Synthesis of novel metal-germavinylidene complexes from bisgermavinylidene

摘要

The bisgermavinylidene [(Me3SiN=PPh2)(2)C=Ge -> Ge=C(PPh2=NSiMe3)(2)] (1) has been used as the source of unstable germavinylidene for the synthesis of a series of metal-germavinylidene complexes. Treatment of 1 with M(PPh3)(4) (M = Ni, Pd) afforded the metal-germavinylidene complexes [{(Me3SiN=PPh2)(2)C=Ge}(2)Ni(PPh3)2] (2) and [{(Me3SiN=PPh2)(2)C= Ge-mu(2)}Pd(PPh3)](2) (3), respectively. The germavinylidene moiety from 1 acts as a two-electron terminal and bridging ligand, respectively. Similar reaction of I with AgCl or AuI gave [(Me3SiN=PPh2)(2)C=Ge(Ag)(Cl)](2) (5) and [(Me3SiN=PPh2)(2)C=Ge(Au)(I)](2) (6), respectively. The result has shown that the germavinylidene moiety from I behaves as a Lewis base and undergoes an insertion reaction into the metal-halogen bond. X-ray structures of 2, 3, 5, and 6 have been determined.