Chemisorption bond energies of Lewis acids and bases on chemically modified Mo(100) surfaces

J. E. Deffeyes, A. Horlacher Smith, Peter C Stair

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The acid-base properties of three molybdenum (100) surfaces chemically modified by 1.0 monolayers of oxygen, 1.0 monolayers of carbon and 0.8 monolayers of sulfur were investigated by thermal desorption spectroscopy using a series of molecular Lewis bases. The molecules used were of two types, lone pair bases, ammonia, phosphine, dimethyl ether and carbon monoxide, and olefinic bases, ethene, propene and 3,3,3-trifluoropropene. Carbon monoxide and 3,3,3-trifluoropropene were also capable of functioning as π acids. The trends in desorption energies are consistent with the expectation that the more electronegative oxygen creates more highly acidic adsorption sites. The desorption energies are compared with proton affinities. Of the three surfaces studied the acidity of the oxygen modified surface correlates best with the acidity of a gas phase proton.

Original languageEnglish
Pages (from-to)517-533
Number of pages17
JournalApplied Surface Science
Volume26
Issue number4
DOIs
Publication statusPublished - Oct 1 1986

    Fingerprint

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this