Observation de transitions de phase dans les dérivés dihalogénés du benzène par spectroscopie infrarouge lointain et diffusion Raman

Abstract

Far infrared absorption and Raman spectra were recorded for ortho- and meta-disubstituted benzene ClC6H4Cl, ClC6H4Br, and BrC6H4Br from 15 to 250 cm−1 at different temperatures (80–300 K). From spectroscopic evidence, one phase transition is found for both the o- (200 K) and the m-dichlorobenzene (220 K), and two for the o-chlorobromobenzene (185 and 222 K).