Raman Spectra and Internal Rotation of Ethyl Methyl Ether

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Abstract
The Raman spectra of ethyl methyl ether in the liquid state were measured at various temperatures from 298 K to 195 K. The energy difference between the gauche and trans isomers in the liquid state was found to be 1.1 kcal/mol. This value is appreciably higher than the value 0.77 kcal/mol for n-butane. The tendency of assuming the trans form is higher for the CH2–O bond than for the CH2–CH2 bond. The infrared intensity of the band at 465 cm−1 (gas) is largely due to the gauche isomer but the Raman intensity of the line at 471 cm−1 (liquid) is largely due to the trans isomer.

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