| Full text | |
| Author(s): |
Ribeiro, Mauro C. C.
Total Authors: 1
|
| Document type: | Journal article |
| Source: | JOURNAL OF MOLECULAR LIQUIDS; v. 310, JUL 15 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
This work discusses the remarkable differences in the mid- and far-infrared regions of the spectrum of the ionic liquid 1-ethyl-3-methylimidazolium hydrogen sulfate, {[}C(2)C(1)im]{[}HSO4], in comparison to ionic liquids based on other anions. The infrared spectrum unveils the occurrence of anion-anion hydrogen bond in {[}C(2)C(1)im]{[}HSO4]. The band related to the anion O-H stretching mode,.(OH), covers a large frequency range (2000-3400 cm(-1)) and exhibits the spectral pattern of strongly hydrogen bonded systems. The far-infrared (FIR) spectrumof {[}C(2)C(1)im]{[}HSO4] also exhibits the signature of the anion-anion interaction, that is, the stretching mode of the hydrogen bond,.(O.O), at similar to 170 cm(-1). Hydrogen bond between {[}HSO4](-) anions also occurs in ionic liquids containing imidazolium cation with longer alkyl chain ({[}C(4)C(1)im]+) or tetraalkylammonium cation. The vibrational frequencies of nu(OH) and nu(O center dot center dot center dot O) modes satisfy empirical correlations that characterize the anionanion interaction in {[}C(2)C(1)Im]{[}HSO4] as a strong hydrogen bond. (C) 2020 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 16/21070-5 - Vibrational spectroscopy with spatial resolution |
| Grantee: | Mauro Carlos Costa Ribeiro |
| Support Opportunities: | Research Projects - Thematic Grants |