Probing the local polarity of alkylammonium formate ionic liquids and their mixtures with water by using a carbonyl carotenoid

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Maria EkimovaKawon Oum

Abstract

Ultrafast transient absorption experiments have been carried out to determine the local polarity of three alkylammonium formate (AAF) protic ionic liquids (PILs), methlyammonium formate (MAF), ethylammonium formate (EAF), and n-butylammonium formate (BAF), by using 12'-apo-β-carotenoic-12'-acid (12'CA) as a molecular probe. MAF is more polar than methanol; EAF and BAF have polarities similar to ethanol and n-butanol, respectively. In general, the AAF PILs follow rather closely the correlation between the S(1) /intramolecular charge-transfer (ICT) state lifetime and the polarity parameter Δf, which was previously established in organic solvents. This is in contrast to earlier results for the 12'CA probe in imidazolium-based ILs, in which the local polarity determined by the probe was much larger than that for dipolar organic solvents with the same dielectric constant. The systematic variation of the composition of EAF/water mixtures shows no indication of significant deviations from the local to the bulk composition. We also characterized the photophysical properties of the deprotonated form of the 12'CA probe. It exhibits a structured S(0)→S(2) absorption spectrum, which is blueshifted relative to neutral 12'CA. The lifetime of...Continue Reading

References

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Apr 12, 2008·Physical Chemistry Chemical Physics : PCCP·Sebastian StalkeKawon Oum
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Oct 13, 2011·Physical Chemistry Chemical Physics : PCCP·Peter W LohseKawon Oum

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Citations

Oct 2, 2015·Chemical Reviews·Tamar L Greaves, Calum J Drummond
Nov 8, 2014·Chembiochem : a European Journal of Chemical Biology·Pascal HeimerDiana Imhof
Jan 14, 2017·The Journal of Physical Chemistry. B·Joshua E S J ReidSeishi Shimizu
Oct 12, 2018·The Journal of Chemical Physics·Andreas Nazet, Richard Buchner
Feb 11, 2021·ChemistryOpen·Julia LeierAndreas-Neil Unterreiner
Jun 19, 2021·The Journal of Physical Chemistry. B·Aritri Biswas, Bhabani S Mallik
Nov 2, 2017·The Journal of Physical Chemistry. a·Mirko ScholzKawon Oum

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