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In the title coordination polymer, [Cu 3 (C 5 H 7 N 2 O 7 P 2 ) 2 (H 2 O) 2 ]  n  , one Cu II  atom is five-coordinated by five O atoms from three 1-hy­droxy-2-(imidazol-3-ium-1-yl)ethane-1,1-diyldiphospho­nate ( L ) ligands in a distorted square-pyramidal geometry. The other Cu II  atom, lying on an inversion center, is six-coordinated in a distorted octa­hedral geometry by four O atoms from two  L  ligands and two O atoms from two water mol­ecules. The five-coordinated Cu II  atoms are linked by phospho­nate O atoms of the  L  ligands, forming a polymeric chain. These chains are further linked by the six-coordinated Cu atoms into a layer parallel to (    01). N—H⋯O and O—H⋯O hydrogen bonds connect the layers into a three-dimensional supra­molecular structure.

Poly[diaquabis[μ-1-hydroxy-2-(imidazol-3-ium-1-yl)ethane-1,1-diyldiphosphonato]tricopper(II)]