High conductivity and low viscosity Brønsted acidic ionic liquids with oligomeric anions

Tzi Yi Wu; I. Wen Sun; Shr Tusen Gung; Bor Kuan Chen; H. Paul Wang; Shyh Gang Su

doi:10.1016/j.jtice.2011.01.008

High conductivity and low viscosity Brønsted acidic ionic liquids with oligomeric anions

Tzi Yi Wu, I. Wen Sun, Shr Tusen Gung, Bor Kuan Chen, H. Paul Wang, Shyh Gang Su

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

Two series of Brønsted acidic room temperature ionic liquids (RTILs) comprising of oligomeric anions and cyclic amine based cations are prepared. All RTILs studied here are liquids and have a high ionic conductivity (up to 20.96. mS/cm) and a low viscosity (down to 10.4. mPa. s) at room temperature. The incorporation of oligomeric anions in ILs significantly increases the density and conductivity, and decreases the viscosity. The temperature-dependent electrolyte viscosity with molar conductivity is correlated through applying an empirical Walden's rule. A relatively larger deviation of the plots from the " ideal" Walden line is observed for the ILs synthesized by equal molar acid and base, although the deviation decreases significantly when the ILs contain oligomeric anions. Spectroscopic measurements of solvatochromic probe molecules in RTILs provide insights into solvent intermolecular interactions through interpretation of the different and generally uncorrelated polarity scales.

Original language	English
Pages (from-to)	874-881
Number of pages	8
Journal	Journal of the Taiwan Institute of Chemical Engineers
Volume	42
Issue number	5
DOIs	https://doi.org/10.1016/j.jtice.2011.01.008
Publication status	Published - 2011 Sept

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering

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10.1016/j.jtice.2011.01.008

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abstract = "Two series of Br{\o}nsted acidic room temperature ionic liquids (RTILs) comprising of oligomeric anions and cyclic amine based cations are prepared. All RTILs studied here are liquids and have a high ionic conductivity (up to 20.96. mS/cm) and a low viscosity (down to 10.4. mPa. s) at room temperature. The incorporation of oligomeric anions in ILs significantly increases the density and conductivity, and decreases the viscosity. The temperature-dependent electrolyte viscosity with molar conductivity is correlated through applying an empirical Walden's rule. A relatively larger deviation of the plots from the {"} ideal{"} Walden line is observed for the ILs synthesized by equal molar acid and base, although the deviation decreases significantly when the ILs contain oligomeric anions. Spectroscopic measurements of solvatochromic probe molecules in RTILs provide insights into solvent intermolecular interactions through interpretation of the different and generally uncorrelated polarity scales.",

author = "Wu, {Tzi Yi} and Sun, {I. Wen} and Gung, {Shr Tusen} and Chen, {Bor Kuan} and Wang, {H. Paul} and Su, {Shyh Gang}",

note = "Funding Information: The authors would like to thank the National Science Council of the Republic of China for financially supporting this project. The authors also gratefully acknowledge the contributions of Chao-anx Lai, Department of chemistry, National Cheng Kung University, for helping with the laboratory work. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.",

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doi = "10.1016/j.jtice.2011.01.008",

language = "English",

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AU - Wu, Tzi Yi

AU - Sun, I. Wen

AU - Gung, Shr Tusen

AU - Chen, Bor Kuan

AU - Wang, H. Paul

AU - Su, Shyh Gang

N1 - Funding Information: The authors would like to thank the National Science Council of the Republic of China for financially supporting this project. The authors also gratefully acknowledge the contributions of Chao-anx Lai, Department of chemistry, National Cheng Kung University, for helping with the laboratory work. Copyright: Copyright 2011 Elsevier B.V., All rights reserved.

PY - 2011/9

Y1 - 2011/9

N2 - Two series of Brønsted acidic room temperature ionic liquids (RTILs) comprising of oligomeric anions and cyclic amine based cations are prepared. All RTILs studied here are liquids and have a high ionic conductivity (up to 20.96. mS/cm) and a low viscosity (down to 10.4. mPa. s) at room temperature. The incorporation of oligomeric anions in ILs significantly increases the density and conductivity, and decreases the viscosity. The temperature-dependent electrolyte viscosity with molar conductivity is correlated through applying an empirical Walden's rule. A relatively larger deviation of the plots from the " ideal" Walden line is observed for the ILs synthesized by equal molar acid and base, although the deviation decreases significantly when the ILs contain oligomeric anions. Spectroscopic measurements of solvatochromic probe molecules in RTILs provide insights into solvent intermolecular interactions through interpretation of the different and generally uncorrelated polarity scales.

AB - Two series of Brønsted acidic room temperature ionic liquids (RTILs) comprising of oligomeric anions and cyclic amine based cations are prepared. All RTILs studied here are liquids and have a high ionic conductivity (up to 20.96. mS/cm) and a low viscosity (down to 10.4. mPa. s) at room temperature. The incorporation of oligomeric anions in ILs significantly increases the density and conductivity, and decreases the viscosity. The temperature-dependent electrolyte viscosity with molar conductivity is correlated through applying an empirical Walden's rule. A relatively larger deviation of the plots from the " ideal" Walden line is observed for the ILs synthesized by equal molar acid and base, although the deviation decreases significantly when the ILs contain oligomeric anions. Spectroscopic measurements of solvatochromic probe molecules in RTILs provide insights into solvent intermolecular interactions through interpretation of the different and generally uncorrelated polarity scales.

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High conductivity and low viscosity Brønsted acidic ionic liquids with oligomeric anions

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