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The new manganese phosphate hydrate,Mn 6 (PO 4 ) 4· H 2 O, has been obtained as a single phase product using hydrothermal methods and the structure has been determined by single crystal X-ray diffraction. The title compound crystallizes in the monoclinic space group Cc with a = 934.18(10), b = 1743.68(18), c = 815.15(8) pm, β = 92.616(2)°, V = 1326.4(2)·10 6  pm 3 , Z = 4, and the refinement led to R1 = 0.0281 and Rw2 = 0.0728 (all data). The structure is composed of [PO 4 ] and [MnO x ] polyhedra (x = 6, 7) and might be described as a distorted primitive hexagonal packing of [PO 4 ] tetrahedra which are held together by Mn 2+  ions partially located in distorted trigonal prismatic positions. This leads to a dense three-dimensional framework structure. Magnetic susceptibility measurements verified the presence of high-spin Mn 2+  ions and thermogravimetric data confirm the chemical composition deduced from the single crystal structure determination.

Synthesis and Characterization of Mn 6 (PO 4 ) 4 ·H 2 O, a New Metal(II) Phosphate Hydrate