Evans Kieren J, Mansell Stephen M
Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK.
Chemistry. 2020 May 12;26(27):5927-5941. doi: 10.1002/chem.201905510. Epub 2020 Mar 18.
N-Heterocyclic carbenes (NHCs) have become immensely successful ligands in coordination chemistry and homogeneous catalysis due to their strong terminal σ-donor properties. However, by targeting NHC ligands with additional functionalisation, a new area of NHC coordination chemistry has developed that has enabled NHCs to be used to build up bimetallic and multimetallic architectures. This minireview covers the development of functionalised NHC ligands that incorporate additional donor sites in order to coordinate two or more metal atoms. This can be through the N-atom of the NHC ring, through a donor group attached to the N-atom or the carbon backbone, coordination of the π-bond or an annulated π-donor on the backbone, or through direct metalation of the backbone.
N-杂环卡宾（NHCs）因其强大的末端σ-给体性质，已成为配位化学和均相催化领域极为成功的配体。然而，通过对NHC配体进行额外官能化，一个新的NHC配位化学领域得以发展，使得NHCs可用于构建双金属和多金属结构。本综述涵盖了功能化NHC配体的发展，这些配体引入了额外的给体位点，以便与两个或更多金属原子配位。这可以通过NHC环的N原子、连接到N原子或碳骨架上的给体基团、π键或骨架上的稠合π-给体的配位，或者通过骨架的直接金属化来实现。
