Acta Cryst. (2012). E68, m38-m39  [ doi:10.1107/S1600536811052512 ]

Poly[[{₃-dihydrogen [(pyridin-4-ylmethylimino)bis(methylene)]diphosphonato-⁵O:O',N,O'':N'}copper(II)] dihydrate]

S.-Y. Zhang, Z.-G. Zhou and K.-J. Wang

Abstract: In the title polymer, {[Cu(C₈H₁₂N₂O₆P₂)]·2H₂O}_n, the geometry of the five-coordinate Cu^II ion can best be described as slightly distorted square-pyramidal formed by one N and two O atoms of an N(CH₂PO₃H)₂ group and one N atom from a pyridine ring. The elongated apex of the pyramid is occupied by one O atom from a third diphosphonate ligand. The interconnection of Cu²⁺ ions by the diphosphonate ligands results in the formation of a double-chain array along the b axis, in which the two sub-chains are interlocked by pairs of PO₃ groups. The outside of each sub-chain is decorated by other PO₃ groups. These double chains are further assembled into a three-dimensional supramolecular architecture via a large number of O-HO hydrogen bonds between the phosphonate groups and lattice water molecules.

Online 10 December 2011

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