A novel 2-Butyl-4-chloro-5-formylimidazole thiosemicarbazonecobalt (II) complex is synthesized and characterized by using spectroscopic techniques like elemental analysis, FT-IR, HRMS, electronic spectral analysis and Powder-X-ray diffraction. The Co(II) complex is found to be highly efficient in inhibiting the growth of human pathogens likeS. aureusand B. megaterium with MIC value 12.0 µg/mL whose inhibition zones are almost comparable with the standard antibiotic. The synthesized complex well occupies in the active site of β- ketoacyl-acyl carrier protein synthase III enzyme (PDB: 1MZS), in consists of catalytic triad and adenine-binding site, so the designed compoundis promising for to treat bacterial infection.

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