Vibrational frequencies of the methoxy groups in the cluster compounds [Re2(mu2-OCH3)3(CO)6] [P(C6H5)4] and [Re3(mu2-H)3(mu3-OCH3)(CO)9][N{P(C6H5)3}2] are assigned using selective deuterium substitution. The nu(s)(CH3) and rho(CH3) modes were found to be the most sensitive to the state of coordination of the methoxy group. A comparison of the cluster data with RAIRS data for methanol adsorbed on Cu(100) and Cu(111) single crystal faces provides a unifying model for the surface methoxy species. This consists of mu2-coordinated methoxy groups tilted to the surface normal on both surfaces at low coverage, but with the tilt angle decreasing with higher surface coverage.

VIBRATIONAL ASSIGNMENTS FOR METHOXY LIGANDS ON METAL-CLUSTERS - INTERPRETATION OF RAIRS DATA FROM METHOXY GROUPS ON SINGLE-CRYSTAL COPPER SURFACES / U. JAYASOORIYA, C. ANSON, O. ALJOWDER, G. D'ALFONSO, P. STANGHELLINI, R. ROSSETTI. - In: SURFACE SCIENCE. - ISSN 0039-6028. - 294:1-2(1993), pp. 131-140.

VIBRATIONAL ASSIGNMENTS FOR METHOXY LIGANDS ON METAL-CLUSTERS - INTERPRETATION OF RAIRS DATA FROM METHOXY GROUPS ON SINGLE-CRYSTAL COPPER SURFACES

G. D'ALFONSO;
1993

Abstract

Vibrational frequencies of the methoxy groups in the cluster compounds [Re2(mu2-OCH3)3(CO)6] [P(C6H5)4] and [Re3(mu2-H)3(mu3-OCH3)(CO)9][N{P(C6H5)3}2] are assigned using selective deuterium substitution. The nu(s)(CH3) and rho(CH3) modes were found to be the most sensitive to the state of coordination of the methoxy group. A comparison of the cluster data with RAIRS data for methanol adsorbed on Cu(100) and Cu(111) single crystal faces provides a unifying model for the surface methoxy species. This consists of mu2-coordinated methoxy groups tilted to the surface normal on both surfaces at low coverage, but with the tilt angle decreasing with higher surface coverage.
Settore CHIM/03 - Chimica Generale e Inorganica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/187397
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