“…25 The capability of reducing CO 2 to CO has been found in a variety of transition metal complexes, ranging from 3d metals to heavier ones. 9,10,[26][27][28][29][30] Nickel, the metal that interests us in this work, has been widely applied to this problem. [Ni(II) cyclam]Cl 2 (cyclam = 1,4,8,11-tetra-azacyclotetradecane) was reported to electrochemically reduce CO 2 in an efficient way in 1984, the process being still favourable in water, since water reduction was much slower.…”