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Molecules 2009, 14(10), 3851-3867; doi:10.3390/molecules14103851
Article

The Effect of Dye Density on the Efficiency of Photosensitization of TiO2 Films: Light-Harvesting by Phenothiazine-Labelled Dendritic Ruthenium Complexes

1,* , 1
, 1
 and 2
1 Department of Chemistry and Biochemistry, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0358, USA 2 Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing 100101, China
* Author to whom correspondence should be addressed.
Received: 10 August 2009 / Revised: 14 September 2009 / Accepted: 22 September 2009 / Published: 28 September 2009
(This article belongs to the Special Issue Dendrimers - from Synthesis to Applications)
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Abstract

A family of dendritic tris-bipyridyl ruthenium coordination complexes incorporating two or four carboxylate groups for binding to a TiO2 surface site and another dendritic linker between the metal complex and highly absorptive dyes were formulated as thin films on TiO2 coated glass. The family included phenothiazine-substituted dendrons of increasing structural complexity and higher optical density. The dye-loaded films were characterized by steady-state emission and absorption measurements and by kinetic studies of luminescence and transient absorption. Upon photoexcitation of the bound dyes, rapid electron injection into the metal oxide film was the dominant observed process, producing oxidized dye that persisted for hundreds of milliseconds. Complex decay profiles for emission, transient absorption, and optical bleaching of the dendritic dyes point to highly heterogeneous behavior for the films, with observed persistence lifetimes related directly to structurally enhance electronic coupling between the metal oxide support and the dendritic dyes.
Keywords: photosensitization; light-harvesting; ruthenium; dendrimers photosensitization; light-harvesting; ruthenium; dendrimers
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fox, M.A.; Whitesell, J.K.; Magde, D.; Zhu, L.-Y. The Effect of Dye Density on the Efficiency of Photosensitization of TiO2 Films: Light-Harvesting by Phenothiazine-Labelled Dendritic Ruthenium Complexes. Molecules 2009, 14, 3851-3867.

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