Acta Crystallographica Section C

Crystal Structure Communications

Volume 62, Part 9 (September 2006)

organic compounds

dn3021 scheme

Acta Cryst. (2006). C62, o567-o570 [ doi:10.1107/S0108270106029209 ]

L-Prolinium picrate and 2-methylpyridinium picrate

K. Anitha, S. Athimoolam and S. Natarajan

Abstract: In the structure of L-prolinium picrate, C₅H₁₀NO₂⁺·C₆H₂N₃O₇^-, the C atom of the pyrrolidine ring has conformational disorder. Both the major and minor conformers of the pyrrolidine ring adopt conformations intermediate between a half-chair and an envelope. Both the cation and anion are packed through chelated three-centred N-HO hydrogen bonds. The prolinium cation connects two different picrate anions, leading to an infinite chain running along the b axis. In 2-methylpyridinium picrate, C₆H₈N⁺·C₆H₂N₃O₇^-, the cations and anions are packed separately along the a axis and are interconnected by N-HO hydrogen bonds. Intramolecular contacts between phenolate O atoms and adjacent nitro groups are identified in both structures. A graph-set motif of R₁²(6) is observed in both structures.

Formula: C₅H₁₀NO₂⁺·C₆H₂N₃O₇^- and C₆H₈N⁺·C₆H₂N₃O₇^-


	Structure factor file (CIF format) (106.2 kbytes) [ doi:10.1107/S0108270106029209/dn3021Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (228.5 kbytes) [ doi:10.1107/S0108270106029209/dn3021IIsup3.hkl ] Contains datablock II

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