Thermophysical properties of room temperature ionic liquids with oligomeric formate and hydrogen sulfate

Tzi Yi Wu; I. Wen Sun; Ming Wei Lin; Bor Kuan Chen; Chung Wen Kuo; H. Paul Wang; Yu Yuan Chen; Shyh Gang Su

doi:10.1016/j.jtice.2011.06.010

Thermophysical properties of room temperature ionic liquids with oligomeric formate and hydrogen sulfate

Tzi Yi Wu, I. Wen Sun, Ming Wei Lin, Bor Kuan Chen, Chung Wen Kuo, H. Paul Wang, Yu Yuan Chen, Shyh Gang Su

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

18 Citations (Scopus)

Abstract

Brønsted acid room temperature ionic liquids (RTILs) comprised of oligomeric formate (or hydrogen sulfate) anions and pyrrolidinium-based cations are prepared. It is found that ion identity greatly affects the thermophysical properties. All RTILs studied here are liquid and have a high ionic conductivity (up to 55.4mS/cm) and a low viscosity (down to 6.42mPas) at room temperature. The incorporation of oligomeric anions in ILs significantly increases the density and conductivity, and decreases the viscosity. The correlation between ionic conductivity and viscosity is based on the classical Walden rule; a relatively large deviation of the plots from the ideal Walden line is observed for formate-based ILs synthesized using equimolar amounts of acid and base, whereas the deviation decreases significantly when the formate-based ILs contain oligomeric anions. The Stokes-Einstein plot of DT ^-1 vs η ^-1 for ferrocence in ILs shows that hydrodynamic radius of diffusing species is independent of temperature.

Original language	English
Pages (from-to)	58-66
Number of pages	9
Journal	Journal of the Taiwan Institute of Chemical Engineers
Volume	43
Issue number	1
DOIs	https://doi.org/10.1016/j.jtice.2011.06.010
Publication status	Published - 2012 Jan

All Science Journal Classification (ASJC) codes

General Chemistry
General Chemical Engineering

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10.1016/j.jtice.2011.06.010

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title = "Thermophysical properties of room temperature ionic liquids with oligomeric formate and hydrogen sulfate",

abstract = "Br{\o}nsted acid room temperature ionic liquids (RTILs) comprised of oligomeric formate (or hydrogen sulfate) anions and pyrrolidinium-based cations are prepared. It is found that ion identity greatly affects the thermophysical properties. All RTILs studied here are liquid and have a high ionic conductivity (up to 55.4mS/cm) and a low viscosity (down to 6.42mPas) at room temperature. The incorporation of oligomeric anions in ILs significantly increases the density and conductivity, and decreases the viscosity. The correlation between ionic conductivity and viscosity is based on the classical Walden rule; a relatively large deviation of the plots from the ideal Walden line is observed for formate-based ILs synthesized using equimolar amounts of acid and base, whereas the deviation decreases significantly when the formate-based ILs contain oligomeric anions. The Stokes-Einstein plot of DT -1 vs η -1 for ferrocence in ILs shows that hydrodynamic radius of diffusing species is independent of temperature.",

author = "Wu, {Tzi Yi} and Sun, {I. Wen} and Lin, {Ming Wei} and Chen, {Bor Kuan} and Kuo, {Chung Wen} and Wang, {H. Paul} and Chen, {Yu Yuan} 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 2012 Elsevier B.V., All rights reserved.",

year = "2012",

month = jan,

doi = "10.1016/j.jtice.2011.06.010",

language = "English",

volume = "43",

pages = "58--66",

journal = "Journal of the Taiwan Institute of Chemical Engineers",

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T1 - Thermophysical properties of room temperature ionic liquids with oligomeric formate and hydrogen sulfate

AU - Wu, Tzi Yi

AU - Sun, I. Wen

AU - Lin, Ming Wei

AU - Chen, Bor Kuan

AU - Kuo, Chung Wen

AU - Wang, H. Paul

AU - Chen, Yu Yuan

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 2012 Elsevier B.V., All rights reserved.

PY - 2012/1

Y1 - 2012/1

N2 - Brønsted acid room temperature ionic liquids (RTILs) comprised of oligomeric formate (or hydrogen sulfate) anions and pyrrolidinium-based cations are prepared. It is found that ion identity greatly affects the thermophysical properties. All RTILs studied here are liquid and have a high ionic conductivity (up to 55.4mS/cm) and a low viscosity (down to 6.42mPas) at room temperature. The incorporation of oligomeric anions in ILs significantly increases the density and conductivity, and decreases the viscosity. The correlation between ionic conductivity and viscosity is based on the classical Walden rule; a relatively large deviation of the plots from the ideal Walden line is observed for formate-based ILs synthesized using equimolar amounts of acid and base, whereas the deviation decreases significantly when the formate-based ILs contain oligomeric anions. The Stokes-Einstein plot of DT -1 vs η -1 for ferrocence in ILs shows that hydrodynamic radius of diffusing species is independent of temperature.

AB - Brønsted acid room temperature ionic liquids (RTILs) comprised of oligomeric formate (or hydrogen sulfate) anions and pyrrolidinium-based cations are prepared. It is found that ion identity greatly affects the thermophysical properties. All RTILs studied here are liquid and have a high ionic conductivity (up to 55.4mS/cm) and a low viscosity (down to 6.42mPas) at room temperature. The incorporation of oligomeric anions in ILs significantly increases the density and conductivity, and decreases the viscosity. The correlation between ionic conductivity and viscosity is based on the classical Walden rule; a relatively large deviation of the plots from the ideal Walden line is observed for formate-based ILs synthesized using equimolar amounts of acid and base, whereas the deviation decreases significantly when the formate-based ILs contain oligomeric anions. The Stokes-Einstein plot of DT -1 vs η -1 for ferrocence in ILs shows that hydrodynamic radius of diffusing species is independent of temperature.

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Thermophysical properties of room temperature ionic liquids with oligomeric formate and hydrogen sulfate

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