The linear solvation energy relationship (LSER) concept is shown to apply to i.r. spectra. Solvatochromic shifts of a variety of X = O, C–Cl, and O–H ⋯ B stretching frequencies and solvent effects on absorption intensities are linear with solvent π*-values. Values of s in the solvatochromic equation, ν![[ν with combining macron]](https://www.rsc.org/images/entities/char_03bd_0304.gif)
=ν0+sπ*, are related to chromophore structures.
M. J. Kamlet and R. W. Taft, J. Chem. Soc., Perkin Trans. 2, 1979, 337 DOI: 10.1039/P29790000337
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