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Quenching of excited tris(2,2'-bipyridine)ruthenium(II) by metal 1,2-dithiolene complexes

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100401a043· OSTI ID:5598538
The quenching of excited Ru(bpy)/sub 3//sup 2 +/ by MS/sub 4/C/sub 4/(C/sub 6/H/sub 5/)/sub 4/ and MS/sub 4/C/sub 4/(CN)/sub 4//sup 2 -/ (M = Ni, Pt) has been studied in CH/sub 3/CN and DMF. The dynamic quenching rate constants, which are nearly diffusion controlled, have been analyzed in terms of diffusional parameters and unimolecular quenching constants. The unimolecular quenching constants for the MS/sub 4/C/sub 4/(CN)/sub 4//sup 2 -/ quenchers are lower by 2 orders of magnitude than those for the MS/sub 4/C/sub 4/(C/sub 6/H/sub 5/)/sub 4/ quenchers, and this effect has been attributed to a different degree of adiabaticity. The quenching mechanism has been investigated by using sacrificial scavengers for oxidized or reduced (Ru(bpy)/sub 3//sup 2 +/. Evidence for oxidative quenching by the MS/sub 4/C/sub 4/(C/sub 6/H/sub 5/)/sub 4/ complexes was obtained. For the MS/sub 4/C/sub 4/(CN)/sub 4//sup 2 -/ quenchers, either energy transfer or reductive electron transfer followed by very efficient cage recombination is a possible quenching mechanism. 48 references, 4 figures, 2 tables.
Research Organization:
Universita and Centro di Fotochimica C.N.R., Ferrara, Italy
OSTI ID:
5598538
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:10; ISSN JPCHA
Country of Publication:
United States
Language:
English