Stabilization of ArSiH sub(4) super(-) and SiH sub(6) super(2-) Anions in Diruthenium Si--H sigma -Complexes

Hydridosilicate anions ([ArSiH sub(4)] super(-) and [SiH sub(6)] super(2-)) were stabilized as ligands in diruthenium Si--H sigma -complexes [{(PhBP super(Ph) sub(3))Ru} sub(2)( mu -Cl)( mu - eta super(3), eta super(3)-H sub(4)SiAr)] (Ar=2-MeOC sub(6)H sub(4), Mes, Ph) and [{(PhBP super(Ph) sub(3))Ru} sub(2)( mu - eta super(4), eta super(4)-H sub(6)Si)] (see picture). These complexes were formed under mild conditions and characterized by single-crystal X-ray diffraction (see picture), NMR and IR spectroscopy, and computational techniques.