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Issue 43, 2020
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Post-synthetic modification of ionic liquids using ligand-exchange and redox coordination chemistry

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Abstract

Ionic liquids (ILs) derive their useful properties from molecularly tunable compositions, but methods to diversify anion identities and probe ion speciation remain limited. Here, we demonstrate post-synthetic modification of perhalometallate anions to achieve ionic liquid-to-ionic liquid transformations. Rheological measurements of the metal-containing ILs indicate that minor alterations to anion coordination spheres induce considerable changes to IL viscosities. UV-vis spectra confirm the purities for most ILs, while revealing a surprising cation dependence of perchlorovanadate speciation and supramolecular structure. The intermolecular interactions studied here span a wide range from dispersion to covalent bonding, permitting their impact on IL viscosity to be decoupled and quantified. Together, synthetic strategies from coordination chemistry paired with conventional UV-vis spectroscopy provide a powerful tool for expanding IL compositions and investigating fundamental nanoscale behavior.

Graphical abstract: Post-synthetic modification of ionic liquids using ligand-exchange and redox coordination chemistry

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Supplementary files

Article information


Submitted
23 Jun 2020
Accepted
19 Oct 2020
First published
21 Oct 2020

J. Mater. Chem. A, 2020,8, 22674-22685
Article type
Paper

Post-synthetic modification of ionic liquids using ligand-exchange and redox coordination chemistry

M. A. LeRoy, A. M. Mroz, J. L. Mancuso, A. Miller, A. Van Cleve, C. Check, H. Heinz, C. H. Hendon and C. K. Brozek, J. Mater. Chem. A, 2020, 8, 22674
DOI: 10.1039/D0TA06195F

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