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Issue 24, 2020
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The effect of structural heterogeneity upon the microviscosity of ionic liquids

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Abstract

The behaviour of two molecular rotors, one charged – 3,3′-diethylthiacarbocyanine iodide (Cy3) and one neutral – 8-[4-decyloxyphenyl]-4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY-C10), have been studied in various ionic liquids. The fluorescent decay lifetime has been used to elucidate the structure of the immediate region around the rotor. The neutral BODIPY-C10 was found to prefer the non-polar alkyl chain environment, leading to two trends in the lifetime of the dye: one when it was fully partitioned into the non-polar domain, and one when it also sampled polar moieties. The positively charged Cy3 dye showed a complex relationship between the bulk viscosity of the ionic liquid and lifetime of the molecular rotor. This was attributed to a combination of polarity related spectral changes, changes in anion cages around the dye, and temperature dependent fluorescent lifetimes alongside the dependence of the rotor upon the viscosity.

Graphical abstract: The effect of structural heterogeneity upon the microviscosity of ionic liquids

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Article information


Submitted
08 Apr 2020
Accepted
26 May 2020
First published
27 May 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 6121-6133
Article type
Edge Article

The effect of structural heterogeneity upon the microviscosity of ionic liquids

R. Clark, M. A. Nawawi, A. Dobre, D. Pugh, Q. Liu, A. P. Ivanov, A. J. P. White, J. B. Edel, M. K. Kuimova, A. J. S. McIntosh and T. Welton, Chem. Sci., 2020, 11, 6121
DOI: 10.1039/D0SC02009E

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