VIBRATIONAL ASSIGNMENTS OF TRIFLUOROACETIC ACID AND DERIVATIVES
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Date
1959
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Ohio State University
Abstract
The Raman spectra of trifluoroacetic acid, the trifluoroacetate ion, methyl trifluoroacetate, and also trifluoroacetamide and its N-methyl derivatives have been observed in the condensed phase either as pure liquids or as aqueous solutions. Assignments of the fundamental vibrations of trifluoroacetic acid and trifluoroacetamide have been aided by spectra obtained of the deuterated compounds. Results of the qualitative polarization study for deuterated trifluoroacetic acid suggest a low order of symmetry. A similar conclusion for trifluoroacetic acid based on the latter’s polarization data is less certain due to the presence of several highly depolarized bands. The great similarity of the trifluoroacetate ion the the isoelectronic $CF_{2}NO_{2}$ molecule is illustrated by a comparison of their respective vibrational assignments. Fundamental frequencies of methyl trifluoroacetate and the corresponding N-methyl trifluoroacetamides have been assigned using recent literature data for the corresponding nonfluorinated compounds in addition to the assignments proposed for the parent compounds.
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Author Institution: Research Laboratory, Shell Oil Company; Dept. of Chemistry, The University of Michigan