A 1 : 1 co-crystal of quinol and pyridine

I D H Oswald, W D S Motherwell, S Parsons

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21 Citations (Scopus)


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...pi and pi-pi stacking interactions are energetically competitive with O-H...N hydrogen bonds. Quinol molecules lie on inversion centres, while pyridine is in a general position.

Original languageEnglish
Pages (from-to)O1967-O1969
Number of pages3
JournalActa Crystallographica Section E: Structure Reports
Issue numberPart 11
Publication statusPublished - Nov 2004


  • single-crystal X-ray study
  • T = 150 K
  • co-crystal
  • pyridine
  • quinol


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