Structural Anomalies in Binary Mixtures of Ionic Liquid [Bmim]BF4 with Water Studied by EPR Full article
| Journal |
The Journal of Physical Chemistry B
ISSN: 1520-6106 , E-ISSN: 1520-5207 |
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| Output data | Year: 2019, Volume: 123, Number: 46, Pages: 9956-9962 Pages count : 7 DOI: 10.1021/acs.jpcb.9b08933 | ||||||
| Tags | SPIN PROBES; PHYSICAL-PROPERTIES; AQUEOUS-SOLUTIONS; TEMPERATURE; VISCOSITY; SOLVENTS; DIFFUSION; CHLORIDE; TETRAFLUOROBORATE; HETEROGENEITIES | ||||||
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 19-13-00071 |
Abstract:
Ionic liquids (ILs) show a variety of unusual and intriguing properties on a molecular level. Recently, a new type of structural anomaly occurring in neat ILs near their glass transition temperatures (T-g) has been found. In particular, the coexistence of two types of IL environments was observed, one of which progressively suppresses the molecular mobility upon temperature increase within similar to(T-g-60 K) and T-g. To clarify the nature of these anomalies, their general characteristics, and potential for applications, in this work we investigated the molecular mobility in binary mixtures of IL [Bmim]BF4 with water using electron paramagnetic resonance spectroscopy and spin probes (stable nitroxides TEMPO-D-18, (2,2,6,6-tetramethylpiperidin-1-yl)oxyl, and 14-carbamoyl-7-azadispiro[5.1.5.2]pentadeca-14-ene-7-oxyl). In a series of such mixtures with water content X-H2O = 0.2-50 wt %, we detected similar anomalies to those found in neat IL (x(H2O) = 0). For x(H2O) < 2.5 wt %, the differences in manifestations of structural anomalies are negligible compared to those in neat ILs. In the range 2.5 <= X-H2O < 5 wt %, an abrupt partial suppression of anomaly is observed, but further increase of the water content up to X-H2O = 50 wt % has no impact on anomaly since, most plausibly, it leads only to the growth of the water-rich domains. Consequently, the observed structural anomalies are rather robust against the presence of water in ILs, which is beneficial for their potential applications.
Cite:
Ivanov M.Y.
, Prikhod’ko S.A.
, Adonin N.Y.
, Fedin M.V.
Structural Anomalies in Binary Mixtures of Ionic Liquid [Bmim]BF4 with Water Studied by EPR
The Journal of Physical Chemistry B. 2019. V.123. N46. P.9956-9962. DOI: 10.1021/acs.jpcb.9b08933 WOS Scopus РИНЦ ANCAN PMID OpenAlex
Structural Anomalies in Binary Mixtures of Ionic Liquid [Bmim]BF4 with Water Studied by EPR
The Journal of Physical Chemistry B. 2019. V.123. N46. P.9956-9962. DOI: 10.1021/acs.jpcb.9b08933 WOS Scopus РИНЦ ANCAN PMID OpenAlex
Dates:
| Submitted: | Sep 20, 2019 |
| Accepted: | Oct 24, 2019 |
| Published online: | Oct 25, 2019 |
| Published print: | Nov 21, 2019 |
Identifiers:
| Web of science: | WOS:000499739800023 |
| Scopus: | 2-s2.0-85075129105 |
| Elibrary: | 43211536 |
| Chemical Abstracts: | 2019:2035381 |
| Chemical Abstracts (print): | 171:525037 |
| PMID: | 31651169 |
| OpenAlex: | W2982077088 |