Raman spectroscopy of ionic liquids derived from 1-n-butyl-3-methylimidazolium chloride and niobium chloride or zinc chloride mixtures
✍ Scribed by Melquizedeque B. Alves; Vianney O. Santos jr.; Valerio C. D. Soares; Paulo A. Z. Suarez; Joel C. Rubim
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 314 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0377-0486
- DOI
- 10.1002/jrs.2009
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✦ Synopsis
Abstract
Anionic species formed in mixtures of 1‐n‐butyl‐3‐methylimidazolium chloride (BMICl) with different amounts of niobium pentachloride (NbCl~5~) or zinc dichloride (ZnCl~2~) were investigated by Raman spectroscopy. In the BMICl and NbCl~5~ ionic mixtures the presence of the anion NbCl~6~^−^ was detected for all compositions (molar fraction, X) and a mixture of this anion and the neutral Nb~2~Cl~10~ in acid ones. Two different anions were observed for basic mixtures of BMICl and ZnCl~2~: ZnCl~4~^2−^(0 < X < 0.35) and Zn~2~Cl~6~^2−^(X > 0.3), whereas for acidic ones three species were detected: Zn~2~Cl~6~^2−^(X < 0.7), Zn~3~Cl~8~^2−^(X > 0.7) and Zn~4~Cl~10~^2−^(X > 0.7). It has also been observed that in both cases, the formation of larger anions causes a shift of the CH stretching modes to higher wavenumbers as the result of a decrease in the hydrogen bond between Cl and the hydrogens from the cation. Copyright © 2008 John Wiley & Sons, Ltd.