In C–H ⋯ O hydrogen bonds, the average C ⋯ O and H ⋯ O separations depend on the nature of the acceptor O atoms: they obey the trends observed as for the conventional O–H and N–H donors, with a ranking of acceptor strengths C![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
O > NO2 > SO > C–OH > C–O–C.
T. Steiner, J. Chem. Soc., Chem. Commun., 1994, 2341 DOI: 10.1039/C39940002341
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