Poly[(acetone)tetraaqua[mu(6)-ethyl (dichloromethylene)diphosphonato][mu(5)-ethyl (dichloromethylene)diphosphonato]tribarium(II)].

The novel title compound, [Ba(3)(C(3)H(5)Cl(2)O(6)P(2))(2)(C(3)H(6)O)(H(2)O)(4)](n), has a polymeric two-dimensional network structure which lies parallel to the (10-1) plane. The asymmetric unit consists of three independent Ba(2+) ions, two of them eight-coordinated and the third nine-coordinated, and two independent ethyl (dichloromethylene)diphosphonate(3-) ligands, one acetone ligand and four aqua ligands. The coordination environments around the BaO(8) polyhedra are best described as bicapped trigonal prismatic, while the BaO(9) polyhedron is in a distorted tricapped trigonal prismatic geometry. The two diphosphonate ligands adopt different coordination modes. Both ligands chelate three metal cations, but one is coordinated to six metal cations in total and forms two six-membered and one four-membered chelate ring, while the other is coordinated to five metal cations in total and forms one six-membered and two four-membered chelate rings, the fifth unsubstituted O atom remaining uncoordinated.

Poly[[µ-aqua-aqua-[µ(4)-ethyl (dichloro-methyl-ene)diphospho-nato]sesqui-calcium(II)] acetone hemisolvate 4.5-hydrate].

The title compound, {[Ca(1.5)(C(3)H(5)Cl(2)O(6)P(2))(H(2)O)(2)]·0.5CH(3)COCH(3)·4.5H(2)O}(n), has a two-dimensional polymeric structure. The asymmetric unit contains two crystallographically independent Ca(2+) cations connected by a chelating and bridging ethyl (dichloro-methyl-ene)diphos-pho-n-ate(3(-)) ligand and an aqua ligand. One of the Ca atoms, lying on a centre of symmetry, has a slightly distorted octa-hedral geometry, while the other Ca atom is seven-coordinated in a distorted monocapped trigonal-prismatic geometry. The polymeric layers are further connected by extensive O-H⋯O hydrogen bonding into a three-dimensional supra-molecular network. The acetone solvent mol-ecule and one uncoordin-ated water mol-ecule are located on twofold rotation axes.

catena-Poly[[diaqua-cadmium(II)]-µ-(methyl morpholino dichloro-methylene-diphospho-nato)-κO,O':O''-[tetra-aqua-cadmium(II)]-µ-(methyl morpholino dichloro-methyl-enediphospho-nato)-κO:O',O''].

The asymmetric unit of the title compound, [Cd(C(6)H(11)Cl(2)NO(6)P(2))(H(2)O)(3)](n), contains two octahedrally coordinated Cd atoms located in special positions, one on a twofold rotation axis and the other on a centre of symmetry. The metal atoms are connected by methyl morpholino dichloro-methyl-enediphospho-nate ligands into chains in the c-axis direction. These chains are further connected by O-H⋯O hydrogen bonds into a layer-like construction along (100).