Diffusion of tetrathiafulvalene and its radical cation in ionic liquids in comparison to conventional solvents

Thi Hai Yen Ha; Stephan Landgraf; Günter Grampp; Kenneth Rasmussen

doi:10.1016/j.electacta.2014.07.011

Diffusion of tetrathiafulvalene and its radical cation in ionic liquids in comparison to conventional solvents

Thi Hai Yen Ha^*, Stephan Landgraf, Günter Grampp, Kenneth Rasmussen

^*Corresponding author for this work

Institute of Physical and Theoretical Chemistry (6350)

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

Abstract

The diffusion properties of tetrathiafulvalene (TTF) and its radical cation (TTF.+) have been studied in organic solvents and in eight imidazolium-based ionic liquids (ILs). The values of the diffusion coefficients of TTF and TTF.+ were obtained by using cyclic and steady-state voltammetry (only for TTF) over a range of 293-343 K. The temperature-dependence of the diffusion coefficients gave good conformity to an Arrhenius-type relation. The diffusional activation energies of TTF and TTF.+ in ILs were found to be similar and compared well to the activation energy of viscous flow for the corresponding IL. The diffusion of TTF.+ in ILs was slower than that of TTF. The ratio in the diffusion coefficients of TTF.+ and TTF at 293 K was observed to be 0.43-0.62 in five ILs, as compared to 0.90 in acetonitrile. The diffusion of TTF and TTF.+ was described using the Stokes-Einstein and Sutherland models.

Original language	English
Pages (from-to)	72-81
Journal	Electrochimica Acta
Volume	141
DOIs	https://doi.org/10.1016/j.electacta.2014.07.011
Publication status	Published - 2014

Fields of Expertise

Advanced Materials Science

Treatment code (Nähere Zuordnung)

Experimental

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10.1016/j.electacta.2014.07.011

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title = "Diffusion of tetrathiafulvalene and its radical cation in ionic liquids in comparison to conventional solvents",

abstract = "The diffusion properties of tetrathiafulvalene (TTF) and its radical cation (TTF.+) have been studied in organic solvents and in eight imidazolium-based ionic liquids (ILs). The values of the diffusion coefficients of TTF and TTF.+ were obtained by using cyclic and steady-state voltammetry (only for TTF) over a range of 293-343 K. The temperature-dependence of the diffusion coefficients gave good conformity to an Arrhenius-type relation. The diffusional activation energies of TTF and TTF.+ in ILs were found to be similar and compared well to the activation energy of viscous flow for the corresponding IL. The diffusion of TTF.+ in ILs was slower than that of TTF. The ratio in the diffusion coefficients of TTF.+ and TTF at 293 K was observed to be 0.43-0.62 in five ILs, as compared to 0.90 in acetonitrile. The diffusion of TTF and TTF.+ was described using the Stokes-Einstein and Sutherland models.",

author = "Ha, {Thi Hai Yen} and Stephan Landgraf and G{\"u}nter Grampp and Kenneth Rasmussen",

year = "2014",

doi = "10.1016/j.electacta.2014.07.011",

language = "English",

volume = "141",

pages = "72--81",

journal = "Electrochimica Acta",

issn = "1873-3859",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Diffusion of tetrathiafulvalene and its radical cation in ionic liquids in comparison to conventional solvents

AU - Ha, Thi Hai Yen

AU - Landgraf, Stephan

AU - Grampp, Günter

AU - Rasmussen, Kenneth

PY - 2014

Y1 - 2014

N2 - The diffusion properties of tetrathiafulvalene (TTF) and its radical cation (TTF.+) have been studied in organic solvents and in eight imidazolium-based ionic liquids (ILs). The values of the diffusion coefficients of TTF and TTF.+ were obtained by using cyclic and steady-state voltammetry (only for TTF) over a range of 293-343 K. The temperature-dependence of the diffusion coefficients gave good conformity to an Arrhenius-type relation. The diffusional activation energies of TTF and TTF.+ in ILs were found to be similar and compared well to the activation energy of viscous flow for the corresponding IL. The diffusion of TTF.+ in ILs was slower than that of TTF. The ratio in the diffusion coefficients of TTF.+ and TTF at 293 K was observed to be 0.43-0.62 in five ILs, as compared to 0.90 in acetonitrile. The diffusion of TTF and TTF.+ was described using the Stokes-Einstein and Sutherland models.

AB - The diffusion properties of tetrathiafulvalene (TTF) and its radical cation (TTF.+) have been studied in organic solvents and in eight imidazolium-based ionic liquids (ILs). The values of the diffusion coefficients of TTF and TTF.+ were obtained by using cyclic and steady-state voltammetry (only for TTF) over a range of 293-343 K. The temperature-dependence of the diffusion coefficients gave good conformity to an Arrhenius-type relation. The diffusional activation energies of TTF and TTF.+ in ILs were found to be similar and compared well to the activation energy of viscous flow for the corresponding IL. The diffusion of TTF.+ in ILs was slower than that of TTF. The ratio in the diffusion coefficients of TTF.+ and TTF at 293 K was observed to be 0.43-0.62 in five ILs, as compared to 0.90 in acetonitrile. The diffusion of TTF and TTF.+ was described using the Stokes-Einstein and Sutherland models.

U2 - 10.1016/j.electacta.2014.07.011

DO - 10.1016/j.electacta.2014.07.011

M3 - Article

SN - 1873-3859

VL - 141

SP - 72

EP - 81

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

Diffusion of tetrathiafulvalene and its radical cation in ionic liquids in comparison to conventional solvents

Abstract

Fields of Expertise

Treatment code (Nähere Zuordnung)

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