Gamma-ray irradiation, characterization, DFT study, electrical conductivity and antimicrobial evaluation of synthesized tetradentate ligand and its complexes with some transition metal ions

Abstract The present study describes the synthesis of mononuclear Co(II) ( 1 ), Ni(II) ( 2 ) and binuclear Cu(II) ( 3 ) chelates of the ligand ( L ): N,N′-(propane-1,3-diyl)bis(2-aminobenzamide). Their structural characterization was affirmed by different analytical, spectroscopic, thermal techniques, powder X-ray diffraction and DFT. Octahedral structure was assured for Co(II) ( 1 ), Ni(II) ( 2 ) and distorted square planar for Cu(II) ( 3 ) chelates. Also, the current work was to establish the impact of a high dose of γ -ray irradiation on their physical and chemical properties. In addition, the dc solid-state electrical conductivity of un-irradiated and γ -irradiated chelates have been performed. Changes in crystallite size and solid electrical conductivity were observed as a result of defect formation upon irradiation. The in vitro antimicrobial property of the chelates towards Staphylococcus aureus as Gram +ve bacteria, Escherichia coli as Gram −ve bacteria, and Candida albicans and Aspergillus niger as fungal strains was evaluated for unirradiated complexes. The outcomes of antimicrobial studies showed that the ligand and its complexes possess excellent to good activity towards the examined microorganisms.