Essai dinterprétation de linfluence dun solvant non polaire sur la fréquence de vibration du groupement carbonyleReport as inadecuate




Essai dinterprétation de linfluence dun solvant non polaire sur la fréquence de vibration du groupement carbonyle - Download this document for free, or read online. Document in PDF available to download.



Abstract : Results precedently obtained have shown that the vibrational frequency of the carbonyl group, about 1 700 cm-1, increases appreciably when the compound studied is diluted with a non-polar solvent. This increase can be regarded as the sum of a coupling effect between molecules and the - Kirkwood effect - relative to the frequency shift of an oscillator in terms of the dielectric constant of the medium. The respective share of these two effects has been shown by coupling the carbonyl group in an hydrogen-bondedjcomplex that eliminates the coupling effect, and by studying the infra-red spectra of this complex diluted with hexane. It seems that the - Kirkoowd effect - is often predominant.

Keywords : infrared spectra





Author: M. M. Bottreau J. Gerbier E. Gray

Source: https://hal.archives-ouvertes.fr/



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