Crystal structure of di-mu-hvdroxido-bis{aqua[ethyl(1,10-phenanthrolin-3-yl)pnospnonato-ka ppa N-2,N `]-copper(II)} heptahydrate

In the title compound, [Cu-2(OH)(2){C12H7N2(PO3C2H5)}(2)(H2O)(2)]center dot 7H(2)O, two Cu2+ cations are bridged by two hydroxide groups, forming a centrosymmetric binuclear complex. Each Cu2+ cation is further coordinated by the N atoms of a bidentate ethyl (1,10-phenanthrolin-3-yl)phosphonate anion and a water molecule in a square-pyramidal geometry. In the crystal, a network of O-H center dot center dot center dot O hydrogen bonds involving the P(O)(O-)(OEt) groups, bridging hydroxyl groups, coordinated and uncoordinated water molecules generates a three-dimensional supramolecular structure. The ethyl group exhibits disorder and was modelled over three sites with occupancies of 0.455, 0.384 and 0.161.