Two binuclear complexes containing the enrofloxacinate anion: Cd2(C19H21N3O3F)4(H2O)2 · 4H2O and Pb2(C19H21N3O3F)4 · 4H2O

The syntheses and crystal structures of the closely related but non-isostructural Cd2(C19H21N3O3F)4(H2O)2 center dot 4H2O (1) and Pb2(C19H21N3O3F)4 center dot 4H2O (2) are described, where C19H21N3O3F- is enrofloxacinate (enro). Both compounds contain centrosymmetric, binuclear, neutral complexes incorporating a central diamond-shaped M2O2 (M = Cd, Pb) structural unit. The Cd2+ coordination polyhedron in 1 is a CdO6 trigonal prism, including one coordinated water. The Pb2+ coordination polyhedron in 2 can be described as a very distorted square-based PbO5 pyramid, although two additional short Pb center dot center dot center dot O (3.1 angstrom) contacts are also present. In the crystal of the cadmium complex, O-H center dot center dot center dot O hydrogen bonds lead to a layered structure. In the lead compound, O-H center dot center dot center dot O and O-H center dot center dot center dot N interactions lead to chains in the crystal. Crystal data: 1: C76H96Cd2F4N12O18, Mr = 1766.45, triclinic, P1, a = 12.185(2) angstrom, b = 12.306(3) angstrom, c = 14.826(3) angstrom, = 68.15(3)degrees, = 70.28(3)degrees, = 86.11(3)degrees, V = 1938.2(7) angstrom 3, Z = 1, T = 298 K, R(F) = 0.030, wR(F2) = 0.079. 2: C76H88F4N12O16Pb2, Mr = 1920.00, triclinic, P1, a = 12.0283(4) angstrom, b = 12.7465(4) angstrom, c = 13.0585(4) angstrom, = 83.751(1)degrees, = 74.635(1)degrees, = 81.502(1)degrees, V = 1904.3(1) angstrom 3, Z = 1, T = 298 K, R(F) = 0.021, wR(F2) = 0.049.