Dicobalt(II) lead(II) hydrogenphos­phate(V) phos­phate(V) hydroxide monohydrate

The title compound, Co₂Pb(HPO₄)(PO₄)OH·H₂O, which was synthesized under hydro­thermal 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(H₂O)_2/2O_2/2] and ¹_∞[CoO_2/1(OH)_2/2O_2/2], of edge-sharing CoO₆ octa­hedra running along [010]. Adjacent chains are linked to each other through PO₄ and PO₃(OH) tetra­hedra, 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 PbO₈ polyhedra. Hydrogen bonds of the type O—H...O involving the water mol­ecule are very strong, while those O atoms involving the OH groups form weak bifurcated and trifurcated hydrogen bonds.

Dilead(II) trimanganese(II) bis(hydrogenphosphate) bis(phosphate)

The title compound, Pb₂Mn₃(HPO₄)₂(PO₄)₂, was synthesized by a hydro­thermal method. All atoms are in general positions except for one Mn atom which is located on an inversion center. The framework of the structure is built up from PO₄ tetra­hedra and two types of MnO₆ octa­hedra, one almost ideal and the other very distorted with one very long Mn—O bond [2.610 (4) Å compared an average of 2.161 Å for the other bonds]. The centrosymetric octa­hedron is linked to two distorted MnO₆ octa­hedra by an edge common, forming infinite zigzag Mn₃O₁₄ chains running along the b axis. Adjacent chains are linked by PO₄ and PO₃(OH) tetra­hedra through vertices or by edge sharing, forming sheets perpendicular to [100]. The Pb²⁺ cations are sandwiched between the layers and ensure the cohesion of the crystal structure. O—H...O hydrogen bonding between the layers is also observed.