IR study of the effects of Lewis bases on CO coadsorbed on Pt/SiO2

J. Sárkány, M. Bartók

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4 Citations (Scopus)

Abstract

The indirect interactions of organic compounds containing one or two sp3 hybridized O atoms with CO preadsorbed in linear form on 5% Pt/SiO2 were studied by transmission infrared (IR) spectroscopy. The measured red shifts in v(CO) suggested that these electron-donor compounds (EDC) were adsorbed on Pt by dative bonds via one or two O atoms. The results were interpreted as follows: at high τEDC, the effects on the increase in the electron density on the CO 2π* orbital were more important than those on the CO-CO interactions. However, at low τEDC, the absorbance, the integrated absorbance and the half-width of the IR band of CO(A) displayed some unusual features. These were attributed to the local dipolar decouplings ofCO(A) molecules in islands. Not only τEDC, but also τCO (local) greatly influenced the variations in ν(CO) and in the CO band shape, and according to the interpretation above, the relative importance of the electronic (chemical) features and the dipole-dipole interactions. Other theories were also considered.

Original languageEnglish
Pages (from-to)109-111
Number of pages3
JournalVacuum
Volume40
Issue number1-2
DOIs
Publication statusPublished - 1990

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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