Spectroscopic, Structural and Electrical Conductivity Studies of Co(II), Ni(II) and Cu(II) Complexes derived from 4-Acetylpyridine with Thiosemicarbazide

Co(II), Ni(II) and Cu(II) complexes with novel heterocyclic ligands derived from 4-acetylpyridine with thiosemicarbazide were synthesized and characterized by elemental analysis, molar conductivity, spectral methods (mid infrared, 1H-NMR, mass and UV/vis. spectra) and simultaneous thermal analysis (TG/DTG) techniques. The molar conductance measurements proved that all complexes are electrolytes compared with their ligands. The IR spectra of the two ligands and their complexes are used to identify the type of bonding. The kinetic thermodynamic parameters such as: E*, ΔH*, ΔS* and ΔG* are estimated from the DTG curves. The electrical conductivity properties were measured in the temperature range 298-473 K and the activation energy of metal complexes was estimated. The free ligands and their complexes have been studied for their possible biological activity (antibacterial and antifungal).