The design of metal complexes with ligands that have multiple protonation states has significant implications in tuning the reactivity of the metal center.  Hydroxylated bipyridine ligands have been utilized for this purpose in catalyzing varying redox reactions.   We report here the synthesis of [Ru(bpy)2(66'bpy(OH)2)]2+ (bpy = 2,2'-bipyridine; 66'bpy(OH)2 = 6,6'-dihydroxy-2,2'-bipyridine), a metal complex with two deprotonatable groups located ortho to the coordinating nitrogens.  The complex has been studied for the influence of the protonation state on its electronic properties.  Electrochemical studies, UV/visible absorption and luminescence spectroscopy will be reported.  These results are directly comparable to [Ru(bpy)2(44'bpy(OH)2)]2+ (44'bpy(OH)2 = 4,4'-dihydroxy-2,2'-bipyridine), reported previously by our group, where the hydroxyl groups are located para to the coordinated nitrogen.

Synthesis and electronic properties of [Ru(bpy)2(66'bpy(OH)2)]2+ (bpy = 2,2'-bipyridine; 66'bpy(OH)2 = 6,6'-dihydroxy-2,2'-bipyridine)

244th National Meeting (2012)

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