40 years of transition-metal thiocarbonyl chemistry and the related CSe and CTe compounds

This present review covers the development of the chemistry of transition metal complexes with the 10-electron systems CE (E = S, Se, Te). For thiocarbonyl complexes a comprehensive update starting from an earlier summary presented by Broadhurst in 1985 is given; seleo- and tellurocarbonyle compounds are completely reviewed. Priorities are set up on new pathways to these compounds and chemical reactions in which the title ligands are involved. Whereas the thiocarbonyl ligand exhibits a broad spectrum of bonding modes similar to carbonyl chemistry (terminal or various bridging modes), the higher homologues are limited to terminal coordination. On the basis of about 50 crystal structure analyses more insight into bonding parameters are now available. A further section is dedicated to theoretical calculations focused on the description of the electronic properties and bond energies mainly of coordinated CS. May this review simulate further investigation into this area of chemistry.