The Raman and infrared spectra and normal coordinate analysis for 1,2‐diiodotetrafluorobenzene

Abstract

AbstractThe Raman spectrum of 1,2‐diiodotetrafluorobenzene was recorded in the region 50–2000 cm−1 on a Jarrell‐Ash Model 25–300 double monochromator spectrometer using 5145 Å radiation from an argon‐ion laser. The depolarization ratios of the Raman lines were measured in CS2 and CHCl3 solutions. The infrared spectrum was recorded in CS2 and CHCl3 solutions in the region 180–200 cm−1 on a Perkin‐Elmer 180 spectrometer using a CsI cell. The fundamental vibrations were assigned on the basis of the frequencies and relative intensities of the bands observed in the Raman and infrared spectra and the depolarization ratios of the Raman lines. A normal coordinate analysis was also performed to check the vibrational assignments.