配位不饱和双核钴配合物的合成、表征与反应性质研究

配位不饱和金属物种是许多金属催化反应的关键中间体。对配位不饱和金属物种的结构和反应性质的研究对于揭示相关反应机理和发展高效、高选择新反应具有价值。钴配合物在金属有机催化和有机合成等领域具有广泛的应用，引起了人们的密切关注。针对目前配位不饱和双核钴配合物研究较少，结构与反应性质之间关联认知不清等科学问题，本项目拟利用氮杂环卡宾立体和电子性质的可调控性，实现一系列氮杂环卡宾配位的不饱和双核钴配合物的合成和表征，探索氮杂环卡宾配体的立体和电子性质对配合物合成和结构的影响；探索配位不饱和双核钴配合物与惰性小分子和含不饱和键等有机底物的反应，认知金属中心的价态、电子结构和自旋态等因素对反应化学的规律性影响，建立配合物结构与性质之间的关联。

Coordinatively unsaturated species have been regarded as key intermediates of various catalytic transformations mediated by organometallic species. The study on the structure and reactivity of coordinatively unsaturated metal species is of great value to reveal the relevant reaction mechanism and develop efficient and high-selective new reactions. Cobalt complexes have been widely used in organic catalysis and organic synthesis, which has attracted close attention. In view of the scientific problems that there are few studies on the structure and reactivity of coordinatively unsaturated binuclear cobalt complexes, this project intends to use the controllability of the steric hindrance of N-heterocyclic carbenes to achieve the synthesis and characterization of a series of coordinatively unsaturated binuclear cobalt complexes with N-heterocyclic carbenes ligation. The effects of steric hindrance of N-heterocyclic carbenes on the synthesis and structure of complexes will be investigated subsequently. The reactions of coordinatively unsaturated binuclear cobalt complexes with inert small molecules and organic substrates containing unsaturated bonds were explored. The regular effects of valence state, electronic structure and spin state of metal center on reactivity were recognized, and the correlation between structure and reactivity will be established.