Organic co-crystals of 1,3-bis(4-pyridyl)azulene with a series of hydrogen-bond donors

What is it about?

The supramolecular interactions between 1,3-bis(4-pyridyl)azulene (azbbpy) as a hydrogen bond acceptor and a variety of aromatic hydrogen-bond donors produced new binary molecular co-crystals and a salt. All crystal structures display extensive and very complex hydrogen bond networks containing both homo- and heterosynthons formed through robust O–H⋯N and OH⋯O hydrogen bonds.

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Why is it important?

The optical properties of these supramolecular systems showed strong absorption bands in the visible region due to the azulene fragment.