The effect of structural heterogeneity upon the microviscosity of ionic liquids

Ryan Clark, Mohd A. Nawawi, Ana Dobre, David Pugh, Qingshan Liu, Aleksandar P. Ivanov, Andrew J.P. White, Joshua B. Edel, Marina K. Kuimova, Alastair J.S. McIntosh, Tom Welton*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

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. This journal is

Original languageEnglish
Pages (from-to)6121-6133
Number of pages13
JournalChemical Science
Volume11
Issue number24
DOIs
Publication statusPublished - 28 Jun 2020

Fingerprint

Dive into the research topics of 'The effect of structural heterogeneity upon the microviscosity of ionic liquids'. Together they form a unique fingerprint.

Cite this