Complete Structure of Gauche 1,1,2, 2-Tetrafluoroethane Determined by Microwave Spectroscopy
Abstract
The complete molecular structure of the high-energy gauche rotamer of 1,1,2,2-tetrafluoroethane (TFEA), Freon F134, has been determined using pulsed-molecular-beam Fourier transform microwave spectroscopy. Five different 13C- and 2H-substituted isotopomers, in addition to the normal species, were studied. Unlike the nonpolar anti rotamer, the gauche form has a permanent electric dipole moment, which permits a direct rotational analysis. The electric dipole moment was also determined using the Stark effect of two low-J transitions. The resulting dipole moment is μc = 8.186(7) × 10-30 C m [2.454(2) Debye] where the numbers in parentheses are the standard uncertainties (i.e., 1σ). The experimental results for the geometric parameters of TFEA are compared with two recent ab initio calculations.
Repository Citation
Maté, Belén , Angela Hight Walker, R. D. Suenram, and Norman C. Craig. 2000. "Complete Structure of Gauche 1,1,2, 2-Tetrafluoroethane Determined by Microwave Spectroscopy." The Journal of Physical Chemistry A 104(42): 9489-9493.
Publisher
American Chemical Society
Publication Date
1-1-2000
Publication Title
Journal of Physical Chemistry A
Department
Chemistry and Biochemistry
Document Type
Article
DOI
https://dx.doi.org/10.1021/jp001913i
Language
English
Format
text
