Crystal structure and characterization of a new copper( II)-ciprofloxacin (cf) complex [Cu(cf)(H2O)(3)]SO4 center dot 2H(2)O

A new copper complex of quinolone ciprofloxacin (cf) with the formula [Cu(c f)(H2O)(3)]SO4. 2H(2)O was isolated and its crystal structure was determine d by X-ray crystallography. There is a slightly distorted square pyramidal coordination around central copper ion in the structure. Quinolone molecule is bonded to the metal through carbonyl O(3) atom (Cu-O(3) =1.939(1) X) an d carboxylic O(1) atom (Cu-O(1) =1.915(2) X). Two water molecules are coord inated to copper in the basal plane with distances Cu-O( 8) = 1.972 (2) X a nd Cu-O( 9) =1.989( 2) X. The apical water molecule is coordinated at a lon ger distance (Cu-O(10) =2.174( 2) X). This structural pattern is considerab ly different from the bonding in copper-quinolone complexes reported in the literature so far.