Coordination Chemistry of Cyclic Disilylated Germylenes and Stannylenes with Group 11 Metals

Reactions of Et3P adducts
of bissilylated germylenes and stannylenes with gold, silver, and
copper cyanides led to cyanogermyl or -stannyl complexes of the respective
metals. In the course of the reaction the phosphine moved to the metal,
while the cyanide migrated to the low-coordinate group 14 element.
The respective gold complexes were found to be monomeric, whereas
the silver and copper complexes exhibited a tendency to dimerize in
the solid state. Attempts to abstract the phosphine ligand with B­(C6F5)3 led only to the formation of adducts
with the borane coordinating to the cyanide nitrogen atom.