ChemInform Abstract: Contributions on Crystal Structures and Thermal Behavior of Anhydrous Phosphates. Part 29. Preparation and Structure Determination of SrMn2(PO4)2 and Redetermination of β′-Mn3(PO4)2.
Abstract
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ChemInform Abstract
Single crystals of SrMn2(PO4)2 are obtained from a mixture of SrCl2×6H2O, Mn(OAc)2, and NH4H2PO4 (1. 873 K, 6 h; 2. 1173 K, 24 h; 3. 1373 K). The compound crystallizes in the triclinic space group P
with Z = 4 and represents a new structure type characterized by a hexagonal close packing of phosphate groups. In addition, single crystals of β′-Mn3(PO4)2 are grown by chemical vapor transport using a phosphorus/iodine mixture as transport agent (850→800 °C). The reinvestigation of its structure (monoclinic, space group P21/c, Z = 12) yields improved R-values and significantly reduced standard deviations for the interatomic distances.
