Abstract

The C≡N stretching frequency, <i>v</i>C≡N, is affected by change in the solvent and also by change in concentration in the same solvent. In the case of acetonitrile, <i>v</i>C≡N is in Fermi resonance with the combination tone (δ_sym. CH₃ + <i>v</i>C-C), and the degree of Fermi resonance interaction changes with change in the solvent. With the exception of dimethyl sulfoxide, unperturbed <i>v</i>C≡N for acetonitrile exhibits a pseudo-linear correlation with the acceptor number of the solvent.

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