Transport Properties of Protic Ionic Liquids Based on Triazolium and Imidazolium: Development of an Air-Free Conductivity Setup
Artikel i vetenskaplig tidskrift, 2023

The dynamical properties of four protic ionic liquids, based on the ethyltriazolium ([C (Formula presented.) HTr (Formula presented.) ]) and the ethylimidazolium ([C (Formula presented.) HIm]) cation, were investigated. The associated anions were the triflate ([TfO]) and the bistriflimide ([TFSI]). Ionic conductivity values and self-diffusion coefficients were measured and discussed, extending the discussion to the concept of fragility. Furthermore, in order to allow the measurement of the ionic conductivity of very small volumes (<0.5 mL) of ionic liquid under an inert and dry atmosphere, a new setup was developed. It was found that the cation nature strongly affected the transport properties, the [C (Formula presented.) HTr (Formula presented.) ] cation resulting in slower dynamics than the [C (Formula presented.) HIm] one. This was concluded from both conductivity and diffusivity measurements while for both properties, the anion had a lesser effect. By fitting the conductivity data with the Vogel–Fulcher–Tammann (VFT) equation, we could also estimate the fragility of these ionic liquids, which all fell in the range of very fragile glass-forming materials. Finally, the slower dynamics observed in the triazolium-based ionic liquids can be rationalized by the stronger interactions that this cation establishes with both anions, as deduced from the frequency analysis of relevant Raman signatures and density functional theory (DFT) calculations.

self-diffusion

triazolium

imidazolium

ionic conductivity

fragility

protic ionic liquids

Författare

Eduardo Maurina Morais

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Alexander Idström

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Lars Evenäs

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Anna Martinelli

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Molecules

1420-3049 (ISSN) 14203049 (eISSN)

Vol. 28 13 5147

Ökad protonledning i protiska jonvätskor genom självorganiserad syra-baskemi

Vetenskapsrådet (VR) (2018-05207), 2019-01-01 -- 2022-12-31.

Ämneskategorier

Fysikalisk kemi

Materialkemi

Annan kemi

Annan materialteknik

Den kondenserade materiens fysik

DOI

10.3390/molecules28135147

PubMed

37446808

Mer information

Senast uppdaterat

2023-07-27