INFRARED SPECTRA OF SOME SOAPS OF PHENYLSTEARIC ACID
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Date
1954
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Ohio State University
Abstract
The infrared absorption spectra of solid films of Li, Na, K, Be, Mg, Ca, Sr, and Ba phenylstearate have been studied in the region from 2 to 15 microns. The carbonyl band, which appears at $1712 cm^{-1}$ in phenylstearic acid, disappears in the spectra of the soaps presumably because of ionization effects. Instead, a strong band is observed in the region from 1540 to $1620 cm^{-1}$. The frequency of this band appears to vary linearly with the Pauling electronegativity value of the metal constituent of the various soaps. In addition, the infrared spectra of solutions of lithium phenylstearate in chloroform and benzene have been studied in the region from 5 to 7 $\mu$. In such solutions, the lithium soap exhibits three bands at 1589, 1572, and $1543 cm^{-1}$, rather than a single band at $1587 cm^{-1}$ as observed in solid films. The relative intensities of these three bands are profoundly influenced by the addition of phenylstearic acid, by concentration, or by aging of the solutions. The strength of the band at $1543 cm^{-1}$ appears to be directly proportional and the band at $1572 cm^{-1}$ inversely proportional to the viscosity of the solutions, indicating that the formation of polymeric chains may be responsible for some of the observed spectral changes.
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Author Institution: Chemistry Division, Naval Research Laboratory