Journal article
Phase Transitions of the Ionic Liquid [C(2)C(1)im][NTf2] under High Pressure: A Synchrotron X-ray Diffraction and Raman Microscopy Study
Crystal growth & design, v 17(10), pp 5384-5392
01 Oct 2017
Abstract
The interplay between crystallization and glass transition in the archetypal ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide, [C(2)C(1)im][NTf2], has been studied as a function of pressure up to ca. 12 GPa. Besides heterogeneous crystal nucleation, homogeneous nucleation in the sample inside the diamond anvil cell was also observed depending on compression/decompression rate. Amorphization of the crystal and glass formation under pressure has been followed by synchrotron X-ray diffraction. The characteristic Raman bands of the [NTf2](-) anion provide a microscopic probe of the different phases. The crystalline phase is composed of the [NTf2](-) cisoid conformer, but moisture implies formation of crystal with the transoid conformer. Raman spectra show that crystalline phases might become microscopically heterogeneous because of [NTf2](-) conformational disorder. Raman mapping reveals the order disorder evolution from crystal to glass. Crystals of [C(2)C(1)im][NTf2] formed under high pressure and room temperature are similar to previously reported low temperature and atmospheric pressure crystals. Thus, it is concluded that density is the main factor controlling crystallization and glass formation under high pressure of [NTf2](-) based ionic liquids due to hindrance of efficient ion packing. The results highlight that ionic liquids are good models to understand fundamental questions related to the mechanism of crystallization and glass transition.
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Details
- Title
- Phase Transitions of the Ionic Liquid [C(2)C(1)im][NTf2] under High Pressure: A Synchrotron X-ray Diffraction and Raman Microscopy Study
- Creators
- Luiz F. O. Faria - Universidade de São PauloThamires A. Lima - Universidade de São PauloMauro C. C. Ribeiro - Universidade de São Paulo
- Publication Details
- Crystal growth & design, v 17(10), pp 5384-5392
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 9
- Grant note
- 2015/05803-0; 2014/15049-8; 2012/13119-3 / FAPESP; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) CNPq; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000412718100044
- Scopus ID
- 2-s2.0-85042481840
- Other Identifier
- 991019298995704721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Multidisciplinary
- Crystallography
- Materials Science, Multidisciplinary