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VIBRATIONAL SPECTRA OF 1-FLUOROCYCLOBUTENE
Norman C. Craig, Steven S. Borick, Thomas R. Tucker
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Abstract
Gas-phase intrared and liqid-phase Raman spectra have been recorded for 1-fluorocyclobutene. a new substance. For this molecule of $C_{s}$ symmetry we propose a complete assignment of vibrational fundamentals. They are In $cm^{-1}: (a)3111, 2954, 2948, 1667, 1464, 1437, 1306, 1214, 1189, 1154, 972, 911, 866, 651, 412; (a) 2982, 2969, 1140, 1076, 1020, 855, 764, 436, 264$. These assignments correlate well with those of 1-chlorocyclobutene$1$ but not so well with some of the out-of-plane modes in the published assignments of unsubstituted cyclobutene.$^{2}$ The ring puckering frequency of $264 cm-^{1}$ for 1-fluorocyclobutene will be compared with values for related cyclobutenes.