Crystal structures of two modifications of sodium pentahydrogendiphosphate NaH5(PO4)2 |
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| Authors: | E. V. Kosterina V. B. Rybakov E. Kemnitz S. I. Troyanov |
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| Affiliation: | 1. Chemistry Department, Moscow State University, Vorob’evy gory, Moscow, 119899, Russia
2. Institut für Chemie, Humboldt Universit?t, Berlin, Germany
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| Abstract: | Two crystalline modifications of NaH5(PO4)2 are obtained by the reaction of Na2CO3 with an excess of orthophosphoric acid. The crystal structures of α-and β-NaH5(PO4)2 are determined by X-ray diffraction analysis. The crystal data are a = 8.484(4) Å, b = 7.842(3) Å, c = 10.353(4) Å, β = 90.50(3)°, V = 689.3(3) Å3, space group P21/c, Z = 4, and R 1 = 0.0250 for the α modification and a = 7.127(2) Å, b = 13.346(4) Å, c = 7.177(2) Å, β = 95.5(2)°, V = 679.5(3) Å3, space group P21/c, Z = 4, and R 1 = 0.0232 for the β modification. Based of the hydrogen-bond system, the formulas of the α and β modifications can be represented as Na(H2PO4)(H3PO4) and Na[H(H2PO4)2], respectively. They correspond to the stable and metastable forms of the compound. |
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