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Oxyanion clusters with antielectrostatic hydrogen bonding (AEHB) in tetraalkylammonium hypodiphosphates.
Autorzy
Rok wydania
2018
Czasopismo
Numer woluminu
20
Strony
5209-5219
DOI
10.1039/c8ce00880a
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Organic-inorganic salts of hypodiphosphoric acid with tetraalkylammonium cations have been sythesized and characterized by X-ray crystallography and IR spectroscopy. [(Et4N)(H3P2O6)]∙0.5H4P2O6∙2H2O (1), [(Et4N)2(H2P2O6)]∙H4P2O6 (2), [(n Bu4N)(H3P2O6)]∙0.75H4P2O6 (3), [(n Bu4N)(H3P2O6)]∙0.25H4P2O6∙0.52H2O (4), [(n-Bu4N)(H3P2O6)]∙0.25H4P2O6 (5) and [(Et4N)Cl]∙0.5H4P2O6∙3H2O (6) were obtained in crystalline form. Their crystal structures reveal the formation of hydrogen-bonded networks (chains and layers) built of hypodiphosphate anions and acid molecules, assisted by water molecules in the hydrates. The networks are embedded in the tetraalkylammonium cations’ framework. Free acid molecules are present in all of the studied substances. Compound 5 was formed during a solid state dehydration reaction of 4, which has taken place as single-crystal-to-single-crystal transformation. Water removal is associated with symmetry increase and the structure reconstruction, with the change in the conformation of one of hypodiphosphate anions, from usual staggered into rarely occuring eclipsed conformation. In 1, 3, 4 and 5 the formation of clusters with antielectrostatic hydrogen bonding (AEHB) was observed.
Adres publiczny
http://dx.doi.org/10.1039/c8ce00880a