PHOTOREDOX REACTIONS OF TRIS(2,2'-BIPYRAZINE)RUTHENIUM(II), TRIS(2,2'-BIPYRIMIDINE)RUTHENIUM(II) AND TRIS(2,3-BIS[2-PYRIDYL]PYRAZINE)RUTHENIUM(II) CATIONS WITH PHENOLATE IONS IN AQUEOUS ACETONITRILE
P. Thanasekaran et al., PHOTOREDOX REACTIONS OF TRIS(2,2'-BIPYRAZINE)RUTHENIUM(II), TRIS(2,2'-BIPYRIMIDINE)RUTHENIUM(II) AND TRIS(2,3-BIS[2-PYRIDYL]PYRAZINE)RUTHENIUM(II) CATIONS WITH PHENOLATE IONS IN AQUEOUS ACETONITRILE, Journal of the Chemical Society. Faraday transactions (Print), 94(22), 1998, pp. 3339-3344
Citations number
67
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
The photoinduced electron transfer (PET) reactions of six Ru(II) compl
exes with several phenolate ions have been measured in 50% aqueous ace
tonitrile (v/v) and the observed quenching constant (k(q)) values are
sensitive to the nature of the ligand and the structure of the phenola
te ion. A steric effect seems to play an important role in this PET re
action. The temperature dependence study of the quenching of [Ru(bpy)
(3)](2+) with ArO- reveals that the unfavourable entropy values associ
ated with bulky quenchers are responsible for the observed steric effe
ct. The change of k(q) values with Delta G degrees is in accordance wi
th the semiclassical theory of electron transfer.