A far infrared study of benzene-fluorinated benzene binary mixtures

Abstract The experimental FIR spectra of liquid equimolar binary mixtures formed with benzene, 1,3,5-trifluorobenzene and hexafluorobenzene have been compared with the spectra calculated as a weighted sum of the corresponding spectra of the neat liquids. In contrast to the other binary mixtures, for C 6 H 6 /C 6 F 6 a marked deviation from the additivity is observed. These results are interpreted as providing evidence for the existence of a different and stronger local ordering which might be ascribed as the “signature” of a very short-lived “complex”.