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Rotational spectra of gauche perfluoro-n-butane, C4F10; perfluoro-iso-butane, (CF3)3CF; and tris(trifluoromethyl)methane, (CF3)3CH |
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| Authors: | Michaeleen R. Munrow Ranga Subramanian Andrea J. Minei Matthew K. MacLeod Raul Crespo Mitsuaki Izuha Yoshio Tatamitani Kenji Yamanou Stewart E. Novick |
| Affiliation: | a Department of Chemistry, Wesleyan University, Middletown, CT 06459, USA b Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA c Departament de Quimica Fisica, Universitat de Valencia, E-46100 Burjassot, Spain d Department of Chemistry, Faculty of Science, Shizuoka University, Shizuoka 422-8529, Japan |
| Abstract: | The microwave spectra of the gauche conformer of perfluoro-n-butane, n-C4F10, of perfluoro-iso-butane, (CF3)3CF, and of tris(trifluoromethyl)methane, (CF3)3CH, have been observed and assigned. The rotational and centrifugal distortion constants for gauche n-C4F10 are: A = 1058.11750(7) MHz, B = 617.6832(1) MHz, C = 552.18794(1) MHz, ΔJ = 0.0257(5) kHz, δJ = 0.0052(3) kHz. A C-C-C-C dihedral angle, ω, of ∼55° has been determined. These values agree well with those obtained from a coupled cluster (CCSD/cc-PVTZ) calculation. The rotational and centrifugal distortion constants for iso-C4F10 and iso-C4HF9 are: Bo = 816.4519(4) MHz, DJ = 0.023(2) kHz, and Bo = 903.6985(25) MHz, DJ = 0.043(4) kHz, respectively. The dipole moment of iso-C4F10 and iso-C4HF9 have been measured and found to be 0.0338(8) and 1.69(9) D, respectively. |
| Keywords: | C4F10 Perfluorobutane (CF3)3CF Perfluoro-iso-butane (CF3)3CH Tris(trifluoromethyl)methane Conformations Microwave spectroscopy Fourier transform microwave spectroscopy Dipole moments |
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