Dicobalt(II) lead(II) hydrogenphos-phate(V) phos-phate(V) hydroxide monohydrate

The title compound, Co(2)Pb(HPO(4))(PO(4))OH·H(2)O, which was synthesized under hydro-thermal conditions, crystallizes in a new structure type. Except for two O atoms in general positions and two Co atoms on centres of symmetry, all other atoms in the asymmetric unit (1 Pb, 2 Co, 2 P, 8 O and 4 H) are located on mirror planes. The structure is built up from two infinite linear chains, viz.(1) (∞)[CoO(2/1)(H(2)O)(2/2)O(2/2)] and (1) (∞)[CoO(2/1)(OH)(2/2)O(2/2)], of edge-sharing CoO(6) octa-hedra running along [010]. Adjacent chains are linked to each other through PO(4) and PO(3)(OH) tetra-hedra, leading to the formation of layers parallel to (100). The three-dimensional framework is formed by stacking along [100] of adjacent layers that are held together by distorted PbO(8) polyhedra. Hydrogen bonds of the type O-H⋯O involving the water mol-ecule are very strong, while those O atoms involving the OH groups form weak bifurcated and trifurcated hydrogen bonds.