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

Yan Liu; J. I. Dadap; David Zimdars; Kenneth B. Eisenthal

doi:10.1021/jp984288e

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

Yan Liu, J. I. Dadap, David Zimdars, Kenneth B. Eisenthal

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170 Scopus citations

Abstract

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 gave an excellent fit to the Langmuir adsorption model. From this, we infer the free energy of the adsorption to be ΔG° = -6.8 kcal/mol.

Original language	English (US)
Pages (from-to)	2480-2486
Number of pages	7
Journal	Journal of Physical Chemistry B
Volume	103
Issue number	13
DOIs	https://doi.org/10.1021/jp984288e
State	Published - Apr 1 1999
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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

abstract = "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 gave an excellent fit to the Langmuir adsorption model. From this, we infer the free energy of the adsorption to be ΔG° = -6.8 kcal/mol.",

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AU - Liu, Yan

AU - Dadap, J. I.

AU - Zimdars, David

AU - Eisenthal, Kenneth B.

PY - 1999/4/1

Y1 - 1999/4/1

N2 - 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 gave an excellent fit to the Langmuir adsorption model. From this, we infer the free energy of the adsorption to be ΔG° = -6.8 kcal/mol.

AB - 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 gave an excellent fit to the Langmuir adsorption model. From this, we infer the free energy of the adsorption to be ΔG° = -6.8 kcal/mol.

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JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

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ER -

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

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