Probing the Interaction of 1-Ethyl-3-methylimidazolium Ethyl Sulfate ([Emim][EtSO₄]) with Alcohols and Water by Solvent and Rotational Relaxation

Abstract

The effect of the addition of cosolvents in the room temperature ionic liquid (RTIL) 1-ethyl-3-methylimidazolium ethyl sulfate ([Emim][EtSO(4)]) was probed by the solvent and rotational relaxation studies of coumarin 153 in neat ionic liquid [Emim][EtSO(4)] and [Emim][EtSO(4)]-cosolvent mixtures by using steady-state and time-resolved fluorescence spectroscopy. With gradual addition of cosolvents in the RTIL, both the average solvation time and rotational relaxation times gradually decrease. Addition of cosolvents in the IL decreases the viscosity of the medium. We have optimized the geometry of [Emim][EtSO(4)] and [Emim][EtSO(4)]-cosolvent mixtures by using quantum chemical calculations using density functional theory methods, which show the formation of hydrogen bond between cosolvents with [Emim][EtSO(4)]. With addition of the same amount of alcohols in neat [Emim][EtSO(4)], the rotational relaxation time decreases more compared to the addition of the same amount of water.

Linking Diffusion–Viscosity Decoupling and Jump Dynamics in a Hydroxyl‐Functionalized Ionic Liquid: Realization of Microheterogeneous Nature of the Medium

“…does not become as slow as is expected from the bulk viscosity of the same IL. [46] Slopes of 0. This is perhaps due to the specific solute-solvent hydrogen-bonding interaction in case of the hydroxyl-substituted IL.…”

Efficient oxidation of polycyclic aromatic hydrocarbons with H2O2 catalyzed by 5,10,15-triarylcorrolatoiron (IV) chloride in ionic liquids

“…The ease of oxidation of 1 was found to increase in the line of CH 2 Cl 2 b ACNb methanol. This remarkable effect could be correlated to the polarity of the solvent which governs the interionic interaction energy of ILs and solvation dynamics [15,16].…”

“…The ethyl acetate layer was concentrated under reduced pressure and all the components were separated by preparative TLC. The yield of different oxidized products was analyzed by HPLC in methanol/ water Catalysis Communications 29 (2012) [15][16][17][18][19][20] (1:1, v/v) as solvent, by comparing the retention time with authentic samples. All the oxidized products were characterized by 1 H NMR, IR and MS spectroscopic techniques which gave the satisfactory results with the reported data.…”

Investigations of absorption and emission spectral data in mixed liquid media. A short review of recent literature

“…[38][39][40][41][42]. Recently, S. Daschakraborty and R. Biswas [43] developed an approximate semimolecular theory to investigate the composition dependence of Stokes shift dynamics of a fluorescent dye molecules dissolved in binary mixtures of an ionic liquid with different polar solvents (water, acetonitrile), at various mole fractions.…”