Synthesis and electronic coupling studies of cyclometalated diruthenium complexes bridged by 3,3′,5,5′-tetrakis(benzimidazol-2-yl)-biphenyl

Electrochemical and intervalence charge-transfer studies suggest that when the same or similar terminal ligands are used, the strength of the bridging ligand in mediating the Ru–Ru coupling decreases in the order of tpbp > H-tbibp > Me-tbibp.