Transport properties and intermolecular interactions in binary mixtures based on the protic ionic liquid ethylimidazolium triflate and ethylene glycol
Artikel i vetenskaplig tidskrift, 2018

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 -SO3group 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.

Författare

Negin Yaghini

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Iqbaal Abdurrokhman

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Anna Martinelli Group

Mohammad Hasani

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Anna Martinelli Group

Anna Martinelli

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Anna Martinelli Group

Physical Chemistry Chemical Physics

1463-9076 (ISSN) 1463-9084 (eISSN)

Vol. 20 35 22980-22986

Ämneskategorier

Oorganisk kemi

Fysikalisk kemi

Biofysik

DOI

10.1039/c8cp03093f

Mer information

Senast uppdaterat

2018-10-18