Abstract
Spontaneous formations of polyiodides, Im−, were observed in room-temperature ionic liquid (RTIL)-lithium salt solutions. The RTILs consisted of 1-alkyl-3-methylimidazolium iodide, [Cnmim][I] (n = 3, 4, and 6). The lithium salt used was lithium bis(fluorosulfonyl)imide, Li[FSI]. By Raman spectroscopy, the gradual increase in the peak intensities of the polyiodides at a fixed temperature in the [Cnmim][I]–Li[FSI]-ethanol mixtures was observed along with color changes of the mixtures. Because no polyiodides were observed in the [C4mim][I] − [C4mim][FSI] mixture, it was determined that the spontaneous formation of Im− without external addition of iodine was induced by the Li ion.
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