Vibrational Spectra and Structure of Four‐Membered Ring Molecules. IV. 2‐Bromocyclobutanone and 2‐Bromo‐2,4,4‐trideuterocyclobutanone

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Abstract
The infrared and Raman spectra of 2‐bromocyclobutanone and 2‐bromo‐2,4,4‐trideuterocyclobutanone in the liquid state have been recorded. The far‐infrared spectra of both compounds have also been recorded from 33–300 cm−1 in both the vapor and liquid states. The assignment of the 27 normal vibrations is given. The interesting ring‐puckering vibration in 2‐bromocyclobutanone has been observed at 153 cm−1 in the Raman spectrum and at 141.5 cm−1 in the infrared spectrum of the vapor. For the deuterium compound the corresponding absorption bands have been observed in the Raman and infrared spectra at 152 and 141 cm−1, respectively. The data indicate that the potential function governing this vibration is only slightly anharmonic. No evidence has been found for the conformers previously reported for this molecule.