The Raman spectrum of liquid and solid AlCl3·NH3

The Raman spectra (inclusive of polarization measurements) of liquid and solid AlCl3. NH3 have been taken. An assignment of frequency shifts to vibrations of AlCl3. NH3 (symmetry C3v ) ‐ somewhat different from that assumed by Goubeau and Siebert ‐ has been given. Force constants have been calculated from these frequencies with Wagner's formulae. To the symmetrical stretching vibration of N‐H in Cl3Al. NH3 a frequency has been assigned by us (liquid 3247 cm−1; solid 3259 cm−1), which is higher than the one assumed by Goubeau and Siebert (2900 cm−1). Our value shows a rather small difference from the corresponding one in free NH3.