Abstract
The infra-red, visible and ultra-violet spectra of solutions of DMSO and iodine in carbon tetrachloride were studied at 20°C and the ratio of DMSO to iodine concentrations was changed from 2 to 20, 00. The results confirm the existence of a molecular complex DMSO. I 2. The reversible formation of the tri-iodide ion is related to a change of polarity in the medium when a relatively large amount of DMSO is present, due to the high dielectric constant of the latter as compared to carbon tetrachloride, which induces the ionization of the complex.
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