Resonance Raman and lifetime studies on regioselectively deuteriated ruthenium(II) polypyridyl complexes.

Wesley R Browne, William Henry, Paolo Passaniti, Maria Teresa Gandolfi, Roberto Ballardini, Christine M O'Connor, Clare Brady, Colin G Coates, Johannes G Vos, John J McGarvey

National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin 9, Ireland.

Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 2007 Apr

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Two series of ruthenium(II) polypyridyl complexes [Ru(bipy)(2)(phpytr)](+) and [Ru(bipy)(2)(phpztr)](+) (where Hphpytr = 2-(5-phenyl-1H-[1,2,4]triazol-3-yl)-pyridine and Hphpztr = 2-(5-phenyl-1H-[1,2,4]triazol-3-yl)-pyrazine) are examined by electrochemistry, UV/Vis, emission, resonance Raman, transient resonance Raman and transient absorption spectroscopy, in order to obtain a more comprehensive understanding of their excited state electronic properties. The interpretation of the results obtained is facilitated by the availability of several isotopologues of each of the complexes examined. For the pyridine-1,2,4-triazolato based complex the lowest emissive excited state is exclusively bipy based, however, for the pyrazine based complexes excited state localisation on particular ligands shows considerable solvent and pH dependency.

Citation

Wesley R Browne, William Henry, Paolo Passaniti, Maria Teresa Gandolfi, Roberto Ballardini, Christine M O'Connor, Clare Brady, Colin G Coates, Johannes G Vos, John J McGarvey. Resonance Raman and lifetime studies on regioselectively deuteriated ruthenium(II) polypyridyl complexes. Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology. 2007 Apr;6(4):386-96