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Fourier transform infrared (FTIR) absorption spectra in the 2000 to 3500 cm –1  range are reported for the gaseous  16  O,  16  O-  and  18  O,  18  O- isotopomers of tropolone[OH(OD)] at 25  o C. The spectral doublet component separations are near 20 and 19 cm –1  for  16  O,  16  O-  and  18  O,  18  O- Tp(OH), respectively, and near 7 and 6.5 cm –1  for  16  O,  16  O-  and  18  O,  18  O- Tp(OD). The spectra suggest the tautomerization tunneling mechanisms in these states are complex multidimensional processes including the participation of IVR. In general, the OHO isotope effects demonstrate a mixing of O atom displacement coordinates into the intramolecular dynamics for most of the vibrational states observed in the fundamental CH/OH(OD) stretching regions.

Infrared Absorption Spectra in the Hydroxyl Stretching Regions of Gaseous Tropolone OHO Isotopomers