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inorganic compounds
Single crystals of monoclinic α-VOHPO4.2H2O, α-oxovanadium(IV) hydrogen phosphate dihydrate, were synthesized by hydrothermal reaction. The structure was refined with good accuracy (R = 0.018) and the results are compared with those of an earlier structure determination from X-ray powder data [Le Bail, Amoros & Beltran-Porter (1989). Eur. J. Solid State Inorg. Chem. 26, 419–426]. Significant differences in bond lengths were found. The structure consists of vanadyl hydrogenphosphate layers running along [100]. The layers are connected via hydrogen bonds.