Raman spectroscopic study of PCl₅‐AlCl₃ melts

Raman spectra have been recorded from PCl 5 ‐AlCl 3 melts containing 30,50,63.7,70,80 and 90 mol% AlCl 3 , respectively. Raman shifts were identified from the species: PCl 5 , PCl 4 , + AlCl 4 , − AlCl 7 − and Al 2 Cl 6 . A higher Al x Cl y −z complex exists in melts with more than 70 mol% AlCl 3 and is characterized by Raman shifts of 100, 297 and 395 cm −1 . The relative molar scattering intensities of the strongest MCl stretching vibrations of the melt species have been estimated relative to the intensity of the total symmetric stretching vibration of tetrahedral PCl 4 + .