title: Electrochromic devices based on binuclear mixed valence compounds adsorbed on nanocrystalline semiconductors.
abstract: A series of cyano-bridged binuclear mixed valence complexes of the general formula M-Ru(III)(NH(3))(4)pyCOOH [pyCOOH = isonicotinic acid; M = cis-Ru(bpy)(2)(CN)(2), 1 (bpy = 2,2' bipyridine); trans-Ru(py)(4)(CN)(2), 2 (py = pyridine); [Ru(CN)(6)](4)(-), 3; [Fe(CN)(6)](4)(-), 4] have been prepared and anchored through the carboxylic function to nanocrystalline TiO(2) or SnO(2) electrodes. The complexes display a reversible electrochromic behavior in the range of applied potential from -0.5 to +0.5 V, versus SCE. Tuning of the electronic transitions in the visible and near-infrared spectral regions is achieved through changes of the solvent and of the cyano-bridged metal moiety M.
authors.affiliation: Dipartimento di Chimica and I.S.O.F., Università di Ferrara, Via L. Borsari, 46, Ferrara, Italy.
authors.forename: Matteo
authors.initials: M
authors.lastname: Biancardo
authors.forename: Peter F H
authors.initials: PF
authors.lastname: Schwab
authors.forename: Roberto
authors.initials: R
authors.lastname: Argazzi
authors.forename: Carlo Alberto
authors.initials: CA
authors.lastname: Bignozzi