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The crystal and molecular structures of 1:1 cocrystals formed between sulfadimidine and each of three bipyridine-type molecules, namely 4,4′-bipyridine (1), 4- [(E)-2-(pyridin-4-yl)ethenyl]pyridine (2) and 4-[2-(pyridin- 4-yl)ethyl]pyridine (3), are described; 1 and 2 were characterised as acetone hemi-solvates. A common feature of the sulfadimidine molecules is the adoption of a shape approximating the letter L. Conformational variability of sulfadimidine as well as in the bipyridine-type molecules is highlighted. The common feature of the crystal packing is the formation of non-linear supramolecular chains sustained by amino- and amide-H…N(pyridyl) hydrogen bonds

1:1 Co-crystals of sulfadimidine with three bipyridine-type molecules: Persistence of N–H…N hydrogen bonded supramolecular chains