A spectroscopic study of the coordination of dimethyl sulfoxide to a platinum (111) surface

B. A. Sexton, N. R. Avery, T. W. Turney

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Abstract

Spectroscopic studies of the adsorption of dimethyl sulfoxide, (CH3)2S = O, on Pt(111) have shown that the molecule is bound to the surface via the sulfur atom in an inverted pyramid configuration. A comparison of XPS and EELS data for the adsorbed multilayer and monolayer with XPS and infrared data on the complex PtCl2(DMSO)2 is consistent with sulfur bonding. In addition, we detect a considerable increase of the v(S=O) frequency in the DMSO monolayer with decreasing coverage, indicating a coverage dependent heat of adsorption. UPS data show that on adsorption to form a monolayer, the highest occupied molecular orbital of DMSO, presumably the sulfur "lone pair" orbital, shifts to a higher binding energy. These results show a remarkable similarity between DMSO bonding to a metal surface and bonding to a single Pt2+ species.

Original languageEnglish
Pages (from-to)162-174
Number of pages13
JournalSurface Science
Volume124
Issue number1
DOIs
Publication statusPublished - 1 Jan 1983
Externally publishedYes

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