pi-bonded ethene on Pt(111) surface studied by IRAS

被引：40
|
作者：
Kubota, J
Ichihara, S
Kondo, JN
Domen, K
Hirose, C
机构：
[1] Res. Lab. of Resources Utilization, Tokyo Institute of Technology, Yokohama, 226, 4259 Nagatsuta, Midori-ku
来源：
SURFACE SCIENCE | 1996年 / 357卷 / 1-3期
关键词：
alkenes; chemisorption; infrared absorption spectroscopy; low index single crystal surfaces; models of surface chemical reactions; platinum; solid-gas interfaces;
D O I：
10.1016/0039-6028(96)00236-1
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：
Adsorption of ethene on clean and ethylidyne-covered Pt(111) surfaces was investigated by infrared reflection absorption spectroscopy (IRAS). Under gaseous ethene of similar to 10(-3) Pa, pi-bonded ethene was reversibly formed on a Pt(111) surface saturated with di-sigma-bonded ethene at 112 K. The pi-bonded ethene gave infrared absorption peaks at 954 and 3090 cm(-1) which were assigned to =CH2 wagging (out-of-plane) and CH2 asymmetric stretching modes, respectively. These two peaks indicated that the pi-bonded ethene was adsorbed on Pt(111) in such a way that the molecular plane is tilted with respect to the surface while the C=C bond is being kept parallel to the surface. The intensity of the C-H stretching band at 2908 cm(-1) of di-sigma-bonded ethene decreased with the increase of pi-bonded ethene. The heat of adsorption of pi-bonded ethene was estimated to be 40 +/- 10 kJ/mol. The presence of ethylidyne with saturation coverage was found to inhibit the pi-bonded ethene adsorption.
引用
收藏
页码：634 / 638
页数：5
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