Homoleptic Two-Coordinate 14-Electron Palladium and Platinum Complexes with Two Bis(guanidinato)silylene Ligands

The homoleptic transition-metal bis(silylene) complexes [{{iPrNC(NiPr2)NiPr}(2)Si}(2)M] (7: M = Pd; 8: M = Pt) were synthesized by treatment of [PdCl2(SMe2)(2)] and [PtCl2(PiPr(3))(2)], respectively, with the bis(guanidinato)silylene [iPrNC(NiPr2)NiPr](2)Si (2). The almost linearly coordinated Pd-0 and Pt-0 complexes 7 and 8 are two-coordinate 14-electron transition-metal species and represent unprecedented four-coordinate silicon(II) compounds with SiMN3 skeletons (M = Pd, Pt). Compound 8 is the first two-coordinate bis(silylene)platinum complex.