Evidence for the formation of stable alkylidyne structures from C3 and C4 unsaturated hydrocarbons adsorbed on the pt(111) single crystal surface

R. J. Koestner, J. C. Frost, Peter C Stair, M. A. Van Hove, G. A. Somorjai

Research output: Contribution to journalArticle

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Abstract

C3 and C4 hydrocarbon (methylacetylene, propylene, and the 2-butenes) adsorption on the Pt(111) face was studied by observing the LEED patterns that formed and by measuring the intensity versus voltage spectra for each structure. Two phases exist for each of these molecules adsorbed on the Pt(111) surface. At low temperatures, the unsaturated C-C group forms a di-σ bond to two Pt atoms. Upon warming to about room temperature, and in the presence of hydrogen for the alkynes, a conversion takes place to an alkylidyne species that is bonded to three Pt atoms and has its C-C bond nearest to the metal substrate oriented perpendicularly to the surface. The butylidyne species is shown to order its ethyl group into an (8×8) or (2 32 3)R30° superlattice when the hydrocarbon exposure is increased; this ordering is probably a natural consequence of the steric hindrance among neighboring ethyl groups as the hydrocarbon coverage increases slightly with larger exposures.

Original languageEnglish
Pages (from-to)85-103
Number of pages19
JournalSurface Science
Volume116
Issue number1
DOIs
Publication statusPublished - Apr 1 1982

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Single crystal surfaces
Hydrocarbons
crystal surfaces
hydrocarbons
single crystals
Atoms
Alkynes
butenes
alkynes
propylene
Butenes
Propylene
atoms
Hydrogen
Metals
Adsorption
Temperature
Molecules
adsorption
heating

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces

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Evidence for the formation of stable alkylidyne structures from C3 and C4 unsaturated hydrocarbons adsorbed on the pt(111) single crystal surface. / Koestner, R. J.; Frost, J. C.; Stair, Peter C; Van Hove, M. A.; Somorjai, G. A.

In: Surface Science, Vol. 116, No. 1, 01.04.1982, p. 85-103.

Research output: Contribution to journalArticle

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AU - Frost, J. C.

AU - Stair, Peter C

AU - Van Hove, M. A.

AU - Somorjai, G. A.

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N2 - C3 and C4 hydrocarbon (methylacetylene, propylene, and the 2-butenes) adsorption on the Pt(111) face was studied by observing the LEED patterns that formed and by measuring the intensity versus voltage spectra for each structure. Two phases exist for each of these molecules adsorbed on the Pt(111) surface. At low temperatures, the unsaturated C-C group forms a di-σ bond to two Pt atoms. Upon warming to about room temperature, and in the presence of hydrogen for the alkynes, a conversion takes place to an alkylidyne species that is bonded to three Pt atoms and has its C-C bond nearest to the metal substrate oriented perpendicularly to the surface. The butylidyne species is shown to order its ethyl group into an (8×8) or (2 32 3)R30° superlattice when the hydrocarbon exposure is increased; this ordering is probably a natural consequence of the steric hindrance among neighboring ethyl groups as the hydrocarbon coverage increases slightly with larger exposures.

AB - C3 and C4 hydrocarbon (methylacetylene, propylene, and the 2-butenes) adsorption on the Pt(111) face was studied by observing the LEED patterns that formed and by measuring the intensity versus voltage spectra for each structure. Two phases exist for each of these molecules adsorbed on the Pt(111) surface. At low temperatures, the unsaturated C-C group forms a di-σ bond to two Pt atoms. Upon warming to about room temperature, and in the presence of hydrogen for the alkynes, a conversion takes place to an alkylidyne species that is bonded to three Pt atoms and has its C-C bond nearest to the metal substrate oriented perpendicularly to the surface. The butylidyne species is shown to order its ethyl group into an (8×8) or (2 32 3)R30° superlattice when the hydrocarbon exposure is increased; this ordering is probably a natural consequence of the steric hindrance among neighboring ethyl groups as the hydrocarbon coverage increases slightly with larger exposures.

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