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About the Acidity Level in Room Temperature Ionic Liquids
Robert, Thierry; Olivier-Bourbigou, Hélène; Magna, Lionel et al.
2007In ECS Transactions, 3 (35), p. 71
Peer reviewed
 

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Keywords :
ionic liquids; bronsted acidity; Hammett function
Abstract :
[en] The Brønsted acidity level was evaluated for ionic liquids to which a strong acid has been added. The evaluation method is based on the determination of the Hammett acidity functions H0, using UV-Visible spectroscopy. The acidity of protons is mainly determined by their solvation state and consequently, the properties of protons depend on both the nature of the solvent and the nature and concentration of the acid. In practice, it was found that, for the investigated ionic liquids, the cation as well as the added acid nature does not play a dominant role, whereas changing the anion nature may lead to very different acidities. Indeed, for a similar content of added acid, the measured acidity levels are in the order: PF6- > BF4- > NTf2- > OTf-. The problems of the influence of impurities on the final acidity and of the weakly dissociating character of the ionic liquid are addressed.
Disciplines :
Chemistry
Author, co-author :
Robert, Thierry ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique et électrochimie
Olivier-Bourbigou, Hélène;  Institut Français du Pétrol - IFP
Magna, Lionel;  Institut Français du Pétrol - IFP
Gilbert, Bernard ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
About the Acidity Level in Room Temperature Ionic Liquids
Publication date :
2007
Event name :
15th International Symposium on Molten Salt
Event organizer :
Paul C. Trulove, Robert A. Mantz, Hugh C. De Long
Event place :
Cancun, Mexico
Event date :
October 29 - November 3, 2006
By request :
Yes
Audience :
International
Journal title :
ECS Transactions
ISSN :
1938-5862
eISSN :
1938-6737
Publisher :
The Electrochemical Society, Pennington, United States - New Jersey
Volume :
3
Issue :
35
Pages :
71
Peer reviewed :
Peer reviewed
Funders :
IFP - Institut Français du Pétrole [FR]
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