Next Article in Journal
Fu et al. A New Sesquiterpene from the Fruits of Daucus carota L. Molecules 2009, 14, 2862-2867
Next Article in Special Issue
Design of Antimicrobially Active Small Amphiphilic Peptide Dendrimers
Previous Article in Journal
Ugandenial A, a New Drimane-type Sesquiterpenoid from Warburgia ugandensis
Previous Article in Special Issue
Dendrimer-Capped Nanoparticles Prepared by Picosecond Laser Ablation in Liquid Environment
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
Received: 10 August 2009; in revised form: 14 September 2009 / Accepted: 22 September 2009 / Published: 28 September 2009
(This article belongs to the Special Issue Dendrimers - from Synthesis to Applications)
Download PDF [1062 KB, uploaded 18 June 2014]
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.

Export to BibTeX |
EndNote


MDPI and ACS Style

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.

AMA Style

Fox MA, Whitesell JK, 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(10):3851-3867.

Chicago/Turabian Style

Fox, Marye A.; Whitesell, James K.; Magde, Douglas; Zhu, Lin-Yong. 2009. "The Effect of Dye Density on the Efficiency of Photosensitization of TiO2 Films: Light-Harvesting by Phenothiazine-Labelled Dendritic Ruthenium Complexes." Molecules 14, no. 10: 3851-3867.


Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert