INFRARED AND RAMAN SPECTROSCOPIC STUDY OF SOME PERFLUOROMETHYL COMPOUNDS$^{\ast}$
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Date
1952
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
$CF_{3}COOH, CF_{3}COOD, CF_{3}CN$ and other perfluoromethyl compounds have been studied by means of infrared and Raman spectroscopy. For the two carboxylic acids, the OH stretching and $C = O$ stretching absorption bands each were resolved into two components, the higher frequency component corresponding to the vibration of the monomer, the other one to the vibration of the associated molecule. Other carboxylic band assignments are made in the light of recent $work,^{1,2,3}$ The location of the free $C = O$ band in the infrared spectrum of the acids has been found at about $1825 cm^{-1}$ in the vapor state. This is the highest carbonyl frequency reported as far as we know for a carboxylic acid. The $C = N$ stretching frequency of perfluoromethylcyanide is also high. Band assignments have been made for some of the $CF_{3}$ vibrations on the basis of additional experimental work as well as of literature references on related $molecules. ^{4,5,6}$
Description
$^{\ast}$Supported in part by a grant to Fisk University from the Research Corporation. $^{1}$ O. Thomas, Discussions of the Faraday Society 9:335, 339 (1950) $^{2}$ M. St. C. Flett, J. Chem. Soc. London, p. 962 (1951) $^{3}$ D. Hadzi and N. Sheppard. ``The Assignment of the infrared frequencies of the COOH group in carboxylic acid dimers,'' paper given at the International Meeting of Spectroscopists in Basel, Switzerland, June 28-30, 1951 $^{4}$ R. D. Cowan, G. Herzberg, and S. P. Sinha, J. Chem. Phys. 18:1538 (1950) $^{5}$ J. R. Nielson, N. H. Classen, and D. C. Smith, J. of Chem. Phys. 18:1471 (1950) $^{6}$ H. Schechter and F. Conrad, J. Am. Chem. Soc. 72:3371 (1950)
Author Institution: Fisk University; Tennessee A. and I. State University.; Vanderbilt University
Author Institution: Fisk University; Tennessee A. and I. State University.; Vanderbilt University