Novel Ru-Dioxolene Complexes as Potential Electrochromic Materials and NIR Dyes

A series of Ru(bpy)2−dioxolene complexes 1−4 (bpy = 2,2‘- bipyridine) and corresponding Ru(dcb)2−dioxolene complexes 5−8 (dcbH2 = 2,2‘-bipyridine-4,4‘-dicarboxylic acid) have been prepared, and their spectroelectrochemical behavior in solution has been investigated. The complexes show reversible ele...

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Bibliographic Details
Published in:Inorganic chemistry 2003-10, Vol.42 (21), p.6613-6615
Main Authors: Schwab, Peter F. H, Diegoli, Sara, Biancardo, Matteo, Bignozzi, Carlo Alberto
Format: Article
Language:English
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Summary:A series of Ru(bpy)2−dioxolene complexes 1−4 (bpy = 2,2‘- bipyridine) and corresponding Ru(dcb)2−dioxolene complexes 5−8 (dcbH2 = 2,2‘-bipyridine-4,4‘-dicarboxylic acid) have been prepared, and their spectroelectrochemical behavior in solution has been investigated. The complexes show reversible electrochemical behavior accompanied by a strong NIR absorption in their semiquinone forms due to a Ru(dπ) → sq(π*) MLCT band. Complete quenching of the NIR absorption occurs both upon oxidation (to the quinone form) and upon reduction (to the catechol form) very close to 0 V. The color of the systems can be tuned by using a wide range of ligands. The complexes 5−8 can be anchored onto nanocrystalline inorganic semiconductors allowing incorporation into potential electrochromic devices. As a proof of principle, compound 8 has been adsorbed on nanocrystalline Sb-doped SnO2 supported on FTO glass, and it displays reversibly switchable electrochromic behavior in the NIR.
ISSN:0020-1669
1520-510X
DOI:10.1021/ic0346782