Abstract
Abstract The microwave spectrum of isopropyl cyanide, (CH 3 ) 2 CHCN, has been recorded from 26.5 to 40.0 GHz. Both A- and C-type transitions were observed. The R-branch assignments have been made for the ground and three different excited states. The following structural parameters were obtained: r (C-CN) = 1.501 A, ∠CCC = 113.8°, and an angle between the CCC plane and the CN bond of 53.8° with reasonable assumptions made for the structural parameters for the isopropyl moiety and the nitrile bond. The dipole moment components were determined to be μ a = 4.05±0.02, μ c = 1.4 ± 0.2 and μ t = 4.29 ±0.10 D. The dipole moment of t-butyl cyanide has been re-measured and found to have a value of4.34±0.04 D. From the relative intensities of the excited state lines, the two torsional modes were found to have frequencies of 200 ±20 and 249 ±10 cm −1 which gave a periodic barrier to internal rotation of 3.3 kcal mole −1 .
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