A bistable electrochromic material based on a hysteretic molecular switch immobilised on nanoparticulate metal oxide
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
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.
IdentifiersURN: urn:nbn:se:uu:diva-129288DOI: 10.1039/b810768hISI: 000261745400016OAI: oai:DiVA.org:uu-129288DiVA: diva2:342814