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The manganese pyroarsenate hydrate, Mn 2 As 2 O 7  · 2 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 P2 1 /n with a = 6.6576(4), b = 14.555(1), c = 7.8147(5) Å, β = 94.935(1)°, V = 754.46(8) Å 3  and Z = 4. The manganese ions are each coordinated to five oxygen atoms and a water molecule in a distorted octahedral arrangement. Edge-sharing MnO 6  octahedra form chains which are connected to a three-dimensional framework by As 2 O 7  4-  ions. The pyroarsenate anion, which attains a nearly eclipsed conformation, has a mean As-O distance for the terminal As-O bonds of 1.669(2) Å, while for the bridging oxygen atom a mean value of 1.757(2) Å is observed. Magnetic susceptibility measurements indicate the presence of high-spin Mn 2+  ions. Thermogravimetric as well as IR and Raman spectroscopic studies of Mn 2 As 2 O 7  · 2 H 2 O are presented.

Synthesis and Characterization of the Manganese Pyroarsenate Mn 2 As 2 O 7 · 2H 2 O