High throughput study of ionic liquids in controlled environments with FTIR spectroscopic imaging
| Autor: | Tom Welton, K. L. Andrew Chan, Anton S. Shalygin, Oleg N. Martyanov, Sergei G. Kazarian |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science Tetrafluoroborate 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics C4mim 01 natural sciences Toluene Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry.chemical_compound Perchlorate chemistry Hexafluorophosphate Ionic liquid Materials Chemistry Physical chemistry Physical and Theoretical Chemistry 0210 nano-technology Trifluoromethanesulfonate Spectroscopy Alkyl |
| Zdroj: | Journal of Molecular Liquids. 337:116412 |
| ISSN: | 0167-7322 |
| Popis: | In situ characterisation of ionic liquids under a controlled environment has been performed in a high throughput manner using macro ATR-FTIR spectroscopic imaging. 14 different ionic liquids with cations 1-butyl-3-methylimidazolium ([C4mim]), 1-butyl-2,3-dimethylimidazolium ([C4mmim]) and 1-butyl-3-methylpyrrolidinium ([C4C1pyrr]) and anions hexafluorophosphate ([PF6]), tetrafluoroborate ([BF4]), bis(trifluoromethylsulfonyl)imide ([NTf2]), perchlorate ([ClO4]), trifluoromethanesulfonate ([CF3SO3]), nitrate ([NO3]), methanesulfonate ([CH3SO3]) and trifluoroacetate ([TA]) were studied. The ionic liquids were deposited onto the measuring surface of the ATR crystal in the corresponding accessory hosted in the FTIR imaging system. Then these samples were exposed to a controlled environment of toluene and water vapour and spectra acquired simultaneously. Changing the structure of the cation head group from [C4mim] to [C4mmim] or [C4C1pyrr] only had a small effect on the toluene absorption while increasing the length of the alkyl chain of the cation (e.g. [C10mim]) has shown a significant increase in toluene absorption. The ionic liquids with the anion [NTf2] were found to absorb the highest amount of toluene followed by [CF3SO3], then [PF6], [ClO4], [NO3] and [TA], and the lowest amount of toluene was absorbed in ionic liquids with [BF4] or [CH3SO3] anions. The amount of water absorbed increases in the order: [C4mim][CH3SO3] > [C4mim][TA] > [C4mim][NO3] > [C4mim][CF3SO3] > [C4mim][ClO4] ~ [C4mim][BF4] ~ [C4mmim][BF4] > [C10mim][BF4] > [C4mim][PF6] ~ [C4mmim][PF6] > [C4mim][NTf2] ~ [C4mmim][NTf2] ~ [C4C1pyrr][NTf2]. This work has demonstrated that spectroscopic imaging provides a platform for the simultaneous screening of multiple ionic liquids in situ, when under controlled environments. |
| Databáze: | OpenAIRE |
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