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Transport Properties Investigation of Aqueous Protic Ionic Liquid Solutions Through Conductivity, Viscosity and NMR Self-Diffusion Measurements.
MedLine Citation:
PMID:  22404286     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We present here a study on the transport properties such as the conductivity (), viscosity () and self-diffusion coefficients (D) of two pure protic ionic liquids: pyrrolidinium hydrogen sulfate, [Pyrr][HSO4], and pyrrolidinium trifluoroacetate, [Pyrr][CF3COO], and their mixtures with water over the whole composition range at 298.15 K and atmospheric pressure. Based on these experimental results, transport mobilities of ions were then investigated in each case through the Stokes-Einstein equation. The proton conduction in these PILs follows a combination of Grotthuss and vehicle-type mechanisms, which depends also of the water composition in solution. Displacement of the peak attributed to the labile proton with the PILs concentration in aqueous solution indicates that for a water mass fraction lower than 8% w/w the proton is located between the cation and the anion and is not solvated by water. However for higher water content, the labile protons are in solution as H3O+. This water mass fraction appears to be the solvation limit of the H+ ions by water molecules. [Pyrr][HSO4] and [Pyrr][CF3COO] PILs present opposed comportment in aqueous solution. In the case of [Pyrr][CF3COO], , , (D) and the attractive potential, Epot, between ions indicate that the diffusion of each ion is similar. In other words, these ions are tightly bound together as ion-pairs, reflecting in fact the importance of the hydrophobicity of trifluoroacetate anion. Whereas, [Pyrr][HSO4] the strong H-bond between the HSO4- anion and water promotes a drastic change in viscosity and condictivity up to 187 mS.cm-1 at 298 K for water mass fraction about 60% .
Authors:
Mérièm Anouti; Johan Jacquemin; Patrice Porion
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-9
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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