PERSULFATE QUENCHING OF THE EXCITED-STATE OF RUTHENIUM(II) TRIS-BIPYRIDYL DICATION - THERMAL-REACTIONS

Authors
HENBEST K DOUGLAS P GARLEY MS MILLS A
Citation
K. Henbest et al., PERSULFATE QUENCHING OF THE EXCITED-STATE OF RUTHENIUM(II) TRIS-BIPYRIDYL DICATION - THERMAL-REACTIONS, Journal of photochemistry and photobiology. A, Chemistry, 80(1-3), 1994, pp. 299-305
Citations number
25
Categorie Soggetti
Chemistry Physical
Journal title
Journal of photochemistry and photobiology. A, Chemistry → ACNP
ISSN journal
10106030
Volume
80
Issue
1-3
Year of publication
1994
Pages
299 - 305
Database
ISI
SICI code
1010-6030(1994)80:1-3<299:PQOTEO>2.0.ZU;2-V
Abstract
The rate constant for the reaction between the sulphate radical (SO4.- ) and the ruthenium(II) tris-bipyridyl dication (Ru(bipy)3(2+)) is (3. 3+/-0.2) X 10(9) mol-1 dm3 s-1 in 1 mol dm-3 H2SO4 and (4.9+/-0.5) X 1 0(9) mol-1 dm3 s-1 in 0.1 mol dm-3, pH 4.7 acetate buffer. The SO4.- r adical produced by the electron transfer quenching of Ru(bipy)3(2+) b y S2O8(2-) reacts rapidly with both acetate buffer and chloride ions. These side reactions result in a reduction in the overall quantum yiel d of Ru(bipy)3(3+) production and reduced reaction selectivity when Ru (bipy)3(2+) is quenched by persulphate.