Wydział Chemii

Marta Otręba

Vasyl Kinzhybalo

Aleksandra M. Sokołowska

Rafał Lipiński

Przemysław Szklarz

Anna Piecha-Bisiorek

Katarzyna A. Ślepokura

2026

Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials

82

209-223

10.1107/s2052520626001514

Naukowa

Angielski

Artykuł

A series of 12 compounds: Na(H₃P₂O₆) (1 and 2), Na(H₃P₂O₆)·H₂O (3), Na₂(H₂P₂O₆) (4 and 5), Na₂(H₂P₂O₆)·2H₂O (6), Na₂(H₂P₂O₆)·6H₂O (7 and 8), Na₅(H₂P₂O₆)(HP₂O₆)·21H₂O (9), Na₃(HP₂O₆) (10 and 11) and Na₃(HP₂O₆)·9H₂O (12) has been characterized by variable-temperature optical microscopy, thermogravimetry, single-crystal and powder X-ray diffraction. Crystalline salts 1–4, 6–10 and 12 have been obtained in typical solution crystallization processes. Dehydrations of Na(H₃P₂O₆)·H₂O (3), Na₂(H₂P₂O₆)·­6H₂O (both 7 and 8) and Na₃(HP₂O₆)·9H₂O (12) were monitored by TGA, variable-temperature microscopy and powder or microsample powder X-ray diffraction, and turned out to be one-step, destructive transformations, resulting in almost pure triclinic form of Na(H₃P₂O₆) (1), α-Na₂(H₂P₂O₆) (4) and α-Na₃(HP₂O₆) (10), respectively. Sodium ionic conductivity was calculated using the bond valence sum method for all obtained anhydrous substances and measured for the best candidate, compound 4 in the temperature range 300–420 K, reaching 10⁻⁴ S m⁻¹.

crystal structure, sodium salts, hypodi­phospho­ric acid, polymorphism, dehydration, powder X-ray diffraction, thermal analysis, ionic conductivity

http://dx.doi.org/10.1107/s2052520626001514