MICROWAVE INVESTIGATION OF THE GROUND AND FIRST EXCITED TORSIONAL STATES OF ACETIC ACID MONOHYDRATE.
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Date
2008
Journal Title
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Volume Title
Publisher
Ohio State University
Abstract
Rotational spectra of CH$_{3}$COOH-H$_{2}$O and $^{13}$CH$_{3}$COOH-H$_{2}$O have been observed by Fourier transform microwave spectroscopy. A total of 14 A state and 13 E state transitions have been analyzed. The resulting rotational constants are consistent with a structure similar to that of acetic acid dimer, where the water moiety forms a primary hydrogen bond with the carboxylic acid proton and a secondary hydrogen bond with the carbonyl oxygen. The barrier to internal rotation of the methyl group was determined to be 138.45(3) cm$^{-1}$, which represents a decrease of 18.7\% when compared with that of the acetic acid monomer.
Description
Author Institution: University of Minnesota, Department of Chemistry, 207 Pleasant St; SE, Minneapolis MN 55455