Abstract
The reaction of the silica-supported complex (SiO)(SiOX)Rh(η3-C3H5)2, where X is H or Si, with excess PiPr3 leads to the formation of the chemisorbed bis(phosphine) Rh(I) complex [SiORh(PiPr3)2]x, proposed to be dimeric (x=2) on the basis of the 31P MAS NMR spectrum. The phosphine complex irreversibly binds H2 to give a hydride complex, SiORh(PiPr3)2(H)2, characterized by IR and 31P MAS NMR spectroscopy as well as D-exchange. The coordinatively unsaturated hydride complex is inferred to be the active site for hydrogenation of olefins under mild conditions.
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