Synthesis and Characterization of an Amidinate-Stabilized Siladithiocarboxylate and Its Germanium(II) Complex

The synthesis and characterization of the amidinate-stabilized potassium siladithiocarboxylate [{LSi(S)2}K(THF)2]2 (2, L = PhC(NBut)2) are described. Compound 2 was synthesized by the reaction of [LSiCl] (1) with two equivalents of elemental sulfur and KC8 in THF. X-ray crystallography and DFT calculations show that the Si–S bond lengths in 2 are intermediate between the SiS double and Si–S single bond lengths. There is a weak electronic delocalization along the “Si(S)2” skeleton. Compound 2 underwent a salt elimination reaction with GeCl2·dioxane to form [{LSi(S)2}2Ge:] (3), which contains two “LSi(S)2–” moieties chelating to the germanium(II) atom in an anisobidentate manner.