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

Abstract

Three new bis(ligand) iron(III) complexes were prepared with the deprotonated ONX ligands (X = O,S,N), pyridoxal semi-, thiosemi- and S-methylisothiosemicarbazones (H 2 L 1 , H 2 L 2 and H 2 L 3 , respectively) of the formulas [Fe(HL 1,2 )L, 1,2 ]· 4H 2 O and [Fe(HL 3 ) 2 ]OAc·2H 2 O. 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.