Abstract
The infrared and Raman spectra of isopropyl methyl selenide and diisopropyl selenide were measured for the liquid and solid states. The fundamental vibrations were assigned and the rotational isomerism was studied on the basis of the spectral observations and the normal coordinate treatment. For isopropyl methyl selenide, the C1 and Cs forms coexisted in the liquid state and the enthalpy difference between them was obtained as ΔH(C2–Cs)=−0.52×0.05 kcal mol−1. For diisopropyl selenide, it was presumed that only the C2 form persisted in the solid state while the C2, Cs, and C1 forms coexisted in the liquid state, the C2 form being the most stable.
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