Time-Resolved Optical Spectroscopy of Heterosupramolecular Assemblies Based on Nanostructured TiO2 Films Modified by Chemisorption of Covalently Linked Ruthenium and Viologen Complex Components

Alan Merrins; Cees Kleverlaan; Geoffrey Will; S. Nagaraja Rao; Franco Scandola; Donald Fitzmaurice

doi:10.1021/jp004343v

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Time-Resolved Optical Spectroscopy of Heterosupramolecular Assemblies Based on Nanostructured TiO2 Films Modified by Chemisorption of Covalently Linked Ruthenium and Viologen Complex Components

Journal article

Peer reviewed

Time-Resolved Optical Spectroscopy of Heterosupramolecular Assemblies Based on Nanostructured TiO2 Films Modified by Chemisorption of Covalently Linked Ruthenium and Viologen Complex Components

Alan Merrins, Cees Kleverlaan, Geoffrey Will, S. Nagaraja Rao, Franco Scandola and Donald Fitzmaurice

The Journal of Physical Chemistry Part B, Vol.105(15), pp.2998-3004

2001

DOI: https://doi.org/10.1021/jp004343v

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Abstract

cations

charge transfer

nanocrystals

oxides

pyridines

Described is the preparation of transparent nanostructured TiO2 (anatase) and Sb-doped SnO2 films supported on F-doped conducting glass. Also described is the modification of these films by chemisorption of RV, bis(4,4‘-bis(phosphonomethyl)-2,2‘-bipyridine)(5-((1‘-ethyl-4,4‘-bipyridinediium-1-yl)butyl)-2,2‘-bipyridine)ruthenium(II) tetrakis(hexafluorophosphate), to form the covalent heterosupramolecular assemblies TiO2-RV and SnO2-RV, respectively. Visible light excitation of the ruthenium complex component, R, results in electron injection into the TiO2 or SnO2:Sb nanocrystal component (60%) and electron transfer to the viologen component (40%), V. In the case of TiO2-RV, however, long-lived formation of the radical cation of the V component, V•+, is observed. In the case of SnO2-RV, long-lived formation of V•+ is not observed. These findings, based on a detailed study of the time-resolved optical spectroscopy of TiO2-RV and SnO2:Sb-RV, are accounted for by proposing that long-lived V•+ is formed by TiO2 nanocrystal mediated electron transfer to the V component.

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Title: Time-Resolved Optical Spectroscopy of Heterosupramolecular Assemblies Based on Nanostructured TiO2 Films Modified by Chemisorption of Covalently Linked Ruthenium and Viologen Complex Components
Authors: Alan Merrins (Author) - University College Dublin
Cees Kleverlaan (Author) - University College Dublin
Geoffrey Will (Author) - University College Dublin
S. Nagaraja Rao (Author) - University College Dublin
Franco Scandola (Author) - University of Ferrara
Donald Fitzmaurice (Corresponding Author) - University College Dublin
Publication details: The Journal of Physical Chemistry Part B, Vol.105(15), pp.2998-3004
Publisher: American Chemical Society
DOI: 10.1021/jp004343v
ISSN: 1520-5207
Organisation Unit: School of Science, Technology and Engineering
Language: English
Record Identifier: 99737878902621
Output Type: Journal article

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