Synthon polymorphism and pseudopolymorphism in co-crystals. The 4,4'-bipyridine-4-hydroxybenzoic acid structural landscape.


Co-crystals of 4,4'-bipyridine and 4-hydroxybenzoic acid (1 : 2) show synthon polymorphism with the former being more stable. A 2 : 1 co-crystal is pseudopolymorphic within the same structural landscape with the structural roles of the two bipyridine N-atoms being distinct, as evidenced by mimicry by 4-phenylpyridine. 
DOI: 10.1039/c0cc05857b

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