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Mixed-ligand bivalent transition metal ion complexes with N -ethyl-2-picolinoyl hydrazinecarbothioamide (EPHC) and 1,10-phenanthroline (1,10-phen) have been synthesized. The complexes namely [Cu(EPHC)(1,10-phen)(Cl)H 2 O] (1), [Ni(EPHC)(1,10-phen)(Cl)H 2 O] (2), [Mn(EPHC)(1,10-phen)(Cl)H 2 O] (3) and [Co(EPHC)(1,10-phen)(Cl)H 2 O] (4) were characterized by elemental analysis, spectral (IR, 1 H NMR and UV-Vis) and magnetic moment measurements. The magnetic and spectral data indicates octahedral structure for all complexes. Metal complexes have been modeled using parameterized PM3 semi-empirical method. The free ligand and its M(II)-chelates have been screened for their antimicrobial activities. The antibacterial screening demonstrated that, the Cu(II) complex have the maximum and broad activities among the investigated complexes.

Characterization and biological activity studies on some transition metal complexes of thiosemicarbazide derived from 2-picolinic acid hydrazide