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

被引：152
作者：
CREMER, P
STANNERS, C
NIEMANTSVERDRIET, JW
SHEN, YR
SOMORJAI, G
机构：
[1] UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DEPT CHEM, DIV SCI MAT, BERKELEY, CA 94720 USA
[2] UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DEPT PHYS, DIV MAT SCI, BERKELEY, CA 94720 USA
[3] EINDHOVEN UNIV TECHNOL, SCHUIT INST CATALYSIS, 5600 MB EINDHOVEN, NETHERLANDS
来源：
SURFACE SCIENCE | 1995年 / 328卷 / 1-2期
关键词：
ETHYLIDYNE; SUM FREQUENCY GENERATION;
D O I：
10.1016/0039-6028(94)00820-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The conversion of di-sigma bonded ethylene (-CH2-CH2-) to ethylidyne (=CCH3) on the Pt(111) crystal surface was monitored with infrared-visible 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 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.
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页码：111 / 118
页数：8
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