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Issue 47, 2016
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Polyiodides in room-temperature ionic liquids

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Abstract

Polyiodides, Im, were formed in room-temperature ionic liquids (RTILs). The RTILs were N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium iodide, [DEME][I], and 1-alkyl-3-methylimidazolium iodide, [Cnmim][I] (n = 1, 2, 3, 4, 6, and 12). In [Cnmim][Im], prepeak and intensity modulation of X-ray diffraction were caused by polyiodides. Above m = 4, polyiodide-mediated local structures were formed, although little alkyl side-chain length, n, dependence was seen in the X-ray diffraction patterns. The viscosity of the mixtures was measured as a function of m to obtain their dynamic properties. The m tendencies of the viscosity and density changed at around m = 4 when fixing n = 4. By 127I-NMR, the local environments of only polyiodides were extracted by changing n, m, and the temperature. Doublet/triplet peak splitting of pure [Cnmim][I] (n = 3, 4, and 6) occurred at low temperature. In [Cnmim][Im] (n = 2 and 4), the effect of polyiodides was clarified from the chemical shifts and peak splitting in the NMR spectra. The experimental results support a Grotthuss-type exchange mechanism of iodide between polyiodides.

Graphical abstract: Polyiodides in room-temperature ionic liquids

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Publication details

The article was received on 06 Oct 2016, accepted on 01 Nov 2016 and first published on 02 Nov 2016


Article type: Paper
DOI: 10.1039/C6CP06846D
Citation: Phys. Chem. Chem. Phys., 2016,18, 32337-32344

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    Polyiodides in room-temperature ionic liquids

    H. Abe, M. Aono, T. Kiyotani and S. Tsuzuki, Phys. Chem. Chem. Phys., 2016, 18, 32337
    DOI: 10.1039/C6CP06846D

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