Homogeneous Catalysis of the Water Gas Shift Reaction by Bridged Dinuclear Pyrazolate Rhodium Complexes. FT-IR, 1H and 13C NMR In Situ Studies |
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| Authors: | A J Pardey M Fernández M A Moreno J Alvarez A B Rivas M C Ortega B Mendez P J Baricelli and C Longo |
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| Institution: | (1) Facultad de Ciencias, Escuela de Química, Universidad Central de Venezuela, Caracas, Venezuela;(2) Centro de Investigaciones Químicas, Facultad de Ingeniería, Universidad de Carabobo, Valencia, Venezuela;(3) Centro de Investigación y Desarrollo de Radiofármacos, Facultad de Farmacia, Universidad Central de Venezuela, Caracas, Venezuela |
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| Abstract: | Homogeneous catalysts for the water gas shift reaction prepared from Rh2( -Pz)2(COD)2 (Pz = pyrazolate ion and COD = 1,5-cyclooctadiene) in aqueous organic solvent media (pyridine, 4-picoline or 2-ethoxyethanol) and Rh2(-Pz)2(CO)2(TPPMS)2 (TPPMS = meta-sulfonatophenyl-diphenyldiphosphine) in acidic aqueous media under mild conditions are described. In situ FT-IR, 1H and 13C NMR spectroscopic studies of the Rh2(-Pz)2(COD)2 catalytic system reveal the presence of hydrido-Rh complexes with linear and bridging carbonyls. These complexes also catalyze the reduction of nitrobenzene to aniline. |
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| Keywords: | Rhodium pyrazolate water gas shift reaction carbon monoxide |
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