(IUCr) Crystallography Journals Online

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Acta Cryst. (2004). E60, o386-o388 [ doi:10.1107/S1600536804003277 ]

DL-Threoninium maleate at 150 K

K. Rajagopal, E. Ramachandran, A. Mostad and S. Natarajan

Abstract: In the title compound, C₄H₁₀NO₃⁺·C₄H₃O₄^-, the threonine molecule exists as a cation and the maleic acid molecule exists in the mono-ionized state. In the semi-maleate ion, there is an intramolecular O-HO hydrogen bond. The molecules aggregate into infinite parallel layers which extend in the (0 $\overline 2$ 2) plane. These layers have no hydrogen-bonded interactions between them, only van der Waals interactions. The semi-maleate ion is essentially planar. The structure is stabilized by O-HO and N-HO hydrogen bonds, in addition to weak C-HO interactions. No classical head-to-tail hydrogen bonds are observed.

Online 20 February 2004