Local structures of ionic liquids in the presence of gold under high pressures
The interactions between ionic liquid ([EMI][TFS]) and gold surfaces have been investigated via the application of pressures up to ca. 2 GPa. Comparing the spectral features of [EMI][TFS]/gold with those of pure [EMI][TFS], no appreciable changes of C-H bands in the presence of gold powders were obs...
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doaj-57305a44699d45cabe9895fb5f7e1d382020-11-25T02:44:55ZengAIP Publishing LLCAIP Advances2158-32262013-03-013303214703214710.1063/1.4799740Local structures of ionic liquids in the presence of gold under high pressuresHai-Chou ChangTzu-Chieh HungHsing-Sheng WangTsai-Yi ChenThe interactions between ionic liquid ([EMI][TFS]) and gold surfaces have been investigated via the application of pressures up to ca. 2 GPa. Comparing the spectral features of [EMI][TFS]/gold with those of pure [EMI][TFS], no appreciable changes of C-H bands in the presence of gold powders were observed under ambient pressure. Nevertheless, the imidazolium C-H bands display red shifts in frequency as the [EMI][TFS] / Au mixture was compressed to the pressure above 1.4 GPa and a new alkyl C-H band at ca. 3016 cm−1 was also revealed. These spectral changes, being related to the addition of gold powders and pressure elevation, should be attributed to the local structural changes of C-H groups caused by pressure-enhanced interfacial interactions between [EMI][TFS] and Au. Gold powders tend to induce the changes in hydrogen bonding structures of imidazolium C2-H group under high pressures. The pressure-dependent spectral features in the asymmetric SO3 stretching region display band-narrowing and minor local structural changes induced by the presence of gold particles under high pressures. These observations suggest that Au powders perturb structural equilibrium of C-H groups of cations under high pressures. http://link.aip.org/link/doi/10.1063/1.4799740 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hai-Chou Chang Tzu-Chieh Hung Hsing-Sheng Wang Tsai-Yi Chen |
spellingShingle |
Hai-Chou Chang Tzu-Chieh Hung Hsing-Sheng Wang Tsai-Yi Chen Local structures of ionic liquids in the presence of gold under high pressures AIP Advances |
author_facet |
Hai-Chou Chang Tzu-Chieh Hung Hsing-Sheng Wang Tsai-Yi Chen |
author_sort |
Hai-Chou Chang |
title |
Local structures of ionic liquids in the presence of gold under high pressures |
title_short |
Local structures of ionic liquids in the presence of gold under high pressures |
title_full |
Local structures of ionic liquids in the presence of gold under high pressures |
title_fullStr |
Local structures of ionic liquids in the presence of gold under high pressures |
title_full_unstemmed |
Local structures of ionic liquids in the presence of gold under high pressures |
title_sort |
local structures of ionic liquids in the presence of gold under high pressures |
publisher |
AIP Publishing LLC |
series |
AIP Advances |
issn |
2158-3226 |
publishDate |
2013-03-01 |
description |
The interactions between ionic liquid ([EMI][TFS]) and gold surfaces have been investigated via the application of pressures up to ca. 2 GPa. Comparing the spectral features of [EMI][TFS]/gold with those of pure [EMI][TFS], no appreciable changes of C-H bands in the presence of gold powders were observed under ambient pressure. Nevertheless, the imidazolium C-H bands display red shifts in frequency as the [EMI][TFS] / Au mixture was compressed to the pressure above 1.4 GPa and a new alkyl C-H band at ca. 3016 cm−1 was also revealed. These spectral changes, being related to the addition of gold powders and pressure elevation, should be attributed to the local structural changes of C-H groups caused by pressure-enhanced interfacial interactions between [EMI][TFS] and Au. Gold powders tend to induce the changes in hydrogen bonding structures of imidazolium C2-H group under high pressures. The pressure-dependent spectral features in the asymmetric SO3 stretching region display band-narrowing and minor local structural changes induced by the presence of gold particles under high pressures. These observations suggest that Au powders perturb structural equilibrium of C-H groups of cations under high pressures. |
url |
http://link.aip.org/link/doi/10.1063/1.4799740 |
work_keys_str_mv |
AT haichouchang localstructuresofionicliquidsinthepresenceofgoldunderhighpressures AT tzuchiehhung localstructuresofionicliquidsinthepresenceofgoldunderhighpressures AT hsingshengwang localstructuresofionicliquidsinthepresenceofgoldunderhighpressures AT tsaiyichen localstructuresofionicliquidsinthepresenceofgoldunderhighpressures |
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