PROPERTIES OF EXCITED-STATES AND ONE-ELECTRON REDUCED FORMS OF RUTHENIUM(II)-DIIMINE PHOTOSENSITIZERS

In this paper we compare the spectral, acid-base, electrochemical, and kinetic properties of the excited states and one-electron reduced for ms of homo- and heteroleptic Ru(II)-diimine photosensitizers that cont ain 2,2'-bipyridine, 2,2'-bipyrazine, and 2,2'-bipyrimidine ligands. T hese species, represented as (RuIIIL.-)2+ and (RuIIL.-)+, respectivel y, are orbital analogues in that the intra- or intermolecularly transf erred electron resides on the same uniquely reduced ligand. The variat ions in the properties of these species, resulting from changes in the coordinating ligands, permit the fine-tuning of photochemical systems .