The degree of delocalization in the symmetrical complexes [{Ru(bpy)₂}₂(μ-dpb′)]⁵⁺ and [{Ru(bpy)₂}₂(μ-dpb)]⁵⁺ (dpb = 2,3-bis(2-pyridyl)-1,4-benzoquinoxaline; dpb′ = dipyrido(2,3-a;3′,2′-c)benzophenazine; bpy = 2,2′-bipyridine) is diminished by the substitution of the terminal bpy ligands at one end of the complex. The results of a classical analysis for the diastereoisomeric forms of the series of complexes [{Ru(bpy)₂}(μ-BL){Ru(pp)₂}]⁵⁺ (pp = bpy, Me₂bpy (4,4′-dimethyl-2,2′-bipyridine), Me₄bpy (4,4′,5,5′-tetramethyl-2,2′-bipyridine)) indicate that a greater degree of ground-state delocalization exists in the complexes incorporating the bridging ligand dpb′ compared with the dpb analogue. A two-state analysis in which ΔE ₀ (the redox asymmetry) is varied at constant H _ab (the electronic coupling) and λ (the reorganizational energy) does not adequately describe the properties of the systems due to the importance of a third electronic state corresponding to the bridging ligand.