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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