THE CONVERSION OF DI-SIGMA BONDED ETHYLENE TO ETHYLIDYNE ON PT(111) MONITORED WITH SUM-FREQUENCY GENERATION - EVIDENCE FOR AN ETHYLIDENE (OR ETHYL) INTERMEDIATE

Authors
CREMER P STANNERS C NIEMANTSVERDRIET JW SHEN YR SOMORJAI G
Citation
P. Cremer et al., THE CONVERSION OF DI-SIGMA BONDED ETHYLENE TO ETHYLIDYNE ON PT(111) MONITORED WITH SUM-FREQUENCY GENERATION - EVIDENCE FOR AN ETHYLIDENE (OR ETHYL) INTERMEDIATE, Surface science, 328(1-2), 1995, pp. 111-118
Citations number
28
Categorie Soggetti
Chemistry Physical
Journal title
Surface science → ACNP
ISSN journal
00396028
Volume
328
Issue
1-2
Year of publication
1995
Pages
111 - 118
Database
ISI
SICI code
0039-6028(1995)328:1-2<111:TCODBE>2.0.ZU;2-T
Abstract
The conversion of di-sigma bonded ethylene (-CH2-CH2-) to ethylidyne ( =CCH3) on the Pt(111) crystal surface was monitored with infrared-visi ble sum frequency generation (SFG) in the nu(CH) frequency range. The conversion began around 255 K and involved a third stable species that is neither di-sigma bonded ethylene nor ethylidyne. This species mani fested itself as a peak at 2957 cm(-1) in the vibrational spectrum, Fu rthermore, we found the same species present during the conversion of vinyl iodide to ethylidyne on Pt(111). The 2957 cm(-1) feature has bee n assigned to the CH3 asymmetric stretch of ethylidene and/or ethyl.