The microheterogeneous structure of ionic liquid mixtures with organic solvent determined by a cyanine-dye fluorescent probe
[Display omitted] ► A cyanine-dye probe was used in studying mixtures of DMSO with ionic liquids. ► A significant distinction between the mixtures was found in the fluorescence-decay. ► The existence of spatial heterogeneities in ionic liquid/DMSO mixtures was proposed. The photophysics of 3,3′-diet...
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Published in | Chemical physics letters Vol. 551; pp. 111 - 114 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.11.2012
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | [Display omitted]
► A cyanine-dye probe was used in studying mixtures of DMSO with ionic liquids. ► A significant distinction between the mixtures was found in the fluorescence-decay. ► The existence of spatial heterogeneities in ionic liquid/DMSO mixtures was proposed.
The photophysics of 3,3′-diethylthiacarbocyanine iodide (DTCI), as a fluorescence probe, in liquid mixtures of dimethyl sulfoxide (DMSO) with either trimethyl(butyl)ammonium bis((trifluoromethyl)sulfonyl)imide ([N(4)111] [Tf2N]) or 1-butyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide ([bmim] [Tf2N]) was studied by means of steady-state and time resolved fluorescence spectroscopy. The DTCI fluorescence decay was found to be double-exponential in mixtures with [N(4)111] [Tf2N] for DMSO volume fractions less than ca. 0.6 while that is single-exponential in mixtures with [bmim] [Tf2N] under the same conditions. These findings are explained in terms of the Hildebrand solubility model by assuming the existence of coursed-grained spatial micro-heterogeneities in ammonium-based ionic liquid/DMSO mixtures. |
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ISSN: | 0009-2614 1873-4448 |
DOI: | 10.1016/j.cplett.2012.09.024 |