Acta Crystallographica Section C

Crystal Structure Communications

Volume 62, Part 3 (March 2006)

organic compounds

jz1784 scheme

Acta Cryst. (2006). C62, o148-o152 [ doi:10.1107/S0108270106003374 ]

X-ray studies of crystalline complexes involving amino acids and peptides. XLIII. Adipic acid complexes of L- and DL-lysine

A. Sharma, S. Thamotharan, S. Roy and M. Vijayan

Abstract: The asymmetric unit of the DL-lysine complex of adipic acid [bis(DL-lysinium) adipate], 2C₆H₁₅N₂O₂⁺·C₆H₈O₄^2-, contains a zwitterionic singly charged lysinium cation and half a doubly charged adipate anion (the complete anion has inversion symmetry). That of the L-lysine complex (lysinium hydrogen adipate), C₆H₁₅N₂O₂⁺·C₆H₉O₄^-, consists of a lysinium cation and a singly charged hydrogen adipate anion. In both structures, the lysinium cations organize into layers interconnected by adipate or hydrogen adipate anions. However, the arrangement of the molecular ions in the layer is profoundly different in the DL- and L-lysine complexes. The hydrogen adipate anions in the L-lysine complex form linear arrays in which adjacent ions are interconnected by a symmetric OHO hydrogen bond.

Formula: 2C₆H₁₅N₂O₂⁺·C₆H₈O₄^2- and C₆H₁₅N₂O₂⁺·C₆H₉O₄^-


	Structure factor file (CIF format) (120.0 kbytes) [ doi:10.1107/S0108270106003374/jz1784Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (71.6 kbytes) [ doi:10.1107/S0108270106003374/jz1784IIsup3.hkl ] Contains datablock II

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