Acta Cryst. (2005). E61, o992-o994  [ doi:10.1107/S1600536805007014 ]

L-Phenylalanine L-phenylalaninium malonate

M. Alagar, R. V. Krishnakumar, P. Parimala Devi and S. Natarajan

Abstract: The asymmetric unit of the title compound, C₉H₁₁NO₂·C₉H₁₂NO₂⁺·C₃H₃O₄^-, consists of two phenylalanine molecules, one as a zwitterion (P) and the other as a cation (P⁺), in addition to a malonate anion (Mal^-). The phenylalaninium and phenylalanine molecules are linked by a very short syn-syn carboxyl-carboxylate (-COO^-HOOC-) hydrogen bond [OO = 2.429  (4)  Å]. The Mal^- anion is stabilized by a strong intramolecular O-HO hydrogen bond. The aggregation of P and P⁺ is mediated through Mal^-, leading to an infinite double chain along the c axis.

Online 18 March 2005

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