Crystal structure of two hydrate phases of ciprofloxacindi-um tetrachloridocobaltate(II)

New (C17H20FN3O3)(2)[CoCl4](2)center dot 3H(2)O (I) and C17H20FN3O3[CoCl4]center dot H2O (II) compounds, where C17H18FN3O3 is ciprofloxacin (CfH), are synthesized and their crystal structures are determined. Crystallographic data for I: a = 18.441(5) , b = 9.030(3) , c = 27.551(8) , V = 4588(4) (3), space group Pca2(1), Z = 4; for II: a = 9.305(3) , b = 9.885(3) , c = 12.999(4) , alpha = 82.782(4)A degrees, beta = 72.954(4)A degrees, gamma = 89.736(4)A degrees, V = 1133(1) (3), P-1 space group, Z = 2. Both structures contain CfH (3) (2+) ion pairs bonded by the pi-pi interaction. Additionally, in the crystal of I there is a stacking interaction between the pi clouds of aromatic rings and hydrogen atoms of the cyclopropyl group linking the pairs of molecules with each other. The structure of the centrosymmetric crystal of triclinic phase II is also formed from CfH (3) (2+) ion pairs bonded by the pi-pi interaction, which, in this case, are not independent because they are related by the symmetry center. Hydrogen bonds form a branched three-dimensional network linking the CfH (3) (2+) and CoCl (4) (2-) ions and water molecules.