Time-resolved resonance Raman spectroscopic studies of the photosensitization of colloidal titanium dioxide

Umapathy, S. ; Cartner, A. M. ; Parker, A. W. ; Hester, R. E. (1990) Time-resolved resonance Raman spectroscopic studies of the photosensitization of colloidal titanium dioxide The Journal of Physical Chemistry, 94 (26). pp. 8880-8885. ISSN 0092-7325

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Official URL: http://pubs.acs.org/doi/abs/10.1021/j100389a007

Related URL: http://dx.doi.org/10.1021/j100389a007

Abstract

Resonance Raman and time-resolved resonance Raman spectroscopies have been used to study the surface interactions of substituted bipyridyl complexes of ruthenium (II) as sensitizers with the colloidal semiconductor TiO2. It has been shown that the adsorption of ruthenium (II) tris([2,2'-bipyridyl]-4,4'-dicarboxylate) (RB4H) onto a colloidal TiO2 surface is through the solvation layer, whereas cis-diaquaruthenium (II) bis([2,2'-bipyridyl]-4,4'-dicarboxylate) (RBDA) adsorption is via the water ligands of the complex. The transient Raman spectrum of the metal-ligand charge-transfer triplet excited state of the ethyl ester of RB4H is reported. Analysis of the spectrum provides conclusive evidence for the excited electron being localized on one of the ligands The photosensitization of TiO2 by RB4H and RBDA has also been studied by using time-resolved resonance Raman spectroscopy.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:64986
Deposited On:15 Oct 2011 12:29
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