title: Copper(II) hydrogenphosphate, CuHPO(4).
abstract: The title compound, CuHPO(4), has been synthesized from a mixture of phospho-ric acid and copper oxide. It has the same composition as MHPO(4) (M = Ca, Ba, Pb, Sr or Sn), but adopts a rhombohedral structure with all atoms on general positions. The structure features distorted PO(4) tetra-hedra linked by copper, forming 12-membered rings. The Cu(II) atom is coordinated by five O atoms in a distorted square-pyramidal manner. O-H⋯O hydrogen bonding leads to an additional stabilization of the structure.
authors.forename: Christiane
authors.initials: C
authors.lastname: Günther
authors.forename: Helmar
authors.initials: H
authors.lastname: Görls
authors.forename: Dörte
authors.initials: D
authors.lastname: Stachel