A co-crystal of quinol and pyridine would be expected to form with 1:2 stoichiometry because quinol has two hydrogen-bond donors and pyridine has one hydrogen-bond acceptor which is more basic than phenolic oxygen. We report the structure of a 1:1 co-crystal, viz. quinol–pyridine (1/1), C6H6O2·C5H5N, which does not conform to this expectation. Its stability appears to imply that a combination of individually relatively weak C—H⋯O, C—H⋯π and π–π stacking interactions are energetically competitive with O—H⋯N hydrogen bonds. Quinol molecules lie on inversion centres, while pyridine is in a general position.
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Oswald et al. (2004) studied this question.
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