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Probing the Microscopic Structural Organization of Neat Ionic Liquids (ILs) and Ionic Liquid- Based Gel through Resonance Energy Transfer (RET) Studies

Abstract

With an aim to understand the role of the ionic constituents of ionic liquids (ILs) on their structural organization, resonance energy transfer (RET) studies between ionic liquids (donor) and rhodamine 6G (acceptor) have been investigated. RET studies have been exploited for the present investigation due to the fact that the said process is extremely sensitive to the distance, and a change in the donor-acceptor distance due to a change in the structural organization can be probed. Basically, steady state and time-resolved fluorescence measurements have been carried out in two different set of ILs, where in one set (1-ethyl-3-methyl imidazolium alkyl sulfate) alkyl side chainlength on the anionic moiety is systematically varied and in other set variation is done on the cation (aromatic and nonaromatic). The data related to the RET events have been analyzed in light of Förster theory. A clear rise time in the fluorescence intensity decay profile of the acceptor has unequivocally established the RET process between donor and acceptor. Interestingly, the rise times and energy transfer efficiencies are also observed to vary with a variation in the alkyl chainlength as well as nature of cation. More interestingly, donor acceptor distance (RDA) is observed to increases from 35.0 Å to 47.5 Å upon increasing the anion chainlength from ethyl to octyl. However, RDA is found to decrease (40.5 Å to 34.9 Å) upon going from 1-methyl-3-butylimidazolium to 1-butyl-1-methylpyrrolidinium cation. The variation of relevant RET parameters for two set of ILs has been rationalized by considering the change in the structural organization of the respective set of ILs. Additionally, observation of RET process also in a IL-based gel system indicate the potential use of this fluorescent gel materials for future applications.

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Publication details

The article was received on 13 Jul 2017, accepted on 09 Aug 2017 and first published on 09 Aug 2017


Article type: Paper
DOI: 10.1039/C7CP04728B
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Probing the Microscopic Structural Organization of Neat Ionic Liquids (ILs) and Ionic Liquid- Based Gel through Resonance Energy Transfer (RET) Studies

    D. Majhi and M. Sarkar, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP04728B

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