Study of interfacial charge-transfer complex on TiO2 particles in aqueous suspension by second-harmonic generation

被引：165

作者：

Liu, Y ^{[1
]}

Dadap, JI ^{[1
]}

Zimdars, D ^{[1
]}

Eisenthal, KB ^{[1
]}

机构：

[1] Columbia Univ, Dept Chem, New York, NY 10027 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 13期

关键词：

D O I：

10.1021/jp984288e

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 report the first direct observation of an interfacial charge-transfer complex using second-harmonic spectroscopy. The second-harmonic spectrum of catechol adsorbed on 0.4 micron-sized TiO2 (anatase) colloidal particles in aqueous suspension reveals a charge-transfer band centered at 2.72 eV (456 nm). In addition, the adsorption isotherm of catechol on the colloidal TiO2 suspension was obtained and Save an excellent fit to the Langmuir adsorption model. From this, we infer the free energy of the adsorption to be Delta G degrees = -6.8 kcal/mol.

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页码：2480 / 2486

页数：7

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