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(PiPr 3)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(P iPr3)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.
- Olefin hydrogenation
- Surface organometallic chemistry
ASJC Scopus subject areas
- Process Chemistry and Technology
- Physical and Theoretical Chemistry