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Systanatic variations appear in the othphysical and photochnical properties of t4LC excited states whicth n be accounted for qualitatively or even quantitatively based on the properties of the nxlecules and of the surrounding rreditin. In 1959, Paris and Brandt first reported anission fran the cxinplex (RuUpy) (bpy is 2,2'— bipyridine) in solution (ref. 1). The excited state involved is sufficienty long-lived (-8OO ns in water at roan tanperature) that the possibility existed for using it as a thernical reagent and based on quanching studies using ccmplexes of Co(III), 1dainson and cazorkers suggested that the excited state could act as a reducing agent (ref. 2). Their suggestion was soon verified by additional quanching and flash ckiothlysis studies (ref. 3,4). It was also shawn that the excited state could act as an oxidizing agent (ref. 5), that its redox potentials could be estimated experisontally by a kinetic qunnching techniqun (ref. 6,7), and that it could undergo facile, bisolecular electron transfer with a varie of oxidants or reductants (ref. 8—10). For example, oxidative qcnching by paraquat (PQ ),

Photochemistry of metal coordination complexes: metal to ligand charge transfer excited states