Abstract
The title compound, [Cu(1,3-HO3PC6H4PO3H)(C12H8N2)]n, is a coordination polymer of the metal–diphosphonate family. The chain structure is constructed from ‘4+1’ square-pyramidally coordinated copper(II) atoms bonded to chelating phenanthroline (phen) ligands and linked through 1,3-phenyldihydrogendiphosphonate ligands. The basal plane of the Cu(II) site is defined by the phen nitrogen donors and phosphonate oxygen atoms from two diphosphonate ligands, while the apical position is occupied by an oxygen donor from a third diphosphonate ligand. The chains propagate along the a-axis direction. Inversion-related phen groups engage in π-π stacking with a mean distance of 3.376 (2) Å between the ring planes. O—H⋯O hydrogen-bonding interactions between the protonated {P—OH} groups of one chain and the {P=O} groups of adjacent chains stabilize the crystal packing.
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