Synthesis, crystal structures and antibacterial activities of trifluoromethylsulfonate salts of 2-[(3-chloropyridinium-2-yl)hydrazonomethyl]-6-methoxyphenol and its copper(II) and cobalt(III) complexes

A new trifluoromethylsulfonate salt of 2-[(3-chloropyridinium-2-yl)hydrazonomethyl]-6-methoxyphenol, (HL)CF 3 SO 3 , and its copper(II) and cobalt(III) complexes, [CuL(OH 2 )]CF 3 SO 3 ·0.5H 2 O ( 1 ) and [CoL 2 ]CF 3 SO 3 ·CH 3 OH ( 2 ), were prepared and characterized by physico-chemical methods and single crystal X-ray analysis. A trifluoromethylsulfonate anion is present in each of the compounds. The Cu atom in complex 1 is coordinated by the phenolate O, imino N and pyridine N atoms of L ligand, giving square planar geometry. The Co atom in complex 2 is coordinated by two phenolate O, two imino N and two pyridine N atoms from two L ligands, giving octahedral geometry. The three compounds were tested in vitro for their antibacterial activities.