Acta Cryst. (2013). C69, 1537-1540 [ doi:10.1107/S0108270113030801 ]
Synopsis: Two salts obtained from the proton-transfer reactions of benzene-1,2,4,5-tetracarboxylic acid (pyromellitic acid, PMA) with 2,2'-biimidazole and 4,4'-dimethyl-2,2'-bipyridine form one-dimensional O-HO hydrogen-bonded chain structures extended into two-dimensional supramolecular layers and sheets via O-HO and N-HO hydrogen bonding.
Formula: C6H8N42+·C10H4O82- and C12H13N2+·C10H5O8-·H2O
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