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

Abstract

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 PO4tetrahedra and two types of MnO6octahedra, 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 MnO6octahedra by an edge common, forming infinite zigzag Mn3O14chains running along thebaxis. Adjacent chains are linked by PO4and 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.