The centre of gravity (ν![[> with combining macron]](https://www.rsc.org/images/entities/char_003e_0304.gif)
H) of the continuous absorption in the i.r. spectra of three substituted pyridine trifuloracetates in dry benzene varies by up to 9% over the concentration range 0.07%–0.6 M and reflects the dipole interaction of hydrogen bonds with the field from their environment.
Z. Dega-Szafran and M. Szafran, J. Chem. Soc., Chem. Commun., 1984, 1470 DOI: 10.1039/C39840001470
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