2013. 54, 3 – UDC 548.73:541.49:546.73 STRUCTURE OF A NEW SCHIFF BASE COBALT(III) COMPLEX WITH ANTIBACTERIAL ACTIVITY C.-H. Dai, F.-L. Mao Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection, Department of Chemistry, Yancheng Normal College, Yancheng, P. R. China E-mail: xpzhougroup@163.com Received January, 1, 2012 Revised — March, 16, 2012 A new Schiff base cobalt(III) complex with the formula [CoL1L2(N3)]NO3 (L1 is 2-[1-(2phenylaminoethylimino)ethyl]phenolate, L2 is N-phenylethane-1,2-diamine) is prepared and characterized by physicochemical methods and single crystal X-ray determination. <...> Single crystal X-ray diffraction analysis reveals that the complex contains two mononuclear [CoL1L2(N3)]+ cations and two nitrate anions. <...> The Co atom is six-coordinated in an octahedral geometry. <...> The ligands and the cobalt(III) complex are screened in vitro for their antibacterial activity against Bacillus subtillis, Staphylococcus aureus, Escherichia coli, and Pseudomonas aereuguinosa. <...> This work deals with the synthesis and characterization of a new cobalt(III) complex of [CoL1L2(N3)]NO3, where L1 is 2-[1-(2-phenylaminoethylimino)ethyl]phenolate and L2 is N-phenylethane-1,2-diamine. <...> The coordination behavior of the ligands toward the cobalt(III) ion was investigated by IR, molar conductivity, and single crystal X-ray determination. <...> The antibacterial activity of the ligands and the cobalt(III) complex was studied against the bacterial species Bacillus subtillis, Staphylococcus aureus, Escherichia coli, and Pseudomonas aereuguinosa. <...> EXPERIMENTAL Materials and methods. 2-Acetylphenol and N-phenylethane-1,2-diamine with analytical grade were available from Alfa Aesar Company. obalt nitrate and other chemicals with analytical grade were purchased from Beijing Chemical Reagent Company and were used without further purification. <...> IR spectra (4000—400 cm–1), as KBr pellets, were recorded on a Nicolet FT-IR 170X spectrophotometer. <...> A mixture of 2-acetylphenol (1.36 g, 10 mmol) and N-phenylethane-1,2diamine (1.36 g, 10 mmol) in methanol (50 ml) was refluxed for 30 min. Then the solvent was evaporated to give yellow gummy product of HL1 with quantitative yield. <...> To the mixture a methanolic solution (10 ml) of cobalt nitrate (0.291 g <...>