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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.

Poly[[μ-aqua-aqua[μ4-ethyl (dichloromethylene)diphosphonato]sesquicalcium(II)] acetone hemisolvate 4.5-hydrate]

Poly[[μ-aqua-aqua[μ₄-ethyl (dichloromethylene)diphosphonato]sesquicalcium(II)] acetone hemisolvate 4.5-hydrate]