The missing representatives of the hydrated sodium orthophosphate phases: Na<sub>3</sub>(PO<sub>4</sub>)(H<sub>2</sub>O)<sub>7</sub> and Na<sub>3</sub>(PO<sub>4</sub>)(H<sub>2</sub>O)<sub>6</sub>.
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ABSTRACT: The crystal structures of the long-known compound Na3(PO4)(H2O)6, tris-odium orthophosphate hexa-hydrate, and the compound Na3(PO4)(H2O)7, tris-odium orthophosphate hepta-hydrate, the possible existence of which is discussed in the literature, were elucidated by single-crystal X-ray diffraction. In both crystal structures, all the water mol-ecules are bound to the sodium cations, but the different water content leads to different arrangements in terms of polyhedral linkage. In the case of the hepta-hydrate (space group Pca21, Z = 4), this results in a layered structure made up from three sixfold coordinated Na+ cations with phosphate units in between. In the case of t
SUBMITTER: Weil M
PROVIDER: S-EPMC12810264 | biostudies-literature | 2025 Dec
REPOSITORIES: biostudies-literature
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