Abstract
The rotational spectra of12CH235ClF,12CH237ClF, and13CH235ClF have been observed and analyzed in the frequency region 8–250 GHz with Stark, Fourier transform, and millimeter-wave spectrometers. Extensive assignments and frequency measurements were made for the ground states of the three isotopic species and for the lowest lying vibrational state in CH235ClF and CH237ClF associated with the deformation of the CClF angle, ν6. Accurate spectroscopic constants have been determined for all these states. The nuclear quadrupole coupling constants have been determined for the ground and excited states and have been transformed to their principal axis system. A structure ofrC–Cl= 1.7621(2) Å,rC–F= 1.370(1) Å,rC–H= 1.09(1) Å, 〈ClCF = 110.1(0.5)°, 〈ClCH = 109.4(3.0)°, and 〈HCH = 110.4(5.0)° was found to fit the observed moments of inertia.
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