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Temperature-dependent gel-type ionic liquid compounds based on vanadium-substituted polyoxometalates with Keggin structure.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 3/7/2016, Vol. 45 Issue 9, p3958-3963, 6p
- Publication Year :
- 2016
-
Abstract
- A series of temperature-dependent gel-type ionic liquid compounds have been synthesized from 1-(3-sulfonic group) propyl-3-methyl imidazolium (abbreviated as MIMPS) and three vanadium-substituted heteropoly acids H<subscript>5</subscript>SiW<subscript>11</subscript>VO<subscript>40</subscript>, H<subscript>5</subscript>SiMo<subscript>11</subscript>VO<subscript>40</subscript> and H<subscript>7</subscript>SiW<subscript>9</subscript>V<subscript>3</subscript>O<subscript>40</subscript>. The designed and synthesized gel-type polyoxometalate ionic liquids (POM-ILs) have demonstrated a tendency to exhibit a layered structure. Moreover, they can undergo a phase transformation from a viscous gel-state to a liquid-state below 100 °C, and ionic conductivity up to 10<superscript>−3</superscript> S cm<superscript>−1</superscript> was observed at 120 °C. Cyclic voltammetry was carried out to study their electrochemical properties in organic solutions, and it was found that the oxidizability of the three POM-ILs decreases in the order: [MIMPS]<subscript>7</subscript>SiW<subscript>9</subscript>V<subscript>3</subscript>O<subscript>40</subscript> > [MIMPS]<subscript>5</subscript>SiMo<subscript>11</subscript>VO<subscript>40</subscript> > [MIMPS]<subscript>5</subscript>SiW<subscript>11</subscript>VO<subscript>40</subscript>. This result indicates that the redox behavior can be tuned by changing the chemical composition of the heteropolyanions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 45
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 113278304
- Full Text :
- https://doi.org/10.1039/c5dt05055c