Spectrophotometric Studies of Iodine Complexes in an Aluminum Chloride - Butylpyridinium Chloride Ionic Liquid.

摘要

Iodine, iodine chloride, tetraethylammonium iodide and tetraethylammonium triiodide solutions in aluminum chloride - N-(1-butyl)pyridinium chloride ambient temperature ionic liquids have been studied by u.v. - visible spectrophotometry. The different oxidation states of iodine show a distinct dependence on the solvent acidity. Iodine(+1) exists in the form of ICl in acidic melts and in the form of ICl2 in basic AlCl3-BuPyCl mixtures. Molecular iodine does not form strong complexes in acidic or neutral solutions. Triiodide ion is stable in neutral butylpyridinium tetrachloroaluminate, but not in acidic melts.