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The Raman spectrum of commercial "sulfur dichloride" shows strong lines due to SCl 2  and S 2 Cl 2  and weak Cl 2  lines at 25 °C, but strong SCl 2  and SCl 4  signals at -100 °C (the latter are superimposed on the S 2 Cl 2  lines). Thus, the intense Raman effect of SCl 4  can be used to detect small amounts of chlorine in SCl 2  . Mixtures of SCl 2  and Cl 2  (1:15) yield the Raman spectrum of SCl 4  at -140 °C, while at 25 °C not trace of this compound can be detected. The spectra of SCl 4  and α-SeCl 4  are quite different, indicating different molecular and/or crystal structures, although ECl 3  + ions (E = S, Se) are present in both cases. While Se 2 Cl 2  dimerizes reversibly below -50 °C, S 2 Cl 2  neither dimerizes nor isomerizes on cooling. The S 2 Cl 2  dimer is characterized by a Raman line at 215 cm -1  the intensity of which was used to calculate an enthalpy of dimerization as of -17 kJ/mol.

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Low Temperature Raman Spectra of Dichlorosulfane (SCl 2 ), Tetrachlorosulfurane (SCl 4 ), Dichlorodisulfane (S 2 Cl 2 ) and Dichlorodiselane (Se 2 Cl 2 )