Abstract
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.
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