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Electrochromic Behaviour of Polynuclear Ruthenium Complexes on Nanocrystalline SnO2

2003; Wiley-VCH; Volume: 68; Issue: 9 Linguagem: Inglês

10.1135/cccc20031710

1212-6950

Matteo Biancardo, Peter Schwab, Carlo Alberto Bignozzi,

Porphyrin and Phthalocyanine Chemistry

The trinuclear [{Ru(NH 3 ) 4 (py-COOH)}(μ-CN){Ru(bpy) 2 }(μ-CN){Ru(NH 3 ) 4 (py-COOH)}] 6+ (py-COOH = isonicotinic acid, bpy = 2,2'-bipyridine) ( 1 ) and dinuclear [{Ru(dcb) 2 } 2 L] 7- (dcb = 2,2'-bipyridine-4,4'-dicarboxylic acid, H 3 L = 9-phenyl-2,3,7-trihydroxy-6-fluorone) ( 2 ) complexes were prepared and their spectroelectrochemical behaviour characterised in solution and on conductive glass electrodes layered with Sb-doped nanocrystalline SnO 2 . The systems display a reversible redox response in a narrow potential range (-0.5 to +0.5 V vs SCE) and offer the possibility of controlling colour changes of electrochromic devices through variations of the coordinated and bridging ligands at the metal centres. SnO 2 (Sb) electrodes loaded with these dyes show switching times of the order of ms.