INIFTA   05425
INSTITUTO DE INVESTIGACIONES FISICO-QUIMICAS TEORICAS Y APLICADAS
Unidad Ejecutora - UE
artículos
Título:
Reversible Multi-Electron Reduction of 9,11,20,22-tetraaza-tetrapyridopentacene (tatpp) as Axial Ligand in the [(bpy)2Ru(tatpp)]Cl2 Complex
Autor/es:
R. O. LEZNA; N.R. DE TACCONI; JANARATNE, T.; MUÑOZ, JACKELINE; F.M. MACDONNELL
Revista:
Journal of the Argentine Chemical Society
Editorial:
Asociación Química Argentina
Referencias:
Lugar: Buenos Aires; Año: 2009 vol. 97 p. 273 - 288
ISSN:
0365-0375
Resumen:
The ruthenium complex, [(bpy)2Ru(tatpp)]2+ (12+; bpy is 2,2’-bipyridine where tatpp is9,11,20,22-tetraaza tetrapyrido[3,2-a:2’3’-c:3”,2”-l:2”’,3”’]-pentacene) is a promising candidate forhomogeneous solar photocatalysis, based on the coupling of light absorption by the (bpy)2Ru2+chromophore moiety with the tatpp ability to receive and reversible store electrons in aqueousmedia. In the present communication, a combination of spectroelectrochemistry and voltammetrywas applied to compare the electroreduction processes of tatpp in complex 12+ and as a Zn-tatppadduct. For complex 12+, the radical [(bpy)2Ru(tatpp•-)]+(1•+) is the first electroreduced species thatthen converts to doubly-reduced, single-protonated [(bpy)2Ru(Htatpp-)]+ (H1+) and doublyprotonated[(bpy)2Ru(H2tatpp)]2+(H212+) by subsequent electron transfer (ET) and proton transfer(PT) reactions. Contrastingly, spectroelectrochemistry of the Zn-tatpp adduct showed negligible