The conversion of di-σ bonded ethylene to ethylidyne on Pt(111) monitored with sum frequency generation: evidence for an ethylidene (or ethyl) intermediate

Paul Cremer, Colin Stanners, J. W. Niemantsverdriet, Y. R. Shen, Gabor Somorjai

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Abstract

The conversion of di-σ bonded ethylene (CH2CH2) to ethylidyne (CCH3) on the Pt(111) crystal surface was monitored with infrared-visible sum frequency generation (SFG) in the ν(CH) frequency range. The conversion began around 255 K and involved a third stable species that is neither di-σ bonded ethylene nor ethylidyne. This species manifested itself as a peak at 2957 cm-1 in the vibrational spectrum. Furthermore, we found the same species present during the conversion of vinyl iodide to ethylidyne on Pt(111). The 2957 cm-1 feature has been assigned to the CH3 asymmetric stretch of ethylidene and/or ethyl.

Original languageEnglish (US)
Pages (from-to)111-118
Number of pages8
JournalSurface Science
Volume328
Issue number1-2
DOIs
StatePublished - Apr 20 1995

All Science Journal Classification (ASJC) codes

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

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