The title compound, barium trimanganese tris(orthophosphate), was synthesized hydrothermally. Its structure is isotypic with the lead and strontium analogues AMnII 2MnIII(PO4)3 (A = Pb, Sr). Except for two O atoms on general positions, all atoms are located on special positions. The Ba and one P atom exhibit mm2 symmetry, the MnII atom 2/m symmetry, the MnIII atom and the other P atom .2. symmetry and two O atoms are located on mirror planes. The crystal structure contains two types of chains running parallel to [010]. One chain is linear and is composed of alternating MnIIIO6 octahedra and PO4 tetrahedra sharing vertices; the other chain has a zigzag arrangement and is built up from two edge-sharing MnIIO6 octahedra connected to PO4 tetrahedra by edges and vertices. The two types of chains are linked through PO4 tetrahedra into an open three-dimensional framework which contains channels parallel to [100] and [010] in which the BaII ions are located. The alkaline earth cation is surrounded by eight O atoms in the form of a slightly distorted bicapped trigonal prism.
The title compound, lead trimanganese tris(orthophosphate), has been synthesized by hydrothermal methods. In this structure, only two O atoms are in general positions and all others atoms are in the special positions of the Imma space group. Indeed, the atoms in the Wyckoff positions are namely: Pb1 and P1 on 4e (mm2); Mn1 on 4b (2/m); Mn2 and P2 on 8g (2); O1 on 8h (m); O2 on 8i (m). The crystal structure can be viewed as a three-dimensional network of corner- and edge-sharing PO4 tetrahedra and MnO6 octahedra, building two types of chains running along the b axis. The first is an infinite linear chain, formed by alternating MnIIIO6 octahedra and PO4 tetrahedra which share one vertex. The second chain is built up from two adjacent edge-sharing octahedra (MnII 2O10 dimers) whose ends are linked to two PO4 tetrahedra by a common edge. These chains are linked together by common vertices of polyhedra in such a way as to form porous layers parallel to (001). These sheets are bonded by the first linear chains, leading to the appearance of two types of tunnels, one propagating along the a axis and the other along b. The PbII ions are located within the intersections of the tunnels with eight neighbouring O atoms in form of a trigonal prism that is capped by two O atoms on one side. The three-dimensional framework of this structure is compared with similar phosphates such as Ag2Co3(HPO4)(PO4)2 and Ag2Ni3(HPO4)(PO4)2.
Mn III (PO 4 ) 3 . -The title compound is prepared hydrothermally from Sr, Mn, and precursors in a molar ratio of 1:3:3 (autoclave, 458 K, 5 d). The structure of SrMn3(PO4)3 (orthorhombic, space group Imma, Z = 4; single crystal XRD) is isotypic to PbMn3(PO4)3 with two O atoms in general positions and all other atoms in special positions. The three-dimensional network contains two types of chains, one of them linear and composed of alternating Mn III O 6 octahedra and PO 4 tetrahedra sharing vertices, and the other with a zigzag arrangement built up from two edge-sharing Mn II O6 octahedra connected to PO4 tetrahedra by edges and vertices. -(ALHAKMI*, G.; ASSANI, A.; SAADI, M.; FOLLET, C.; EL AMMARI, L.; Acta Crystallogr., Sect. E: Struct. Rep. Online 69 (2013) 9, i56, http://dx.doi.org/10.1107/S1600536813020977 ; Lab. Chim. Solide Appl., Fac. Sci., Univ. Mohammed V, Rabat, Morocco; Eng.) -J. Schramke 45-004 SrMn II 2 PO 3-4
In contrast to most other structures of transition metal orthophosphates with composition M 3- xM’x(PO4)2·H2O, the three metallic sites in the structure of Mn2Zn(PO4)2·H2O show no statistical disorder.
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