Spectroscopic studies have been performed in the UV-visible region on methylene chloride and cyclohexane solutions containing iodine and 12-crown-4,15-crown-5, and 18-crown-6. In cyclohexane these crown ethers form 1:1 molecular complexes with iodine with corresponding equilibrium constants which are identical within experimental error, but are a factor of 2-3 times larger than the literature values for mono-and diethers. When methylene chloride is the solvent, the triiodide ion is an important species, in solutions containing iodine and 18-crown-6.
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