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

Abstract

The title compound, Pb 2 Mn 3 (HPO 4 ) 2 (PO 4 ) 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 PO 4 tetrahedra and two types of MnO 6 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 MnO 6 octahedra by an edge common, forming infinite zigzag Mn 3 O 14 chains running along the b axis. Adjacent chains are linked by PO 4 and PO 3 (OH) tetrahedra through vertices or by edge sharing, forming sheets perpendicular to [100]. The Pb 2+ 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.