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Solvent-Induced Nitrile Frequency Shifts: Acetonitrile and Benzonitrile

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Abstract:

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

Keywords: Fermi resonance with CN stretching; Infrared; Solvent effects

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370290789619649

Affiliations: Analytical Sciences Laboratories, 1897 Building, The Dow Chemical Company, Midland Division, U.S.A., Midland, Michigan 48667

Publication date: September 1, 1990

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