Infra-Red Spectra of Propane, 1-Deuteropropane, and 2-Deuteropropane and Some Revisions in the Vibrational Assignments for Propane

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Abstract
The infra‐red spectra of propane, 1‐deuteropropane, and 2‐deuteropropane are presented. The spectrum of propane does not have the bands at 720 and 1179 cm−1 reported by Wu and Barker. The vibrational modes of the three molecules are described. The 748‐cm−1 band in the propane spectrum is unambiguously assigned to rocking of the CH2 group about an axis normal to the molecular axis and in the C3 plane; and the 1053‐cm−1 band is unambiguously assigned to rocking of the CH2 group about an axis normal to the C3 plane. Unambiguous assignments for the remaining bands below 1350 cm−1 in the propane spectrum were not possible without an elaborate theoretical treatment beyond the scope of this paper.

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