Vibrational spectra of fluorinated aromatics. X. p-fluorochloro-, p-fluorobromo-, and p-fluoroiodobenzene

The infrared absorption spectra of liquid p-fluorochloro-, p-fluorobromo-, and p-fluoroiodobenzene, and the stronger bands of the first two compounds in the gaseous state, have been obtained in the region 2-38μ with NaCl and CsBr prisms. The Raman spectra of the compounds in the liquid state have been photographed with a 3-prism glass spectrograph of linear dispersion 15 A/mm at 4358 A, and depolarization ratios have been measured for the stronger Raman bands of p-fluorochloro- and p-fluorobromobenzene. Complete assignments of the fundamental vibrational frequencies have been made, and the spectra are interpreted in detail