The length of the S ⋯ O intramolecular contact [2·255(8)Å] in 2-(5-phenyl-1,2-dithiole-3-ylidene)cyclohexanone (II) as determined by X-ray diffraction supports a distance vs. infrared spectral correlation for compounds with S ⋯ O (ketone) intramolecular contacts.
R. Pinel, Y. Mollier, E. C. Liaguno and I. C. Paul, J. Chem. Soc. D, 1971, 1352 DOI: 10.1039/C29710001352
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