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The 1 : 1 co-crystallisation experiments conducted between 1,2,4,5-benzenetetracarboxylic acid, LH 4 , and each of 2,2′-dipyridyldisulfide (2-PA) and 4,4′-dipyridyldisulfide (4-PA) resulted in the formation of two salts of distinct formulation,  i.e . [LH 4 ] 0.5 [2-PAH][LH 3 ] ( 1 ) and [LH 2 ][4-PAH 2 ] ( 2 ), respectively, indicating that proton transfer had occurred during crystallisation. In  1 , a framework structure constructed by hydrogen bonded (O—H … O) LH 4  and LH 3  -0  species defines channels in which reside 2-PAH cations that feature  syn  geometries and intramolecular N—H … N hydrogen bonds. By contrast, in  2 , direct N—H … N links between cations and anions lead to zigzag supramolecular chains.

1:1 Co-crystallisation of 1,2,4,5-benzenetetracarboxylic acid (LH 4 ) with isomeric 2,2′-dipyridyldisulfide (2-PA) and 4,4′-dipyridyldisulfide (4-PA)