A FAR-INFRARED STUDY OF BENZENE FLUORINATED BENZENE BINARY-MIXTURES

The experimental FIR spectra of liquid equimolar binary mixtures forme d with benzene, 1,3,5-trifluorobenzene and hexafluorobenzene have been compared with the spectra calculated as a weighted sum of the corresp onding spectra of the neat liquids. In contrast to the other binary mi xtures, for C6H6/C6F6 a marked deviation from the additivity is observ ed. These results are interpreted as providing evidence for the existe nce of a different and stronger local ordering which might be ascribed as the ''signature'' of a very short-lived ''complex''.