Tetra­methyl­ammonium hydrogen terephthalate

Dolatyari, L.; Shoghpour Bayraq, S.; Sharifi, S.; Ramazani, A.; Morsali, A.; Amiri Rudbari, H.

doi:10.1107/S1600536812039487

Acta Crystallographica Section E

Structure Reports Online

Volume 68, Part 10 (October 2012)

organic compounds

bg2478 scheme

Acta Cryst. (2012). E68, o3014-o3015 [ doi:10.1107/S1600536812039487 ]

Tetramethylammonium hydrogen terephthalate

L. Dolatyari, S. Shoghpour Bayraq, S. Sharifi, A. Ramazani, A. Morsali and H. Amiri Rudbari

Abstract: The asymmetric unit of the title salt, C₄H₁₂N⁺·C₈H₅O₄^-, contains one half of a tetramethylammonium cation and one half of a hydrogen terephthalate monoanion. The N atom of the ammonium cation lies on a twofold rotation axis and the centre of mass of the terephthalate anion is on a centre of inversion. In the crystal, the centrosymmetric terephthalate ions are linked by a very short symmetric O-HO hydrogen bond [OO = 2.4610 (19) Å] into a one-dimensional polymeric chain along [1-12]. The tetramethylammonium cations and terephthalate anions are then connected through a pair of bifurcated acceptor C-HO hydrogen bonds, generating a three-dimensional supramolecular network. The carboxylate groups at both ends of the terephthalate anion are charge-shared with an equal probability of 0.5.