[CuCl(C12H9N2O5)(C12H10N2O5)(H2O)]

In the title compound, aquachloro(1-ethyl-1,4-dihydro-4-oxo-1,3-dioxolo [4, 5-g]cinnoline-3-carboxylato-O-3,O-4)-(1-ethyl-1,4-dihydro-4-oxo-1,3-dioxolo [4,5-g]cinnoline-3- carboxylic acid-O-3, O-4)copper(II), the Cu-II ion adop ts a tetragonally distorted octahedral geometry. In the equatorial plane, t he Cu-II ion is coordinated to two O atoms (O-keto and O-carboxylate) of on e cinoxacinate ligand, and to two O atoms (O-keto and O-carboxylic) of one cinoxacin molecule. The apical positions are occupied by one O atom from th e water molecule and one Cl- ion, resulting in a CuClO5 chromophore.