Design and spectroscopic study of new ruthenium(II) complexes containing ligands derived front terpyridine and dipyrido[3,2-a:2?,3?-c] phenazine: Ru(4? -Rph-tpy) [dppz(COOH)]Cl}PF 6 with R = NO 2, Br, Cl

Lopez R.; MOYA, S. A.; Zúñiga C.; Yañez M.; Bayon J.C.; Aguirre P.

Keywords: oxidation, ruthenium, complexes, electrochemistry, absorption, acids, ligand, light, ph, spectrophotometry, effects, phenylterpyridine, compounds, carboxylic, Dipyridophenazine

Abstract

A series of polypyridine ruthenium complexes of the general formula {Ru(Rph-tpy)[dppz(COOH)]Cl} PF 6 with R = Br (1), Cl (2), NO 2 (3) where Rph-tpy is 4?-(4-Rphenyl-2,2?:6?, 2?-terpyridine and dppz(COOH) is dipyrido[3,2-a:2?,3?-c] phenazine-2-carboxylic acid were prepared and characterized. These complexes display intense metal-to-ligand charge-transfer (MLCT) bands centered about 500 nm. The effect of pH on the absorption spectra of these complexes consisting of protonatable ligands has been investigated in water solution by spectrophotometric titration. The electrochemistry shows oxidation potentials for the Ru(II)-Ru(III) couple at +0.881 (1), +0.907 (2) and +0.447 V (3), respectively. Copyright © 2006 John Wiley & Sons, Ltd.

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Título de la Revista: APPLIED ORGANOMETALLIC CHEMISTRY
Volumen: 20
Número: 5
Editorial: Wiley
Fecha de publicación: 2006
Página de inicio: 315
Página final: 321
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-33744811386&partnerID=q2rCbXpz