Pulse Radiolysis and Computational Studies on a Pyrrolidinium Dicyanamide Ionic Liquid: Detection of the Dimer Radical Anion
| Autor: | Dilip K. Maity, James F. Wishart, Soumyakanti Adhikari, Surajdevprakash B. Dhiman, Rahul Kumar, Laboni Das |
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| Rok vydání: | 2018 |
| Předmět: |
Absorption spectroscopy
Radical 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Solvated electron Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Ionic liquid Ultrafast laser spectroscopy Radiolysis Physical and Theoretical Chemistry Absorption (chemistry) 0210 nano-technology Dicyanamide |
| Zdroj: | The Journal of Physical Chemistry A. 122:3148-3155 |
| ISSN: | 1520-5215 1089-5639 |
| DOI: | 10.1021/acs.jpca.8b00978 |
| Popis: | A pulse radiolysis study on pyrrolidinium cation based ionic liquids is presented herein. Time-resolved absorption spectra for 1-methyl-1-propylpyrrolidinium dicyanamide (DCA) at 500 ns after the electron pulse show broad absorption bands at wavelengths below 440 nm and at 640 nm. In pyrrolidinium bis(trifluoromethylsulfonyl)imide (NTf2) and tris(perfluoroethyl)trifluorophosphate (FAP) ILs, the transient absorption below 440 nm is much weaker. The absorption at 500 ns, which increases with wavelength from 500 nm to beyond 800 nm, was assigned to the tail of the solvated electron NIR absorption spectrum, since it disappears in the presence of N2O. In the DCA IL, the presence of a reducing species was confirmed by the formation of pyrene radical anion. The difference in the transient species in the case of the DCA IL compared to other two ILs should be due to the anion, with cations being similar. In pseudohalide ILs such as DCA, radicals are formed by direct hole trapping by the anion (X– + h+ → X•), follo... |
| Databáze: | OpenAIRE |
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