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A physico-chemical study of the interaction of cobalt(II) ion with ciprofloxacin

Reaction between the quinolone antibacterial agent ciprofloxacin (abbreviation cfH) and Co I I in aqueous medium was studied. The ability of ciprofloxacin to form metal complexes is highly dependent on the pH value of thesolution. UV spectroscopy and solubility of ciprofloxacin.HCl were used to determine the optimal conditions for complex isolation in the pH region between 5 and 10, where the solubility of quinolones is very low. The isolated complex [Co(cf) 2 ]. 3H 2 O was characterized by elemental analysis, FAB-MS, TG analysis, IR spectroscopy and magnetic measurements. Cobalt K-edge EXAFS was used for the identification of the Co site in the complex.