The Donor-Acceptor Complex between 4,6,8-Trimethylazulene and Picric Acid

Slow cooling of an equimolar mixture of 4,6,8-trimethylazulene and picric acid (2,4,6-trinitrophenol) in ethanol yields crystals of an 1:1 donor-acceptor complex, C₁₃H₁₄.C₆H₃N₃O₇, the structure of which has been determined by X-ray diffraction at 200 K. The donor and acceptor molecules alternate in mixed stacks along the [001] direction. All geometric parameters of the donor as well as the acceptor molecules are comparable to those in isolated 4,6,8-trimethylazulene and picric acid.

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