Abstract
Abstract We report here the microwave spectra of some isotopic species and vibrational satellites of fluoroketene, CHFCO. From the 13C and 18O species we calculate rs(CC) = 131.7 pm, rs(CO) = 116.7 pm, and ∠CCO = 178.0(5)°. The following r0 parameters were also obtained: r(CH) = 108.0 pm.; r(CF) = 135.6 pm.; ∠FCC = 119.5°; ∠HCC = 122.3°; ∠CCO = 178.0° (away from F). These values of bond lengths are close to those of ketene itself but the HCF angle of 118.2° differs noticeably from the HCH angle in ketene, although it is not as small as the ∠HCF in fluoroallene (113.8°). The semirigid bender analysis of the vibrational satellites of the in-plane CCO bending motion (v7 = 1, 2, 3) gives a very shallow single-minimum potential: V = 4765τ2 + 40002τ4 cm−1 (τ in rad). The two low-frequency out-of-plane vibrations have frequencies similar to those of ketene. We estimate them to be 380 cm−1 for v9 and 600 cm−1 for v8.
Published Version
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