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Transition metal complexes with thiosemicarbazide-based ligands, Part 49: New complexes of iron(III) with deprotonated tridentate Schiff base - pyridoxal derivatives

Jovanović Ljiljana S. (Faculty of Science, Novi Sad, Serbia and Montenegro)
Jevtović Violeta S. (Faculty of Science, Novi Sad, Serbia and Montenegro)
Leovac Vukadin M. (Faculty of Science, Novi Sad, Serbia and Montenegro)
Bjelica Luka J. (Faculty of Science, Novi Sad, Serbia and Montenegro)

Three new bis(ligand) iron(III) complexes were prepared with the deprotonated ONX ligands (X = O,S,N), pyridoxal semi-, thiosemi- and S-methylisothiosemicarbazones (H2L1, H2L2 and H2L3, respectively) of the formulas [Fe(HL1,2)L1,2].4H2O and [Fe(HL3)2]OAc.2H2O. The compounds were characterized by elemental analysis, conductometric and magnetochemical measurements, as well as by IR and UV-vis spectra. Detailed voltammetric investigations were carried out in DMF solutions in the presence of several supporting electrolytes to study the nature of the electrochemical processes and solution equilibria.

Keywords: iron(III) complexes, pyridoxal semi-, thiosemi- and isothiosemicarbazones, deprotonated ligands, voltammetric studies