Transport properties and intermolecular interactions in binary mixtures based on the protic ionic liquid ethylimidazolium triflate and ethylene glycol

Physical Chemistry Chemical Physics : PCCP
Negin YaghiniAnna Martinelli

Abstract

The binary mixture based on the protic ionic liquid (PIL) ethylimidazolium triflate (C2HImTfO) and the diol compound ethylene glycol (EG) has been investigated in the whole composition range from pure PIL to pure EG. At 30 °C the addition of EG increases both the ionic conductivity and the self-diffusivity of the ions. These quantities, however, change at different rates suggesting that the ionicity of the system is composition dependent. This behaviour is explained by means of new intermolecular forces established when a second compound like EG is introduced into the ionic network. More specifically, a complex H-bonded network is formed that involves the -NH group of the cation, the -OH group of EG and the -SO3 group of the anion. This configuration may increase the fluidity of the mixture but not necessarily the ionic dissociation. Moreover, diffusion NMR results indicate the occurrence of local proton dynamics, which arise from a proton exchange between the -NH of the cation and the -OH of EG, providing the requisite for a long-range Grotthuss mechanism of proton transport.

References

Jul 30, 2009·The Journal of Physical Chemistry. B·Christopher M BurbaRoger Frech
Feb 23, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Tejwant SinghArvind Kumar
Dec 31, 2014·The Journal of Physical Chemistry. B·Negin YaghiniAnna Martinelli
Jul 25, 2015·The Journal of Physical Chemistry. B·Tatsiana BurankovaJan P Embs
Feb 13, 2016·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Anil KumarNageshwar Khupse

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Citations

Jun 24, 2020·The Journal of Chemical Physics·Hailong PanMichael Wübbenhorst

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Methods Mentioned

BETA
nuclear magnetic resonance
NMR

Software Mentioned

Topspin

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