Acta Crystallographica Section C

Volume 65, Part 7 (July 2009)

organic compounds

eg3019 scheme

Acta Cryst. (2009). C65, o357-o360 [ doi:10.1107/S0108270109024093 ]

A pair of diastereomeric 1:1 salts of (S)- and (R)-2-methylpiperazine with (2S,3S)-tartaric acid

H. Katagiri, M. Morimoto and K. Sakai

Abstract: The structures of diastereomeric pairs consisting of (S)- and (R)-2-methylpiperazine with (2S,3S)-tartaric acid are both 1:1 salts, namely (S)-2-methylpiperazinium (2S,3S)-tartrate dihydrate, C₅H₁₄N₂²⁺·C₄H₄O₆^2-·2H₂O, (I), and (R)-2-methylpiperazinium (2S,3S)-tartrate dihydrate, C₅H₁₄N₂²⁺·C₄H₄O₆^2-·2H₂O, (II), which reveal the formation of well defined ammonium carboxylate salts linked via strong intermolecular hydrogen bonds. Unlike the situation in the more soluble salt (II), the alternating columns of tartrate and ammonium ions of the less soluble salt (I) are packed neatly in a grid around the a axis, which incorporates water molecules at regular intervals. The increased efficiency of packing for (I) is evident in its lower `packing coefficient', and the hydrogen-bond contribution is stronger in the more soluble salt (II).

Formula: Two C₅H₁₄N₂²⁺·C₄H₄O₆^2-·2H₂O salts


	Structure factor file (CIF format) (74.3 kbytes) [ doi:10.1107/S0108270109024093/eg3019Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (83.6 kbytes) [ doi:10.1107/S0108270109024093/eg3019IIsup3.hkl ] Contains datablock II

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