%0 Journal Article
%T Bis(tetramethylamonium) bis(2,4,5-carboxybenzoate)¨Cbenzene-1,2,4,5-tetracarboxylic acid (1/1)
%A Lu¨ªs Cunha-Silva
%A Penka I. Girginova
%A Tito Trindade
%A Jo£¿o Rocha
%J Acta Crystallographica Section E
%D 2008
%I International Union of Crystallography
%R 10.1107/s1600536807062381
%X The asymmetric unit of the title compound, 2C4H12N+¡¤2C10H5O8 ¡¤C10H6O8, consists of a tetramethylamonium cation, an anion derived from the singly deprotonated pyromellitic acid anion, 2,4,5-carboxybenzoate (H3bta ), and one-half of a benzene-1,2,4,5-tetracarboxylic acid (H4bta) molecule, which has the centroid of the aromatic ring positioned at a crystallographic centre of inversion. The H4bta and H3bta  residues are involved in an extensive intermolecular O¡ªH...O hydrogen-bonding network, which leads to a three-dimensional supramolecular structure containing one-dimensional channels running parallel to the [001] crystallographic direction. These channels house the tetramethylamonium cations.
%U http://scripts.iucr.org/cgi-bin/paper?S1600536807062381