Abstract
The results of experiments are described in which a series of sequential electron-transfer reactions are induced by oxidative or reductive quenching of the emitting charge transfer (CT) excited state of Ru(bpy)/sub 3//sup 2 +/ (bpy is 2,2' = bipyridine). The excited state is shown to have the innate properties of electronic charge separation and ability to undergo facile electron and electron-hole loss which allow it to mimic the behavior expected of a photodiode at the molecular level. By adding a chemically linked electron acceptor to the basic chromophore, as in the complex ((bpy)/sub 2/Ru(NC/sub 5/H/sub 4/C/sub 5/H/sub 4/NCH/sub 3/)/sub 2/)/sup 4 +/, it is possible to introduce a directed charge-transfer character to the excited state.
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