title: Studies on antimicrobial activity of cobalt(III) ethylenediamine complexes.
abstract: A series of cobalt(III) mixed ligand complexes of type [Co(en)2L]+3, where L is bipyridine, 1,10-phenanthroline, imidazole, methylimidazole, ethyleimidazole, dimethylimidazole, urea, thiourea, acetamide, thioacetamide, semicarbazide, thiosemicarbazide, or pyrazole, have been isolated and characterized. The structural elucidation of these complexes has been explored by using absorption, infrared, and 1H NMR nuclear magnetic resonance spectral methods. The infrared spectral data of all these complexes exhibit a band at 1450/cm and 1560-1590/cm, which correspond to C=C and C=N, a band at 575/cm for Co-N (en), and a band at 480/cm for Co-L (ligand). All these complexes were found to be potent antimicrobial agents. The antibacterial activity was studied in detail in terms of zone inhibition, minimum bactericidal, and time period of lethal action. Among all, complexes bipyridine, 1,10-phenanthroline, dimethylimidazole, and pyrazole, possess the highest antibacterial activity. Antifungal activity was done by disc-diffusion assay and 50% inhibitory concentrations that possess high antifungal activity.
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad, India.
authors.forename: Penumaka
authors.initials: P
authors.lastname: Nagababu
authors.forename: J Naveena Lavanya
authors.initials: JN
authors.lastname: Latha
authors.forename: P
authors.initials: P
authors.lastname: Pallavi
authors.forename: S
authors.initials: S
authors.lastname: Harish
authors.forename: S
authors.initials: S
authors.lastname: Satyanarayana
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D000890:Anti-Infective Agents / Q000737:chemistry / Q000494:pharmacology*; D000935:Antifungal Agents / Q000737:chemistry / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects / Q000254:growth & development; D003035:Cobalt / Q000737:chemistry / Q000494:pharmacology*; D005029:Ethylenediamines / Q000737:chemistry / Q000494:pharmacology*; D005658:Fungi / Q000187:drug effects / Q000254:growth & development; D020128:Inhibitory Concentration 50; D008826:Microbial Sensitivity Tests; D009942:Organometallic Compounds / Q000737:chemistry / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D000935:Antifungal Agents; D005029:Ethylenediamines; D009942:Organometallic Compounds; D003035:Cobalt; C031234:ethylenediamine