Alexandra Welzel, Arnim Hellweg, I. Merke
Sep 1, 2002
Citations
3
Influential Citations
23
Citations
Journal
Journal of Molecular Spectroscopy
Abstract
Abstract The microwave spectra of o -cresol and of o -cresol-OD were assigned using molecular beam Fourier transform microwave (MB-FTMW) spectrometers in the frequency range of 3–40 GHz. Two conformers of o -cresol were measured where the hydroxy group is syn with respect to the methyl group in one case and anti in the other. The transitions of both conformers were split due to internal rotation of the methyl group. For syn - o -cresol we found the rotational constants A =3249.45242(18) MHz, B =2202.02546(18) MHz, C =1323.66277(16) MHz, and the barrier to internal rotation of the methyl group V 3 =7.912(46) kJ mol −1 . In the case of anti - o -cresol A =3273.80084(18) MHz, B =2196.26747(18) MHz, C =1325.36424(22) MHz, and V 3 =4.4256(14) kJ mol −1 was obtained. Moreover we were able to determine the quartic centrifugal distortion constants, the angle between the internal rotor axes, and the inertial a axes, and, for the deuterated species, additionally the deuterium nuclear quadrupole coupling constants.