Novel Co(II) metal complexes of N, O donor salicyloylpyrazoleoxime Schiff bases: synthesis, spectroscopic studies and antimicrobial evaluation

Abstract

Five novel mononuclear Co(II) chelate complexes derived from salicyloylpyrazoleoximes have been synthesized and characterized using elemental analysis, spectroscopic methods (UV-visible, IR, 1H NMR) and thermal analysis. The elemental analysis suggests that the Schiff Base Co(II) complexes have 1:2 stoichiometry. The spectroscopic determination suggest the complexes are square planer and the Schiff base coordinate to Co(II) metal through imine nitrogen and phenolic oxygen. All synthesized complexes are stable, non-hygroscopic, non-electrolytic and amorphous in nature. Most of the ligands and Co(II) complexes possess moderate antimicrobial activity against the test bacteria.