Synthesis, characterization and thermal behavior of copper(II) complexes with pyridoxal thiosemi (PLTSC)- and S-methylisothiosemicarbazone (PLITSC)

The syntheses of complexes of Cu(II) with biological active ligand, pyridoxal thiosemicarbazone (PLTSC) and its derivative, pyridoxal S -methylisothiosemicarbazone, are described. All coordination compounds were characterized by elemental analysis, molar conductivity and infrared spectra. The crystal and molecular structure of complexes [{Cu(μ-PLTSC)(H 2 O)} 2 ](SO 4 ) 2 ·6H 2 O ( 2 ) and [{Cu(μ-PLTSC)(H 2 O)} 2 ](SO 4 ) 2 ·2H 2 O ( 2a ) is determined by single-crystal X-ray crystallography, too. The thermal decomposition of all the ligands and complexes was determined by simultaneous TG/DSC measurements. The decomposition mechanisms were compared and analyzed from the aspects of the relationships between the structures of the compounds and their thermal decomposition pattern.