Ru-Complexes of an anionic germabenzenyl ligand

Abstract

Ruthenium complexes having an anionic germabenzenyl ligand, [Cp*Ru{η¹,η³-GeC₅(t-Bu)H₄}]₂ (1) and [Cp*Ru{η¹-GeC₅(t-Bu)H₄}{[η¹,η⁵-GeC₅(t-Bu)H₄]RuCp*}₂] (2), have been synthesized by the reaction of germabenzenylpotassium, KGeC₅(t-Bu)H₄, with [Cp*RuCl]₄. Complexes 1 and 2 exhibit both σ- and π-type coordination and can be regarded as the first examples of a transition-metal substituted benzenoid of heavier Group 14 elements. The isolated complexes 1 and 2 have been characterized using NMR and UV-vis spectroscopy, X-ray crystallographic analysis, and theoretical calculations.