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Volume 3, Issue 2
Insights in Analytical Electrochemistry
ISSN: 2470-9867
Analytical Chemistry-Formulation 2017
August 28-30, 2017
Page 33
8
th
Annual Congress on
&
14
th
International Conference and Exhibition on
August 28-30, 2017 Brussels, Belgium
Analytical and Bioanalytical Techniques
Pharmaceutical Formulations
Anu Kadyan et al., Insights in Analytical Electrochemistry, 3:2
DOI: 10.21767/2470-9867-C1-003
Fluorescence quenching and diffusion within Li salt added ionic liquid media
Anu Kadyan
and
Siddharth Pandey
Indian Institute of Technology Delhi, India
I
n the fast-growing world with the ever-increasing need for alternative solvents, ionic liquids are being explored widely in
almost all areas of chemistry. Ionic liquids are room-temperaturemolten salts, composed of ions with notable physicochemical
properties, such as, good thermal stability, high solubility, negligible vapor pressure, and non-flammability, among others.
In the current energy scenario, lithium-ion batteries have proven to be a promising choice for mobile applications. But to
expand its applications to large-scale, we have to cope-up with some of the limitations. Thermal stability is a major issue in the
currently used electrolytes, in lithium ion batteries. While the organic solvents had their own limitations, ionic liquids, because
of their desirable properties, have drawn much attention from researchers as alternative electrolytes for lithium-ion batteries.
To further develop and improve this new alternative class of (ionic liquid + Li salt) electrolyte system for industrial and
commercial purpose, knowledge of diffusion within such systems is of utmost importance. We present a detailed investigation
of fluorescence quenching of a model solute pyrene by an electron/charge acceptor quenching agent nitromethane dissolved
in [1-ethyl-3-methylimidazolium bis(trifluoromethyl sulfonyl)imide ([emim][Tf
2
N]) + lithium bis(trifluoromethyl sulfonyl)
imide (LiTf
2
N)] mixtures in the temperature range (298.15 to 358.15 )K. Various equilibrium quenching constants as well
as bimolecular quenching rate constants are obtained and related to the diffusion behavior within ([emim][Tf
2
N] + LiTf
2
N)
system. The result is correlated with the results from fluorescence correlation spectroscopy using a different probe. Details of
diffusion behavior showing versatility of (ionic liquid + Li salt) systems are established.
anu.kadyan1@gmail.com