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Dealing with supramolecular structure for ionic liquids: DOSY NMR approach

Abstract

Diffusion-ordered spectroscopy (DOSY) is arguably a powerful method for the NMR analysis of ionic liquids, since the self-diffusion coefficients for cation and anion can be measured straightforward. In this work, the dynamic-structural behaviour of imidazolium ionic liquids containing different anions has been investigated by experimental measurements of direct 1H diffusion coefficients in chloroform and water solutions. The influence of ion structure has been tested by using six ILs salts formed by the association of different cations (1-n-butyl-3-methylimidazolium, 1,2,3-trimethylimidazolium and tetra-n-butylammonium) with different anions structure (prolinate, acetate and o-trifluoromehtylobenzoate). The influence of IL concentration (from 0.01 to 0.5 mol L-1) was also evaluated for BMI∙Pro. The contact ion pairs (or aggregates) are maintained in both chloroform and water within the range of concentrations investigated. In the particular case of 1,2,3-trimethylimidazolium imidazolate (TMI·Im) containing confined water in DMSO the maintenance of the contact ion pairs depends on the water content that may even disrupt the IL supramolecular structure.

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Publication details

The article was received on 15 Nov 2018, accepted on 06 Jan 2019 and first published on 07 Jan 2019


Article type: Paper
DOI: 10.1039/C8CP07071G
Citation: Phys. Chem. Chem. Phys., 2019, Accepted Manuscript
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    Dealing with supramolecular structure for ionic liquids: DOSY NMR approach

    M. Zanattta, V. Antunes, C. F. Tormena, J. Dupont and F. P. dos Santos, Phys. Chem. Chem. Phys., 2019, Accepted Manuscript , DOI: 10.1039/C8CP07071G

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