Acta Cryst. (2005). E61, o313-o316  [ doi:10.1107/S1600536805000152 ]

The 1:1 proton-transfer compound of 5-sulfosalicylic acid with 4-aminobenzoic acid

G. Smith, U. D. Wermuth and J. M. White

Abstract: The crystal structure of the anhydrous 1:1 proton-transfer compound of 5-sulfosalicylic acid (3-carboxy-4-hydroxybenzenesulfonic acid) with 4-aminobenzoic acid, viz. 4-carboxyanilinium 3-carboxy-4-hydroxybenzenesulfonate, C₇H₈NO₂⁺·C₇H₅O₆S^-, displays a hydrogen-bonded polymeric network structure involving primarily all aminium H-atom donors and sulfonate O-atom acceptors, and is propagated through homomolecular cyclic tail-to-tail interactions between the carboxylic acid substituent groups of both cation and anion species. In addition, there are some cation-anion - stacking associations.

Online 15 January 2005

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