Distrontium trimanganese(II) bis(hydrogenphosphate) bis(orthophosphate)

Abstract

Key indicators: single-crystal X-ray study; T = 296 K; mean (P-O) = 0.001 Å; R factor = 0.019; wR factor = 0.045; data-to-parameter ratio = 27.3.The title compound, Sr 2 Mn 3 (HPO 4 ) 2 (PO 4 ) 2 , was synthesized under hydrothermal conditions. In the structure, one of two Mn atoms is located on an inversion centre, whereas all others atoms are located in general positions. The framework structure is built up from two types of MnO 6 octahedra (one almost undistorted, one considerably distorted), one PO 3 OH and one PO 4 tetrahedron. The centrosymmetric MnO 6 octahedron is linked to two other MnO 6 octahedra by edgesharing, forming infinite zigzag chains parallel to [010]. The PO 3 OH and PO 4 tetrahedra connect these chains through common vertices or edges, resulting in the formation of sheets parallel to (100). The Sr 2+ cation is located in the interlayer space and is bonded to nine O atoms in form of a distorted polyhedron and enhances the cohesion of the layers. Additional stabilization is achieved by a strong interlayer O-HÁ Á ÁO hydrogen bond between the PO 3 OH and PO 4 units. The structure of the title phosphate is isotypic to that of Pb 2 Mn 3 (HPO 4 ) 2 (PO 4 ) 2 . Related literature ExperimentalCrystal data

Crystal structure of silver strontium copper orthophosphate, AgSr4Cu4.5(PO4)6

“…Na 4 CaFe 4 (PO 4 ) 6 which adopts the ISSN 2056-9890 Alluaudite structure in the ideal C2/c space group (Hidouri et al, 2004), Ba 3 V4(PO 4 ) 6 which crystallizes as a Langbeinitetype structure (Dross & Glaum, 2004), CuTi 4 (PO 4 ) 6 which belongs to the Nasicon family (Kasuga et al, 1999), the silver lead apatite Pb 8 Ag 2 (PO 4 ) 6 (Ternane et al, 2000), the mixedvalent iron(II/III) phosphate Fe 7 (PO 4 ) 6 (Belik et al, 2000) and Na 2.5 Y 0.5 Mg 7 (PO 4 ) 6 with a Fillowite-type structure (Jerbi et al, 2010). Through hydrothermal processes, and as part of our systematic studies of the crystal alkaline and alkaline earth monophosphates, we have previously succeeded in elaborating a number of compounds with three-dimensional networks featuring distinctive cavities including AgMg 3 (H-PO 4 ) 2 PO 4 (Assani et al, 2011), Sr 2 Mn 3 (HPO 4 ) 2 (PO 4 ) 2 (Khmiyas et al, 2013), SrMn 2 II Mn III (PO 4 ) 3 (Alhakmi et al, 2013), NaMg 3 (HPO 4 ) 2 PO 4 (Ould Saleck et al, 2015). In an extension of our investigations and structural studies of various mono-divalent transition-metal phosphates a new phosphate copper (Cu II )-based AgSr 4 Cu 4.5 (PO 4 ) 6 was prepared and successfully characterized.…”

Synthesis and crystal structure of calcium dizinc iron(III) tris(orthophosphate), CaZn2Fe(PO4)3

“…In our previous hydrothermal investigations, a variety of compounds have been synthesized and characterized with different ratios of alkaline earth metal:P, viz. Sr 2 Mn 3 (HPO 4 ) 2 (PO 4 ) 2 (Khmiyas et al, 2013), BaMn II 2 Mn III (PO 4 ) 3 (Assani et al, 2013), Mg 7 (PO 4 ) 2 (HPO 4 ) 4 (Assani et al, 2011). In this context, our interest is focused on the synthesis of new iron orthophosphates with an open-framework structure.…”