Figure 5.

IR spectra in transmittance of the (C₂H₃-Cl⁺-C₂H₃) {Cl₁₁⁻} salt (red) and its deuterated analog (blue). Asterisks indicate bands of the {Cl₁₁⁻} anion (two bands of CH stretching of the anion of variable intensity are observed due to the partial involvement of the CH group in H bonding). For a better examination of the bands of CH stretching vibrations, the difference between the protio and deutero spectra is shown (dashed black curve). The intensities of both spectra are reduced to unit anion intensity.