Synthesis, Characterization, and X-ray Structural Analysis of Diplatinum Complexes Containing Bridging μ-SiHAr Ligands, {(PhnMe3-nP)2Pt[μ-SiHAr]}2 [n = 0−2; Ar = 2-isopropyl-6-methyl(phenyl)]

Reaction of (IMP)SiH 3 with (Ph n Me 3 - n P) 2 PtMe 2 at 50 °C provided the dinuclear complexes trans -[(Ph n Me 3 - n P) 2 Pt(μ-SiHAr)] 2 [Ar = 2-isopropyl-6-methylphenyl (IMP)]. These complexes were characterized by multinuclear NMR and IR spectroscopy and X-ray crystallography. The 29 Si NMR chemical shift for {(PhMe 2 P) 2 Pt[μ-SiH(IMP)]} 2 appears at unusually high field (−134 ppm) for complexes containing bridging silylene moieties. The X-ray structures of these complexes reveal acute Si−Pt−Si and obtuse Pt−Si−Pt angles. In solution, {(Ph 2 MeP) 2 Pt[μ-SiH(IMP)]} 2 undergoes dissociation of PMePh 2 down to −90 °C.