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; P. C. Stair; M. A. Van Hove; G. A. Somorjai

doi:10.1016/0039-6028(82)90680-X

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, P. C. Stair, M. A. Van Hove, G. A. Somorjai

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

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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 language	English (US)
Pages (from-to)	85-103
Number of pages	19
Journal	Surface Science
Volume	116
Issue number	1
DOIs	https://doi.org/10.1016/0039-6028(82)90680-X
State	Published - Apr 1 1982

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/0039-6028(82)90680-X

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

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.",

author = "Koestner, {R. J.} and Frost, {J. C.} and Stair, {P. C.} and {Van Hove}, {M. A.} and Somorjai, {G. A.}",

note = "Funding Information: This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Science Division of the US Department of Energy under Contract W-4705-ENG-48. We gratefully acknowledge the very helpful technical assistance of Greg Lewis. Funding Information: * This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences Division of the US Department of Energy under Contract W-7405ENG-48. ** Permanent address: Department of Chemistry. Heriot-Watt Edinburgh, Scotland, UK. *** Permanent address: Department of Chemistry and MateriaIs Center, Northwestern sity, Evanston, Illinois 60201, USA.",

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doi = "10.1016/0039-6028(82)90680-X",

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T1 - Evidence for the formation of stable alkylidyne structures from C3 and C4 unsaturated hydrocarbons adsorbed on the pt(111) single crystal surface

AU - Koestner, R. J.

AU - Frost, J. C.

AU - Stair, P. C.

AU - Van Hove, M. A.

AU - Somorjai, G. A.

N1 - Funding Information: This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Science Division of the US Department of Energy under Contract W-4705-ENG-48. We gratefully acknowledge the very helpful technical assistance of Greg Lewis. Funding Information: * This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences Division of the US Department of Energy under Contract W-7405ENG-48. ** Permanent address: Department of Chemistry. Heriot-Watt Edinburgh, Scotland, UK. *** Permanent address: Department of Chemistry and MateriaIs Center, Northwestern sity, Evanston, Illinois 60201, USA.

PY - 1982/4/1

Y1 - 1982/4/1

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

Abstract

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