Ruthenium Seleno- and Tellurocarbonyl Complexes: Selenium and Tellurium Atom Transfer to a Terminal Carbido Ligand

The first five-coordinate selenocarbonyl complex, [RuCl2(CSe)(H2IMes)(PCy3)] (2-CSe; H2IMes = 1,3-dimesitylimidazolin-2-ylidene), and the tellurocarbonyl complex [RuCl2(CTe)(H2IMes)(dmap)2] (3-CTe; dmap = 4-(dimethylamino)pyridine) was obtained by selenium and tellurium atom transfer reaction to the carbido complex [RuCl2(C)(H2IMes)(PCy3)]. Systematic elucidation of the complete series of chalcogenocarbonyl complexes revealed that tellurocarbonyl complex 3-CTe is a potential tellurium atom transfer reagent.