Complete Structure of Gauche 1,1,2,2-Tetrafluoroethane Determined by Microwave Spectroscopy

Published

October 1, 2000

Author(s)

B Mate, Angela R. Hight Walker, R D. Suenram, N Craig

Abstract

The complete molecular structure of the high-energy, gauche rotamer of 1,1,2,2-tetrafluoroethane (TFEA), Freon F134, has been determined using Fourier transform microwave spectroscopy. A total of 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 _c = 8.186(7) x 10^-30 C m [2.454(2) Debye]. The experimental results for the geometric parameters of TFEA are compared with two recent ab initio calculations.

Citation

Journal of Physical Chemistry A

Volume

104

Issue

No. 42

Pub Type

Journals

Keywords

1, 1, 2, 2-tetrafluoroethane, electric dipole moment, F134, fourier transform microwave spectrum, microwave

Citation

Mate, B. , Hight, A. , Suenram, R. and Craig, N. (2000), Complete Structure of Gauche 1,1,2,2-Tetrafluoroethane Determined by Microwave Spectroscopy, Journal of Physical Chemistry A (Accessed April 25, 2024)