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Structural variety and dehydration in 3-aminopyridine–hypodiphosphoric acid–water system
Autorzy
Rok wydania
2023
Czasopismo
Numer woluminu
25
Strony
3826-3836
DOI
10.1039/d3ce00186e
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Organic–inorganic salts and ionic co-crystals of hypodiphosphoric acid (H4P2O6, PP) with 3-aminopyridine (3ap) have been synthesized and characterized by X-ray diffraction (single-crystal and micro-powder), thermogravimetry and Fourier-transform infrared spectroscopy. (3apH)2(H2P2O6)·0.5H4P2O6·H2O (1), (3apH)6(H2P2O6)(P2O6)·2H2O (3) and (3apH2)(H2P2O6) (5) were obtained in crystalline form in typical solution-crystallization processes, using the molar ratio of PP acid (water solution) : 3ap (solid) 1 : 1, 1 : 3 or 2 : 1, respectively. Compounds (3apH)4(H3P2O6)2(H2P2O6) (2) and (3apH)2(H2P2O6)·3ap (4) were formed during dehydration processes of (1) and (3), respectively, which took place as destructive transformations. Compound (2) was also obtained by crystallization from a molten salt. The removal of water results in rearrangement of the crystal architecture (both the hypodiphosphate substructure and the organic part), and formation of polar structure in (4).
Adres publiczny
http://dx.doi.org/10.1039/d3ce00186e
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