Abstract
The rotational spectra of the —OH and —OD isotopologues of 3,4-difluorobenzyl alcohol have been measured by pulsed jet Fourier transform microwave spectroscopy. The spectrum of one conformer has been assigned, characterised by a OCα-C1C2 dihedral angle of approximately 50°, and with the hydroxyl group zusammen with respect to the meta-F atom. μ c-type transitions of the —OH species are split into two evenly spaced component lines by 0.132(2) MHz, showing that the CH2OH group undergoes a tunnelling motion which connects two equivalent minima above and below the aromatic ring. The barrier for the interconversion of the two mirror forms has been calculated to be 155 cm−1.
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