The phosphinated complexes RuCl2(PPh3)3, 1, RhCl(PPh3)3, 2, IrCl(CO)(PPh3)2, 3, their water soluble sulfonated analogs RuCl2[Ph2P(3-C6H4SO 3Na)]2 · 4H2O, 4, RhCl[Ph2P(3-C6H4SO3Na)]3 · 4H2O, 5, IrCl(CO)[Ph2P(3-C6H4SO3Na)] 2, 6, as well as the dirhodium compounds trans-[Rh(CO)(PPh3)(μ-pz)]2, 7, and trans-[Rh(CO)(PPh3)(μ-Cl)]2, 9 were entrapped physically in SiO2 sol-gel matrices. Replacement of the PPh3 ligands in the two latter complexes by Ph2P(CH2)2Si(OEt)3 groups enabled to bind of the dirhodium complexes chemically to the matrix backbone via the silyloxy functions. The activity of the immobilized complexes as allylbenzene isomerization catalysts was studied and compared. Entrapped complex 4 was found to be the most efficient catalyst.
ASJC Scopus subject areas
- Process Chemistry and Technology
- Physical and Theoretical Chemistry