MICROWAVE-SPECTRUM OF ISOPROPYL FLUORIDE AND STRUCTURE OF ISOPROPYL HALIDES

The microwave spectra of iso-propyl fluoride and its isotopically substituted species were measured. The rotational constants and the coefficients of the first four terms of the quartic centifugal distortion were determined from the observed frequencies. The rs structure of the molecule was determined from the observed moments of inertia. Stark-effect measurements of several low J transitions were carried out for the normal and (CD3)2CHF species. The dipole moment of the normal species of iso-propyl fluoride has components of μb=1.880±0.007 D and μc=0.540±0.022 D; the total dipole moment μtotal=1.956±0.009 D; it makes an angle of 3°52′ with the CF bond and inclines its positive pole towards the (CH3)2C group. The structure and dipole moment of iso-propyl fluoride are compared with those of the other iso-propyl halides and ethyl halides. © 1990.