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Raman spectroscopy of ionic liquids derived from 1‐n‐butyl‐3‐methylimidazolium chloride and niobium chloride or zinc chloride mixtures
Author(s) -
Alves Melquizedeque B.,
Santos jr. Vianney O.,
Soares Valerio C. D.,
Suarez Paulo A. Z.,
Rubim Joel C.
Publication year - 2008
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2009
Subject(s) - chemistry , chloride , zinc , raman spectroscopy , inorganic chemistry , niobium , ionic liquid , hydrogen bond , hydrogen chloride , ion , ionic bonding , molecule , organic chemistry , catalysis , physics , optics
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 NbCl 5) 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 ZnCl 2< 0.35) and Zn 2 Cl 6 2− ( X ZnCl 2> 0.3), whereas for acidic ones three species were detected: Zn 2 Cl 6 2− ( X ZnCl 2< 0.7), Zn 3 Cl 8 2− ( X ZnCl 2> 0.7) and Zn 4 Cl 10 2− ( X ZnCl 2> 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.