Acta Cryst. (2003). E59, o31-o33  [ doi:10.1107/S1600536802022298 ]

DL-Methioninium trichloroacetate at 123 K

K. Rajagopal, R. V. Krishnakumar, A. Mostad and S. Natarajan

Abstract: In the title compound, C₅H₁₂NO₂S⁺·C₂Cl₃O₂^-, the methionine molecule exists as a cation with a protonated amino group and an uncharged carboxylic acid group, while the trichloroacetic acid molecule exists as an anion. The assembly of methioninium and trichloroacetate ions, leading to layers parallel to the ab plane, is characterized by a strong O-HO-type hydrogen bond between the carboxylic acid and carboxylate groups of the respective ions. A head-to-tail hydrogen bond is also observed between the methioninium cations, in addition to SCl, ClCl and ClO short contacts.

Online 19 December 2002

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