Tuning the energy of the NIR absorption of dinuclear triphos-cobalt-complexes

Dinuclear Co(III) complexes of the type [(triphos)Co(C(6)X(2)Z(1)Z(2)Z(3)Z( 4))Co(triphos)](2+) (Z(1-4) = O, NR, S; R = H, Me; X = H, Cl, Br, I; 1 - 6( 2+)) have been prepared and characterized by MS IR, NMR, cyclovoltammetric and UV/VIS/NIR measurements and by X-ray analyses (1(2+), 3a(2+) and 4(2+)) . Their redox behaviour and the energy of their low energy LMCT bands was s tudied and compared to the properties of the mononuclear complexes [(tripho s)Co(C(6)H(4)Z(1)Z(2))](+) (Z(1-2) = O, NH, S).