Synthesis and Characterization of Iron(III), Cobalt(II) and Nickel(II) Metal Complexes with TaHh-DAP and TaHh-TDA Hexadentate Macrocyclic Ligands

Iron(III), cobalt(II) and nickel(II) macrocyclic metal complexes of the composition [M(L1)]Xn (n=2 or 3) and [M(L2)]Xn (n=2 or 3) (where TaHh-DAP - 2′,6-diacetylpyridine-3,4-diphenylthiophene-2,5-diacid dihydrazone (L1), TaHh-TDA = 3′,4′-diphenylthiophene-2′,5′-dialdehydo-3,4-diphenylthiophene-2,5-diacid dihydrazone (L1), M = iron(III) or cobalt(II) or nickel(II), X = Cl or NO3 − or OAc or SO4 −) were synthesised and characterised on the basis of elemental analyses, conductance measurements, magnetic susceptibility, DSC thermograms and IR spectral data.