Journal article
Ultraslow Phase Transitions in an Anion-Anion Hydrogen-Bonded Ionic Liquid
The journal of physical chemistry. B, v 122(6), pp 1972-1980
15 Feb 2018
PMID: 29360380
Abstract
A Raman spectroscopy study of 1-ethyl-3-methylimidazolium hydrogen sulfate, [C(2)C(1)im][HSO4], as a function of temperature, has been performed to reveal the role played by anion-anion hydrogen bond on the phase transitions of this ionic liquid. Anion-anion hydrogen bonding implies high viscosity, good glass forming ability, and also moderate fragility of [C(2)C(1)im][HSO4] in comparison with other ionic liquids. Heating [C(2)C(1)im][HSO4] from the glassy phase results in cold crystallization at similar to 245 K. A solid-solid transition (crystal I -> crystal II) is barely discernible in calorimetric measurements at typical heating rates, but it is clearly revealed by Raman spectroscopy and X-ray diffraction. Raman spectroscopy indicates that crystal I has extended ([HSO4](-))(n) chains of hydrogen-bonded anions but crystal II has not. Raman spectra recorded at isothermal condition show the ultraslow dynamics of cold crystallization, solid-solid transition, and continuous melting of [C(2)C(1)im][HSO4]. A brief comparison is also provided between [C(2)C(1)im][HSO4] and [C(4)C(1)im][HSO4], as Raman spectroscopy shows that the latter does not form the crystalline phase with extended anion-anion chains.
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Details
- Title
- Ultraslow Phase Transitions in an Anion-Anion Hydrogen-Bonded Ionic Liquid
- Creators
- Luiz F. O. Faria - Universidade de São PauloThamires A. Lima - Universidade de São PauloFabio F. Ferreira - Universidade Federal do ABCMauro C. C. Ribeiro - Universidade de São Paulo
- Publication Details
- The journal of physical chemistry. B, v 122(6), pp 1972-1980
- 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:000425570700021
- Scopus ID
- 2-s2.0-85042164299
- Other Identifier
- 991019299115404721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical