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

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      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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