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Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
Published on: October 19, 2017
A second triclinic polymorph of (1-ammonio-1-phosphono-eth-yl)phospho-nate
Natalia V Tsaryk1, Anatolij V Dudko, Alexandra N Kozachkova
1Institute of General and Inorganic Chemistry, National Academy of Science Ukraine, Prospekt Palladina 32/34, Kyiv 03680, Ukraine.
Abstract:
The asymmetric unit of the second polymorph of the title compound, C(2)H(9)NO(6)P(2), contains one mol-ecule existing as a zwitterion. The N atom of the ammonio group is protonated and one of the phospho-nic acid groups is deprotonated. Bond lengths and angles are similar in both polymorphs. Besides the differences in cell parameters, the most significant structural difference between this structure and that of the first polymorph [Dudko, Bon, Kozachkova, Tsarik & Pekhno (2008 ▶), Ukr. Khim. Zh.74, 104-106] is the presence of strong symmetric hydrogen bonds between neighbouring phospho-nate groups. H atoms involved in these hydrogen bonds are located at inversion centres and O⋯O distances are observed in the range 2.458 (5)-2.523 (5) Å. These bonds and additional O-H⋯O and N-H⋯O hydrogen bonds inter-link the mol-ecules, giving a three-dimensional supromolecular network.
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