Issue |
J. Chim. Phys.
Volume 66, 1969
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Page(s) | 449 - 458 | |
DOI | https://doi.org/10.1051/jcp/1969660449 | |
Published online | 28 May 2017 |
Spectres de vibration des acides isobutyriques (CH3)2CHCOOH, (CH3)2CHCOOD, (CH3)2CDCOOH, (CH3)2CDCOOD et de leurs sels de potassium et d'argent
Centre de Recherche Paul Pascal, Domaine universitaire, 33-Talence.
Laboratoire de Spectrochimie Moléculaire, 8, rue Cuvier, 75-Paris, 5 e.
Service de Chimie Physique CNRS, rue Henry-Dunant, 94-Thiais France.
Une attribution complète des spectres de vibration des acides isobutyriques (CH3)2CHCOOH, (CH3)2CHCOOD, (CH3)2 CDCOOH et (CH3)2CDCOOD et de leurs sels de potassium et d’argent est proposée. A l’état liquide, les acides existent principalement sous forme de dimères fermés; quelques absorptions faibles sont attribuables cependant à une faible quantité de dimères ouverts. A l’état solide, l’acide (CH3)2CHCOOH présente deux formes cristallines dans lesquelles les molécules sont associées en dimères fermés.
Abstract
Infrared and RAMAN spectra of (CH3)2CHCOOH, (CH3)2CHCOOD, (CH3)2CDCOOH and (CH3)2CDCOOD and of their potassium and silver salts were studied and various assignments were made for the observed frequencies. In liquid state, the acids exist for the most part as closed dimers. However some very weak absorptions were observed which are apparently due to the existence of a small quantity of open dimers. At the temperatures used for taking the spectra the acid (CH3)2CHCOOH has two crystalline forms, both cyclic dimers.
© Paris : Société de Chimie Physique, 1969