TY - JOUR
T1 - Solvatochromism of Binary Mixtures of 2,2,2-Trifluoroethanol + Ionic Liquid [bmim][Tf2N]
T2 - A Comparative Study with Molecular Solvents
AU - Islam, Md Rabiul
AU - Warsi, Faiz
AU - Khan, Abbul Bashar
AU - Kausar, Tasneem
AU - Khan, Imran
AU - Ali, Maroof
N1 - Funding Information:
*E-mail: maroof.ch@amu.ac.in, mdmaroof@gmail.com. ORCID Maroof Ali: 0000-0003-0296-5327 Funding This work is generously supported by the CSIR, India, through JRF to M.R.I., UGC start-up grant to M.A., and departmental facility by UGC, SAP, DRS II.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/3/14
Y1 - 2019/3/14
N2 - The cosolvent modified ionic liquid (IL) systems have become an area of active research for the past few years because favorably modified properties can be achieved in such mixed systems which may enhance their utility as solvent media in chemical applications. Here, we show that mixtures of room temperature ionic liquid, 1-butyl-3-methylimidazoliumbis(trifluorosulphonyl)imide, [bmim][Tf2N], and 2,2,2-trifluoroethanol (TFE) exhibit the fascinating circumstance of hyperpolarity. The normalized Reichardt polarity parameter ETN, hydrogen bond acidity (α), and basicity (β) of the TFE + IL mixtures are even higher than those of both neat TFE and IL components. A comparative study of TFE + IL has also been done with TFE + molecular organic solvents, polar protic (polyethylene glycol-200 and 1-butanol), polar aprotic (N,N-dimethylformamide), and nonpolar (1,4-dioxane) mixtures; however, these mixtures do not exhibit such a type of hyperpolarity behavior. The effect of solute-solvent as well as solvent-solvent interactions on the solvatochromic behavior of absorbance probes in TFE-based binary mixtures is considered a possible reason for the hyperpolarity. Further, a preferential solvation model approach and MD simulation study have been successfully used to gather information regarding the cybotactic region of indicator dyes and to achieve information on solvent-solvent and solute-solvent interactions in binary mixtures.
AB - The cosolvent modified ionic liquid (IL) systems have become an area of active research for the past few years because favorably modified properties can be achieved in such mixed systems which may enhance their utility as solvent media in chemical applications. Here, we show that mixtures of room temperature ionic liquid, 1-butyl-3-methylimidazoliumbis(trifluorosulphonyl)imide, [bmim][Tf2N], and 2,2,2-trifluoroethanol (TFE) exhibit the fascinating circumstance of hyperpolarity. The normalized Reichardt polarity parameter ETN, hydrogen bond acidity (α), and basicity (β) of the TFE + IL mixtures are even higher than those of both neat TFE and IL components. A comparative study of TFE + IL has also been done with TFE + molecular organic solvents, polar protic (polyethylene glycol-200 and 1-butanol), polar aprotic (N,N-dimethylformamide), and nonpolar (1,4-dioxane) mixtures; however, these mixtures do not exhibit such a type of hyperpolarity behavior. The effect of solute-solvent as well as solvent-solvent interactions on the solvatochromic behavior of absorbance probes in TFE-based binary mixtures is considered a possible reason for the hyperpolarity. Further, a preferential solvation model approach and MD simulation study have been successfully used to gather information regarding the cybotactic region of indicator dyes and to achieve information on solvent-solvent and solute-solvent interactions in binary mixtures.
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U2 - 10.1021/acs.jced.8b01068
DO - 10.1021/acs.jced.8b01068
M3 - Article
AN - SCOPUS:85063010722
SN - 0021-9568
VL - 64
SP - 1140
EP - 1154
JO - Journal of Chemical and Engineering Data
JF - Journal of Chemical and Engineering Data
IS - 3
ER -