CRYSTAL STRUCTURE AND CHARACTERIZATION OF A NEW COPPER(II)-CIPROFLOXACIN (cf) COMPLEX [Cu(cf)(H₂O)₃]SO₄.2H₂O

Iztok Turel^a, Ljubo Goliè^a, Oscar Leonel Ruiz Ramirez^b

^a University of Ljubljana, Faculty of Chemistry and Chemical Technology, Aškerèeva 5, 1000 Ljubljana, Slovenia ^bUniversidad Nacional Autonoma de Mexico, Instituto de Quimica, Mexico

Abstract

A new copper complex of quinolone ciprofloxacin (cf) with the formula [Cu(cf)(H₂O)₃]SO₄.2H₂O was isolated and its crystal structure was determined 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) C) and carboxylic O(1) atom (Cu-O(1) =1.915(2) C). Two water molecules are coordinated to copper in the basal plane with distances Cu-O(8) =1.972 (2) C and Cu-O(9) =1.989(2) C. The apical water molecule is coordinated at a longer distance (Cu-O(10) =2.174(2)C). This structural pattern is considerably different from the bonding in copper-quinolone complexes reported in the literature so far.