Charge separation in donor-chromophore-acceptor complexes : inverted region behavior in reverse electron transfer reactions

Time-resolved absorption studies which elucidate intramolecular electron transfer rates have been performed on a series of covalently linked Ru(bipyridine) 3 -donor-acceptor complexes. In these complexes the electron donor is a phenothiazine moiety linked to a bipyridin by a (-CH 2 -) 4 chain, and the electron acceptor is an N,N'-diquaternary-2,2'-bipyridinium moiety, linked to a bipyridine by a (-CH 2 -) 2 chain