Electrochemical Studies on Metal–Metal Interactions in Bismacrocyclic Ni(II) Complexes

Studies on five Ni(II) complexes, i.e., 7,7′-polymethylenebis[2,12-dimethyl-3,7,11,17-tetraazabicyclo[11.3.1]heptadeca-1(17),2,11,13,15-pentaene]dinickel(II) per-chlorates with polymethylene bridges of 2–6-C length, by cyclic voltammetry and differential pulse polarography, have revealed that the half-wave potentials of the [NiIINiII]/[NiIINiIII] and [NiIINiIII]/[NiIIINiIII] couples are not changed among the hexa- to tetramethylene derivatives but shifted toward the positive side in the following order: tetramethylene