Fluorescence response of a dipolar organic solute in a dicationic ionic liquid (IL): is the behavior of dicationic IL different from that of usual monocationic IL?

@article{Sahu2014FluorescenceRO,
  title={Fluorescence response of a dipolar organic solute in a dicationic ionic liquid (IL): is the behavior of dicationic IL different from that of usual monocationic IL?},
  author={Prabhat Kumar Sahu and Sudhir Kumar Das and Moloy Sarkar},
  journal={Physical chemistry chemical physics : PCCP},
  year={2014},
  volume={16 25},
  pages={
          12918-28
        }
}
The solvation and rotational relaxation dynamics of coumarin 153 have been investigated in a dicationic ionic liquid (IL), 1,6-bis-(3-methylimidazolium-1-yl)hexane bis-(trifluoromethylsulfonyl)amide ([C6(MIm)2][NTf2]2), for the first time to provide a comprehensive and a quantitative understanding of the nature of the ionic fluid and its influence on the average solvation and rotational relaxation time. On several occasions, the photophysical data obtained in the present dicationic IL have also… 
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Differences in the behavior of dicationic and monocationic ionic liquids as revealed by time resolved-fluorescence, NMR and fluorescence correlation spectroscopy.
TLDR
The outcomes of all of these studies have demonstrated that the behavior of DILs is quite different to that of the usual MILs, and is more micro-heterogeneous in nature than MIL.
Understanding Structure-Property Correlation in Monocationic and Dicationic Ionic Liquids through Combined Fluorescence and Pulsed-Field Gradient (PFG) and Relaxation NMR Experiments.
TLDR
Analysis of the rotational relaxation dynamics data by the Stokes-Einstein-Debye hydrodynamic theory unveils distinctive features of solute-solvent interaction in [C3MIm][NTf2] and [C6(MIm)2]2.
Rotational dynamics of imidazolium-based ionic liquids: do the nature of the anion and the length of the alkyl chain influence the dynamics?
TLDR
The ability of the ionic liquids with longer alkyl chains to form the organized structure appears to be responsible for the observed behavior considering the fact that significant deviations from linearity have been noticed in the τr versus η/T plots for strongly associating anions [BF4] and [PF6], especially at ambient temperatures.
Rotational diffusion of organic solutes in 1-methyl-3-octylimidazolium tetrafluoroborate-diethylene glycol mixtures: influence of organic solvent on the organized structure of the ionic liquid.
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Observations have been rationalized by taking into consideration the organized structure of the ionic liquid, which gradually becomes homogeneous at the microscopic level with the addition of the organic solvent, and their rotational diffusion follows the predictions of the SED hydrodynamic theory.
Rotational diffusion of nondipolar and charged solutes in alkyl-substituted imidazolium triflimides: effect of C2 methylation on solute rotation.
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The intriguing result of this study is that the reorientation times of R110 in [BMMIM][Tf2N] deviate significantly from the predictions of stick hydrodynamics, especially at ambient temperatures.
Rotational dynamics of carbon dioxide in ionic liquids
Study of imidazolium dicationic ionic liquids by Raman and FTIR spectroscopies: The effect of the nature of the anion
Probing the interactions of structurally similar but chemically distinguishable organic solutes with 1-ethyl-3-methylimidazolium alkyl sulfate (alkyl = ethyl, hexyl and octyl) ionic liquids through fluorescence, NMR and fluorescence correlation spectroscopy (FCS) studies.
TLDR
Two chemically distinguishable solutes with structural similarity in their fluorophore unit are employed so that the difference in the rotational behavior of the solutes, if any, can be correlated with the solute-solvent interactions, and not with other factors like the size of thesolutes etc.
Probing the Aggregation Behavior of Neat Imidazolium-Based Alkyl Sulfate (Alkyl = Ethyl, Butyl, Hexyl, and Octyl) Ionic Liquids through Time Resolved Florescence Anisotropy and NMR and Fluorescence Correlation Spectroscopy Study.
TLDR
Interestingly, experimentally measured rotational relaxation times (τr) for ethyl, butyl, hexyl and octyl systems are measured to be 2.32 times higher than the estimated values, which indicates that the emitting species is not the monomeric imidazolium moiety rather an associated species, and volume of the rotating fluorescing species decreases even though the length of the alkyl moiety on the anions is increased.
Understanding the Behavior of Monocationic and Dicationic Room Temperature Ionic Liquids through Resonance Energy Transfer (RET) Studies.
TLDR
The result of the present study delineates that the length of the alkyl chain length on the cation is not the sole factor contributing to the RET outcomes for Dils and MILs but the local structure of DILs also contribute significantly to the same.
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