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Oxyanion clusters with antielectrostatic hydrogen bonding in tetraalkylammonium hypodiphosphates

Abstract

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.

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Publication details

The article was received on 27 May 2018, accepted on 19 Jul 2018 and first published on 19 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00880A
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Oxyanion clusters with antielectrostatic hydrogen bonding in tetraalkylammonium hypodiphosphates

    M. Emami, K. Ślepokura, M. Trzebiatowska, N. Noshiranzadeh and V. Kinzhybalo, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00880A

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