Investigations of the potential-dependent structure of phenylalanine on the glassy carbon electrode by infrared-visible sum frequency generation

被引：21

作者：

Kim, J

Chou, KC

Somorjai, GA ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2002年 / 106卷 / 36期

关键词：

D O I：

10.1021/jp0208541

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：

We investigated the structure of adsorbed L-phenylalanine (Phe) on the glassy carbon electrode (GCE) as a function of electrode potential using infrared-visible sum frequency generation (SFG) vibrational spectroscopy. Experiments using partially deuterated Phe confirmed that SFG signal originates from the CH stretch modes of the methylene group (CH2) in Phe. Quantitative analysis of SFG spectra revealed that Phe molecules adopt a conformation in which the dipole contribution of the asymmetric mode of the methylene group becomes greater than the symmetric mode with respect to the surface normal at highly positive electrode potential.

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页码：9198 / 9200

页数：3

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