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The structure of poly[caesium(I) [([mu]4-ethyl­enediphosphon­ato)­cobalt(II)]], {Cs[Co(C2H5O6P2)]}n, reveals a three-dimensional polymeric open framework consisting of tetra­hedral CoII atoms coordinated by four different ethyl­ene­diphosphonate O atoms and inter­molecular O-H...O hydrogen bonds. The largest open window is made of corner-sharing CoO4 and PO3C tetra­hedra, giving 16-membered rings of dimensions 9.677 (5) × 4.684 (4) Å2. There are two independent ethylenediphosphonate ligands, each lying about an inversion centre.
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