到分子的合成，其中金属原子由碳原子和硼原子组成的五元环连接在一起，结构类似于多层三明治，五元环充当“面包”，金属原子充当“肉”。金属原子之间的通信提供了电子上下传导的堆叠。硼的存在提供了高的热稳定性和降低了对大气氧氧化的敏感性。

This award from the Inorganic, Bioinorganic, and Organometallic Chemistry Program supports the synthesis of new organometallic compounds containing transition metals and boron and carbon clusters. The research has two main goals: to develop systematic preparative routes to polymetallic complexes containing carboranes and diborols and to investigate the electronic structures and properties of these materials. Methods to construct multi-decker sandwiches layer by layer will first be developed, followed by techniques for linking those molecules together. In addition, some indenylmetallacarboranes of osmium and ruthenium will be prepared in order to test some metal insertion reactions which could provide an alternative mode of polyhedral expansion. In all cases, the compounds will be characterized both structurally and electrochemically, using techniques such as NMR, vis-UV spectroscopy, X-ray crystallography, cyclic voltammetry, and ESR spectroscopy. %%% The design and synthesis of chain-like molecules which have high electronic conductivities along the chain is a very active area of research because of the potential use of such molecules in molecular level electronic devices. This project involves the synthesis of molecules in which metal atoms are linked by five-membered rings of carbon and boron atoms in structures which resemble multi-decker sandwiches, with the five-membered rings serving as the "bread" and the metal atoms as the "meat." Communication between the metal atoms provides for conduction of electrons up and down the stack. The presence of boron provides high thermal stability and decreased sensitivity to oxidation by atmospheric oxygen.