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A bistable electrochromic material based on a hysteretic molecular switch immobilised on nanoparticulate metal oxide
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Photochemistry and Molecular Science.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Photochemistry and Molecular Science.
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2008 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 18, no 47, 5824-5829 p.Article in journal (Refereed) Published
Abstract [en]

Combination of an electrochemically bistable Ru polypyridyl complex (2) with the metal oxide semiconductor Sb:SnO2 formed the basis of an electrochromic hybrid material characterised by a hysteretic response to applied potential. The electrochemical bistability of the molecular component arises from redox-triggered linkage isomerisation where an ambidentate ligand changes reversibly between N- and O-coordination in the Ru(II) and Ru(III) states, respectively. Reversible oxidation and reduction result in a pronounced electrochromic effect (change in UV-Vis absorption at the metal-to-ligand-charge- transfer (MLCT) band) and the potentials for interconversion between the states are separated by similar to 0.5 V due to the linkage isomerisation reactions. With a carboxylate anchoring group on the auxiliary ligand, the bistable molecular switch was immobilised on the surface of nanoparticulate Sb:SnO2 films. This resulted in an electrode material featuring a hysteretic electrochemical response where oxidation state and colour of the electrode depended on the electrochemical history of the system.

Place, publisher, year, edition, pages
2008. Vol. 18, no 47, 5824-5829 p.
National Category
Chemical Sciences
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URN: urn:nbn:se:uu:diva-129288DOI: 10.1039/b810768hISI: 000261745400016OAI: oai:DiVA.org:uu-129288DiVA: diva2:342814
Available from: 2010-08-11 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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Lomoth, Reiner

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