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

Fox, Marye; Whitesell, James; Magde, Douglas; Zhu, Lin-Yong

doi:10.3390/molecules14103851

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

Journal Article · 28 September 2009 · Molecules

DOI: https://doi.org/10.3390/molecules14103851 · OSTI ID:1628470

Fox, Marye ^[1]; Whitesell, James ^[2]; Magde, Douglas ^[2]; Zhu, Lin-Yong ^[3]

Univ. of California, San Diego, CA (United States). Dept. of Chemistry and Biochemistry; DOE/OSTI
Univ. of California, San Diego, CA (United States). Dept. of Chemistry and Biochemistry
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Photographic Chemistry

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.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division

Grant/Contract Number:: FG02-05ER15748

OSTI ID:: 1628470

Journal Information:: Molecules, Journal Name: Molecules Journal Issue: 10 Vol. 14; ISSN MOLEFW; ISSN 1420-3049

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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

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