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Zoekopdracht: faculteit: "FNWI" en publicatiejaar: "2003"

AuteursS. Leroy-Lhez, C. Belin, A. D'Aleo, R.M. Williams, L. De Cola, F. Fages
TitelExtending excited-state lifetimes by interchromophoric triplet-state equilibration in a pyrene-Ru(II)diimine dyad system
TijdschriftSupramolecular chemistry
FaculteitFaculteit der Natuurwetenschappen, Wiskunde en Informatica
Instituut/afd.FNWI: Van 't Hoff Institute for Molecular Sciences (HIMS)
Trefwoordenligands; energy transfer; phosphorescence; ruthenium; pyrenes
Basisclassificatie35.16 ; 35.53
SamenvattingThe synthesis and the spectroscopic properties of a bichromophoric ruthenium trisbipyridyl-1,4-diethynylenebenzene-pyrene system (Ru-b-Py) and the corresponding pyrene ligand (b-Py) are reported. The ruthenium model systems Ru-b-OH, Ru-b-Ph are also presented. UV-Vis absorption and emission at room and low temperature and time-resolved spectroscopy are discussed. For the Ru-b-Py dyad, a mixing of the (MLCT)-M-3 state of the ruthenium-based component and the triplet state of pyrene, Py-3, is observed. Time-resolved transient absorption studies performed on the Ru-b-Py and on the b-Py ligand show that the lowest energy absorption is due to the population of the triplet state localized on the pyrene-component. Time-resolved studies also evidenced a relatively slow forward triplet equilibration rate, in the order of 2 x 10(5) s(-1) (5 mus), and an even slower back energy transfer rate, 3.3 x 10(4) s(-1), still faster than the intrinsic decay time of the pyrene (200 mus).
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