Microwave Spectra of Molecules Exhibiting Internal Rotation. IV. Isobutane, Tertiary Butyl Fluoride, and Trimethylphospine

摘要: Several microwave transitions of (CH3)3CH, (CH3)3CF, and (CH3)3P have been measured assigned. Rotational constants B0 for the three molecules are 7789.45, 4712.15, 5816.24 Mc, respectively. Molecular structures dipole moments determined. The (CH3)3CF structure indicates an unusually long CF bond. prominent satellite lines assigned to excited vibrational states; l‐type doubling pattern in degenerate states has fitted theory. Vibrational frequencies determined from relative intensity measurements agree with infrared Raman results but indicate incorrect species assignment (CH3)3P. Frequencies torsional vibrations used derive information potential function internal rotation. leading Fourier coefficient this is 3900, 4300, 2600 cal/mole, respectively, terms representing interactions among CH3 groups much smaller.