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A comparative study of two polymorphs of L-aspartic acid hydrochloride

Abstract : Two polymorphs of l-aspartic acid hydrochloride, C4H8NO4+center dot Cl-, were obtained from the same aqueous solution. Their crystal structures have been determined from single-crystal data collected at 100 K. The crystal structures revealed three-and two-dimensional hydrogen-bonding networks for the triclinic and orthorhombic polymorphs, respectively. The cations and anions are connected to one another via N-H center dot center dot center dot Cl and O-H center dot center dot center dot Cl interactions and form alternating cation-anion layer-like structures. The two polymorphs share common structural features; however, the conformations of the l-aspartate cations and the crystal packings are different. Furthermore, the molecular packing of the orthorhombic polymorph contains more interesting interactions which seems to be a favourable factor for more efficient charge transfer within the crystal.
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Rim Benali-Cherif, Radhwane Takouachet, El-Eulmi Bendeif, Nourredine Benali-Cherif. A comparative study of two polymorphs of L-aspartic acid hydrochloride. Acta Crystallographica Section C : Crystal Structure Communications [1968-2013], International Union of Crystallography, 2014, 70 (7), pp.689+. ⟨10.1107/S2053229614013163⟩. ⟨hal-01521183⟩



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