Transition metal complexes with thiosemicarbazide-based ligands. Part 47. Synthesis, physicochemical and voltammetric characterization of iron(Ⅲ) complexes with pyridoxal semi-, thiosemi- and S-methylisothiosemicarbazones

摘要

The reaction of warm EtOH solutions of FeX_3·nH_2O (X = Cl, NO_3) with tridentate ONX (X = O, S, N) pyridoxal semi-, thiosemi- and S-methylisothiosemi-cabazones (H_2L~1, H_2L~2, H_2L~3, respectively) yielded high-spin octahedral mono- and bis(ligand) complexes of the formula [Fe(H_2L~(1-3))Cl_2(H_2O)]Cl, [Fe(HL~(1,2))_2]Cl·nH_2O and [Fe(H_2L~3)(HL~3)](NO_3)_2·H_2O. The compounds were characterized by elemental analysis, conductometric and magnetochemical measurements. IR and UV-Vis spectra. Besides, a detailed voltammetric study of the complexes was carried out in DMF solution in the presence of several supporting electrolytes, to characterize the nature of the electrode processes and solution equilibria.