Solvent effects on the infra-red frequency and intensity of the nitrile vibration in aceto-, propio-, benzo- and phthalo-nitriles
✍ Scribed by N.S. Bayliss; A.R.H. Cole; L.H. Little
- Publisher
- Elsevier Science
- Year
- 1959
- Weight
- 597 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0371-1951
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✦ Synopsis
Ab&ac&The &rile tiquenoy displacements relative to the vapour are substantial but almost independent of solvent. The intensities axe conversely very solvent-dependent, those in CHOrOform being for example over twice those in &octane. Neither effect is explained by current theoretical treatments. The authors suggest that the high local field of the CN group may modify solvent properties.
The CN intensity in the aromatic nitriles is greater than in the aliphatic, and the intensity ratio between benzo-and phthalonitrile is accounted for by the Hammett u-factor.
The empirical solvent sequence found by .hKEuB~D and PULLIN for CO 'frequencies is also valid for CN intensities, which when plotted solvent by solvent correlate linearly with each other and also with CO frequencies.
The same correlation exists approximately for CN frequencies.