Mono- and bimetallic complexes of Os(II) with the planar bis-bidentate nitrogen aromatic heterocyclic ligand dipyrido[2,3-a:2 ’,3 ’-h]phenazine(dpop) have been prepared and studied. Electronic absorption results show Os(d pi) --> dpop(pi*) MLCT transitions are at lower energy than MLCT transitions previously reported for similar Os(II) complexes. Cyclic voltammetry studies confirm the low energy transitions as MLCT processes. and Delta E(2 - 1) for the bimetallic complex indicates larger Os(d pi)-dpop(pi*) orbital mixing occurs than has been previously observed. The spectroelectrochemical result for the mixed valence bimetallic ion is in agreement with that obtained by chemical oxidation, and two IT absorptions are observed.