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VIBRATIONAL SPECTRA OF 3-FLUOROCYCLOPROPENE AND 3-FLUOROCYCLOPROPENE-$d_{-3}$.
Norman C. Craig, Julianto Pranata, Julian R. Sprague, Philip S. Stevens
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Abstract
3-Fluorocyclopropene, a rather labile substance, was prepared from 3-chlorocyclopropene by reaction with $AgF_{2}/KF.^{1}$ Infrared and Raman spectra of 3-fluorocyclopropene and its $d_{3}$ isotopomer were recorded. Essentially complete assignments of vibrational fundamentals were made for these molecules. Frequencies for non-CF-rich modes correlate well with those for 3-chlorocyclopropene. In both molecules the two CX bending modes are nearly degenerate. For 3-fluorocyclopropene the fundamental frequencies (in $cm^{-1}$) are: $(a^{\\prime}) 3161, 3032, 1623, 1325, 1201, 956, 860(7), 660, 459; (a^{\\prime\\prime}) 3140, 1060, 1035, 876, 855, 442$. Frequency shifts between the gas-phase and condensed-phase spectra comparable to those caused by hydrogen bonding were found for 3-fluorocyclopropene as for 3-chlorocyclopropene. Results of normal coordinate calculations for the two isotopomers of 3-fluorocyclopropene will be reported.