Article (Scientific journals)
Tentative determination of the acidity level in room temperature ionic liquids by electrochemical methods
Malherbe, Cédric; Robert, Thierry; Magna, Lionel et al.
2009In ECS Transactions, 16 (49), p. 3
Peer reviewed
 

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Keywords :
ionic liquids; Strehlow acidity function
Abstract :
[en] In our attempt to evaluate the acidity levels reached by acidified ionic liquids (BMImBF4, BMImNTf2 and BMImOTf + HOTf or HNTf2), the uncertainty on the pKas of the indicators needed for the Hammett spectrophotometric procedure was pointed out. As consequence another method is proposed, based on the H+/H2 couple potential measurement. In this purpose, if dynamic methods failed mainly for lack of sufficient reversibility, potentiometry with a hydrogen electrode gave meaningful results. The R0(H+) Strehlow function, could be calculated, using the Fc+-Fc couple as reference assumed as solvent independent. The obtained results show that i) the acidities are much higher than those in water; ii) the acidities measured by the hydrogen electrode are higher than those measured by the Hammett method; iii) the sequence of acidities for solutions of similar content of added acid is still BF4 > NTf2 > OTf as previously measured with the Hammett method.
Disciplines :
Chemistry
Author, co-author :
Malherbe, Cédric ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique et électrochimie
Robert, Thierry ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique et électrochimie
Magna, Lionel;  Institut Français du Pétrol - IFP
Olivier-Bourbigou, Hélène;  Institut Français du Pétrol - IFP
Gilbert, Bernard ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
Tentative determination of the acidity level in room temperature ionic liquids by electrochemical methods
Publication date :
2009
Journal title :
ECS Transactions
ISSN :
1938-5862
eISSN :
1938-6737
Publisher :
The Electrochemical Society, Pennington, United States - New Jersey
Volume :
16
Issue :
49
Pages :
3
Peer reviewed :
Peer reviewed
Funders :
IFP - Institut Français du Pétrole [FR]
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