Metal complexes in inorganic matrices: Pert III. Catalytic activity of Rh(CO)Cl(PR 3) 2 heterogenised by the SOL-GEL method

Abstract

The catalytic activity of Rh(CO)Cl(PPh 2CH 2CH 2SiO 3/2 2· xSiO 2, (catalyst P), prepared by the polycondensation of Rh(CO)Cl[PPh 2CH 2CH 2Si(OEt) 3] 2 ( H) with tetraethoxysilane is compared with that of the homogeneous compound H and with catalyst S, prepared by attaching H to the surface of SiO 2. In the hydrosilylation of 1-hexene with triphenylsilane, P and S exhibit similar catalytic activities. In the absence of an olefin, P is an effective catalyst for the formation of poly- and oligo-siloxanes from hydrosilanes. P also catalyses CO oxidation and the water-gas shift reaction. Qualitative trends between the catalytic activity of P and its physical properties are discussed.