Rotational Spectrum, Structure, and Interaction Energy of the Trifluoroethylene···Carbon Dioxide Complex.
Rotational spectra for four isotopologues of the 1:1 weakly bound complex between trifluoroethylene (HFC═CF2) and carbon dioxide (CO2) were recorded using 480 MHz bandwidth chirped-pulse and resonant cavity Fourier transform microwave spectroscopy between 5.0 and 18.5 GHz. Two planar forms are possible: experimental rotational constants, planar moments, and dipole moment components are consistent with the form in which CO2is positioned at the CHF end of the TFE subunit and is approximately perpendicular to the C═C bond; the other form, with CO2aligned roughly parallel to the C═C bond, is not observed, consistent with ab initio relative energy predictions. Symmetry-adapted perturbation theory (SAPT) calculations provided interaction energies for possible structural forms of this complex, and comparisons are made with this and other members of the series of carbon dioxide complexes with fluorinated ethylenes (vinyl fluoride, 1,1-difluoroethylene, cis- and trans-1,2-difluoroethylene, and trifluoroethylene).
Department of Chemistry, Eastern Illinois University , 600 Lincoln Avenue, Charleston, Illinois 61920 United States.
Rachel E
RE
Dorris
Department of Chemistry, Eastern Illinois University , 600 Lincoln Avenue, Charleston, Illinois 61920 United States.
William C
WC
Trendell
Department of Chemistry, Eastern Illinois University , 600 Lincoln Avenue, Charleston, Illinois 61920 United States.
Rebecca A
RA
Peebles
Department of Chemistry, Eastern Illinois University , 600 Lincoln Avenue, Charleston, Illinois 61920 United States.
Sean A
SA
Peebles