Synthesis of a rhodium(I) carbonyl complex with a chiral aminodiphosphine ligand and its immobilization onto aminopropyl functionalized silica gel

Author： Das Pankaj Borah Malabika Sarmah Chandan Gogoi Pradip Alekseenko Lidia Orlyk Svetlana

Publisher： Taylor & Francis Ltd

ISSN： 0095-8972

Source： Journal of Coordination Chemistry, Vol.63, Iss.7, 2010-04, pp. : 1107-1117

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Abstract

The reaction of [Rh(CO)2(µ-Cl)]2 with two molar equivalents of a chiral ligand, (R)-N,N-bis(2-diphenylphosphinoethyl)-1-phenylethylamine(PNP*) yield a mono-carbonyl complex, [Rh(CO)Cl(η2-P,P-PNP*)] (1), in which the potentially tridentate PNP* ligand coordinates in a bidentate fashion through P,P bonding. The complex was characterized by elemental analysis, FAB mass, IR, UV-Vis, 1H- and 31P{1H}-NMR spectroscopy. Variable temperature (223-298 K) 31P{1H}-,NMR spectra of 1 showed a mixture of cis and trans isomers in the solution with the trans predominating at room temperature and the cis at lower temperature. Complex 1 was immobilized on silica through axial coordination of amine from 3-aminopropyltriethoxysilane functionalized silica. The immobilized materials were characterized by elemental analysis (N2), FTIR, DTA-TGA, N2-adsorption, XRD, and SEM analysis.