Synthesis, Physicochemical and Electrochemical Studies on Mn(II), Co(II), Ni(II), and Cu(II) Complexes with an N‐Donor Tetradentate (N4) Macrocycle Ligand Derived from Ethyl Cinnamate

Abstract Manganese(II), cobalt(II), nickel(II), and copper(II) complexes with a new tetradentate ligand, 1,3,7,9‐tetraaza‐4,10‐diketo‐6,12‐diphenyl‐2,8‐dithiocyclododecane (L), were synthesized and characterized by elemental analyses, molar conductance measurements, magnetic susceptibility measurements, mass, 1H NMR, IR, electronic, EPR spectral and cyclic voltammetric studies. On the basis of the IR, electronic, and EPR spectral studies, an octahedral geometry has been assigned for the Mn(II) and Co(II) complexes, a square‐planar one for the Ni(II) and a tetragonal one for the Cu(II) complexes.