Complete Solvation Dynamics of Coumarin 153 in Tetraalkylammonium Bromide-Based Deep Eutectic Solvents
| Autor: | Anunay Samanta, Sneha Paul, Sk Saddam Hossain |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Materials science 010304 chemical physics Solvation 010402 general chemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Solvent Viscosity symbols.namesake chemistry.chemical_compound Solvation shell chemistry Bromide Chemical physics Stokes shift 0103 physical sciences Materials Chemistry symbols Physical and Theoretical Chemistry Alkyl Eutectic system |
| Zdroj: | The Journal of Physical Chemistry B. 124:2473-2481 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/acs.jpcb.0c00594 |
| Popis: | Deep eutectic solvents (DESs) are novel environment-friendly media for a variety of applications. In order to obtain insight into the structure and dynamics of some less-explored DESs comprising ethylene glycol and tetraalkylammonium bromide salts with variable alkyl chain length, we have captured complete dynamics occurring in these solvents in a timescale of few femtoseconds to several nanoseconds by monitoring the time-dependent fluorescence Stokes shift of coumarin 153 employing a combination of time-correlated single-photon counting and fluorescence upconversion techniques. The solvent response function constructed from the measured data reveals a sub-picosecond component (∼0.8 ps, 20-35%) in addition to a slow component (180-475 ps) with a distribution of relaxation time. The slow time component is found to be strongly dependent on the viscosity of the medium, indicating that it arises from the diffusive motions of the solvent constituents into and out of the solvation shell, whereas the ultrafast time component, which is nearly independent of the solvent viscosity, arises from fast local motions of the constituents in the immediate vicinity of the solute molecule. |
| Databáze: | OpenAIRE |
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