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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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 languageEnglish
Pages (from-to)2480-2486
Number of pages7
JournalJournal of Physical Chemistry B
Issue number13
Publication statusPublished - 1999


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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