Abstract
The infrared spectra of gaseous, liquid and solid methyl acetate and its deuterium derivatives have been investigated from 4000 to 200 cm −1. The absorption spectrum of the crystalline state of each isotope has also been measured down to 33 cm −1, but the methyl torsional modes were not resolved. Raman spectra of the gaseous, liquid and solid states were obtained between 100 and 4000 cm −1. It is concluded that methyl acetate is present as a single molecular conformation in the temperature range studied since there is a one to one correspondence between the infrared and Raman transitions measured at ambient and liquid nitrogen temperatures. An assignment of the 27 normal modes, based upon relative band intensities, isotopic shift ratios and group frequency correlations is presented.
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