The Absorption of Phenyl Mustard Oil in the 4.8μ Region

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Abstract
An intensive study of the 4.8μ band of phenyl mustard oil has shown this band to have three components. Although these components have not been completely resolved, the present work indicates the frequencies involved to be 2130, 2080, and 1950 cm—1. The two highest frequencies have counterparts in the Raman spectrum, but the frequency 1950 cm—1 has not been observed by Raman methods. Fermi resonance is discussed as a possible explanation of the observed spectrum. Re‐investigation of the spectra of the methyl, ethyl, and phenyl nitriles and isonitriles failed to reveal complexities in the region of 2100 cm—1.
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