RAMAN-SPECTROSCOPY OF 4-(METHYLTHIO)BENZOIC ACID ADSORBED ON SILVER SURFACES

被引：41

作者：

KWON, YJ ^{[1
]}

LEE, SB ^{[1
]}

KIM, K ^{[1
]}

KIM, MS ^{[1
]}

机构：

[1] SEOUL NATL UNIV,COLL NAT SCI,DEPT CHEM,SEOUL 151742,SOUTH KOREA

来源：

JOURNAL OF MOLECULAR STRUCTURE | 1994年 / 318卷

基金：

新加坡国家研究基金会;

关键词：

D O I：

10.1016/0022-2860(93)07889-5

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 surface-enhanced Raman scattering of 4-(methylthio)benzoic acid has been investigated in aqueous silver sol and at a silver electrode. The molecule was found to adsorb on the silver surface via its sulfur atom and carboxylate group after deprotonation. The electrochemically produced 4-sulfidobenzoate was similarly found to be adsorbed on the silver. The symmetric stretching mode of the carboxylate anion (COO-) was found to be down-shifted by 6-10 cm-1 from that in the free state when adsorption occurs via the pi system of the carboxylate group. The mode should red-shift further by lowering the surface potential. However, the peak position of the less intense delta(COO-) mode seemed to be insensitive to variation in the surface potential. The asymmetric stretching mode of the carboxylate group appeared, on the contrary, to be inactive in this bonding scheme.

引用

页码：25 / 35

页数：11

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