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Issue 13, 2006

Influence of structural variations in 1-alkyl-3-methylimidazoliumcation and tetrahalogenoferrate(iii) anion on the physical properties of the paramagnetic ionic liquids

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Abstract

A series of paramagnetic ionic liquids, which are comprised of 1-alkyl-3-methylimidazolium RMI+ cation (R = Et, n-Bu, n-hexyl and n-octyl) and tetrahalogenoferrate(III) FeX4 anion (X = Cl and Br), were prepared, and the influence of structural variations such as changing the alkyl chain (R) length in the cation and substituting the halides (X) in the anion on their thermal behavior, infrared and ultraviolet-visible absorption spectra, density, viscosity, ionic conductivity and magnetic susceptibility was characterized. The elongation of the alkyl chain leads to a pronounced reduction of fluidity and ionic conductivity, and the replacement of chlorides with bromides likewise leads to a similar tendency toward ionic diffusion. It would seem that the ion association is less pronounced in the FeBr4 salts, which can be rationalized on the basis of the more significant nephelauxetic effect together with the lower molar concentration in the FeBr4 salts.

Graphical abstract: Influence of structural variations in 1-alkyl-3-methylimidazolium cation and tetrahalogenoferrate(iii) anion on the physical properties of the paramagnetic ionic liquids

Article information


Submitted
31 Oct 2005
Accepted
14 Dec 2005
First published
09 Jan 2006

J. Mater. Chem., 2006,16, 1254-1262
Article type
Paper

Influence of structural variations in 1-alkyl-3-methylimidazolium cation and tetrahalogenoferrate(III) anion on the physical properties of the paramagnetic ionic liquids

Y. Yoshida and G. Saito, J. Mater. Chem., 2006, 16, 1254 DOI: 10.1039/B515391C

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