title: Resonance Raman and lifetime studies on regioselectively deuteriated ruthenium(II) polypyridyl complexes.
abstract: 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.
authors.affiliation: National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin 9, Ireland.
authors.forename: Wesley R
authors.initials: WR
authors.lastname: Browne
authors.forename: William
authors.initials: W
authors.lastname: Henry
authors.forename: Paolo
authors.initials: P
authors.lastname: Passaniti
authors.forename: Maria Teresa
authors.initials: MT
authors.lastname: Gandolfi
authors.forename: Roberto
authors.initials: R
authors.lastname: Ballardini
authors.forename: Christine M
authors.initials: CM
authors.lastname: O'Connor
authors.forename: Clare
authors.initials: C
authors.lastname: Brady
authors.forename: Colin G
authors.initials: CG
authors.lastname: Coates
authors.forename: Johannes G
authors.initials: JG
authors.lastname: Vos
authors.forename: John J
authors.initials: JJ
authors.lastname: McGarvey
mesh_terms: D003903:Deuterium / Q000737:chemistry; D004563:Electrochemistry; D004583:Electrons; D008024:Ligands; D049449:Luminescence; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000737:chemistry*; D010777:Photochemistry; D011725:Pyridines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013237:Stereoisomerism; D013696:Temperature
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D011725:Pyridines; C521233:bis(2,2'-bipyridine)(2-(5-phenyl-1H-(1,2,4)triazol-3-yl)pyrazine)ruthenium(II); C521232:bis(2,2'-bipyridine)(2-(5-phenyl-1H-(1,2,4)triazol-3-yl)pyridine)ruthenium(II); D012428:Ruthenium; D003903:Deuterium