Abstract
The microwave spectra of exo- and endo-norborneols and their isotopic species deuterated in the hydroxyl group have been investigated over the frequency range 8–40 GHz. Conventional Stark spectroscopy and microwave—microwave double resonance were used to assign Q and R-branch rotational transitions. From the measured transition frequencies the rotational constants A = 3605.9374(9) MHz, B = 1935.4207(8) MHz and C = 1752.3947(8) MHz have been fitted for exo-norborneol and A = 3151.4865(15) MHz, B = 2095.2483(24) MHz and C = 1914.7057(25) MHz for endo-norborneol. Quantitative measurements of the Stark splittings of selected transitions yielded the dipole components μ a = 0.53(9) D, μ b = 1.22(6) D and μ c = 0.294(4) D and the total dipole moment μ = 1.36(9) D of exo-norborneol. The spectroscopic constants of the deuterated species -were used to deduce the orientation of the hydroxyl group of the only conformer found for each isomer of norborneol.
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