Synthesis, structure and biological activity of Cu(II), Ni(II), Co(II) complexes with N-[2-[(E)-2-furylmethylaminomethyl)phenyl]-4-methyl-benzenesulfamide

Synthesized N-[2-[(E)-2-furylmethyliminomethyl)phenyl]-4-methyl-benzenesulfamide (HL) and complexes of Cu(II), Ni(II), Co(II) based on its ML2 composition. The composition, structure, and spectral properties of the obtained compounds were studied using elemental analysis, 1H NMR (for HL), IR spectroscopy, and electron absorption spectroscopy. The crystal structure of Cu(II), Ni(II), and Co(II) complexes was determined by X-ray diffraction (CCDC No. 2420740, 2420738, and 2420739, respectively). It is shown that two deprotonated ligands are chelated coordinated to metal ions by nitrogen atoms of the tosylamine and azomethine fragments of the ligand. The geometry of the surroundings of copper(II), nickel(II), and cobalt(II) ions corresponds to a strongly distorted tetrahedron. The electronic absorption spectra of HL and metal complexes have been studied. Azomethine HL and metal complexes were studied for antibacterial, protistocidal, and fungistatic activities. It was found that all compounds did not have fungistatic activity against Penicillium italicum, antibacterial activity against Staphylococcus aureus and Escherichia coli, and only for HL showed procystoid activity against Colpoda steinii at the level of the reference drug chloroquine.