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Published on: April 9, 2017
A comparative study of two polymorphs of L-aspartic acid hydrochloride
Rim Benali-Cherif1, Radhwane Takouachet1, El-Eulmi Bendeif2
1Laboratoire des Structures, Propriétés et Interactions Interatomiques, Université Abbes Laghrour-Khenchela, 40000 Khenchela, Algeria.
Abstract:
Two polymorphs of L-aspartic acid hydrochloride, C4H8NO4(+)·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···Cl and O-H···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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