THE STRUCTURE OF THE \textit{TRANS}-1,2-DIFLUOROETHYLENE--HF COMPLEX
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Date
2009
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Ohio State University
Abstract
To understand the effects of fluorine substitution in ethylene on intermolecular interactions, we have expanded our work on the Fourier transform microwave spectroscopy of \textit{trans}-1,2-difluoroethylene--HF reported last year}$ OSU International Symposium on Molecular Spectroscopy, Talk WF04 (2008).} to include six isotopomers: the most abundant, its DF counterpart, and four singly substituted $^{13}$C species in natural abundance. The spectra are analyzed with the inclusion of the hydrogen-fluorine spin-spin coupling interaction in the HF subunit, or for those complexes containing DF, the deuterium nuclear quadrupole coupling interaction. Analysis of the rotational and hyperfine constants gives a planar complex, with a hydrogen bond formed between HF and one of the F atoms in \textit{trans}-1,2-difluoroethylene. As with similar complexes, the hydrogen bond bends to allow the F atom in HF to interact with an H atom in the ethylene subunit. Although there are two possible sites for this secondary interaction, namely the H atoms vicinal and geminal to the hydrogen bonded F atom, only the interaction involving the former H atom is observed. The structure of this complex will be compared with those of similar complexes with different patterns of F atom substitution in the ethylene subunit.
Description
B.~K.~Amberger, H.~O.~Leung, and M.~D.~Marshall, The 63$^{\textrm{rd
Author Institution: Department of Chemistry, Amherst College, P.O. Box 5000, Amherst, MA 01002-5000
Author Institution: Department of Chemistry, Amherst College, P.O. Box 5000, Amherst, MA 01002-5000