Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 9 (September 2007)

organic compounds

av3090 scheme

Acta Cryst. (2007). C63, o514-o517 [ doi:10.1107/S0108270107022469 ]

4-Carboxyanilinium (2R,3R)-tartrate and a redetermination of the -polymorph of 4-aminobenzoic acid

S. Athimoolam and S. Natarajan

Abstract: In the title compounds, 4-carboxyanilinium (2R,3R)-tartrate, C₇H₈NO₂⁺·C₄H₅O₆^-, (I), and 4-aminobenzoic acid, C₇H₇NO₂, (II), the carboxyl planes of the 4-carboxyanilinium cations/4-aminobenzoic acid are twisted from the aromatic plane. In (I), the characteristic head-to-tail interactions are observed through the tartrate anions, forming two C₂²(7) chain motifs propagating parallel to the a and c axes of the unit cell. Also, the tartrate anions are connected through two primary C₁¹(6) and C₁¹(7) chain motifs, leading to a secondary R₄⁴(22) ring motif. In (II), head-to-tail interaction is seen through a discrete D₁¹(2) motif and carboxyl group dimerization is observed through centrosymmetrically related R₂²(8) motifs around the inversion centres of the unit cell. The crystal structures of both compounds are stabilized by intricate three-dimensional hydrogen-bonding networks. Alternate hydrophobic and hydrophilic layers are observed in (I) as a result of a column-like arrangement of the anions and the aromatic rings of the cations.

Formula: C₇H₈NO₂⁺·C₄H₅O₆^- and C₇H₇NO₂


	Structure factor file (CIF format) (130.8 kbytes) [ doi:10.1107/S0108270107022469/av3090Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (136.8 kbytes) [ doi:10.1107/S0108270107022469/av3090IIsup3.hkl ] Contains datablock II

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