Table 1. Selected Redox and Photophysical Data for [(dpab)₂Ru(4,4′-dhbpy)]²⁺ and the Monodeprotonated Complex.

	[(dpab)2Ru(4,4′-dhbpy)]2+	[(dpab)2Ru(4-O-4′-(OH)-bpy)]+	[(bpy)2Ru(4,4′-dhbpy)]2+11
E0(III/II), V vs Fc+/0	1.02	0.61	0.85
E0(III/II*), V vs Fc+/0	–0.82	–1.08	–1.05
Eem, eV	1.87	1.69	1.93
λmax,em (nm), –41 °C	665	734	642
τ0 (ns), 25 °C	615	<5	640
pKa ± 0.02	17.5	–	17.7
pKa* ± 0.02	14.4	–	15.2