ORBi: Malherbe Cédric - Tentative determination of the acidity level in room temperature ionic liquids by electrochemical methods

Reference : Tentative determination of the acidity level in room temperature ionic liquids by electr...


	Document type :	Scientific congresses and symposiums : Paper published in a journal
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Chemistry
	To cite this reference:	http://hdl.handle.net/2268/78452

Title :	Tentative determination of the acidity level in room temperature ionic liquids by electrochemical methods
Language :	English
Author, co-author :	Malherbe, Cédric [Université de Liège - ULg > Département de chimie (sciences) > Chimie analytique et électrochimie >]
	Robert, Thierry [Université de Liège - ULg > 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 - ULg > Département de chimie (sciences) > Département de chimie (sciences) >]
Publication date :	2009
Journal title :	ECS Transactions
Publisher :	The Electrochemical Society
Volume :	16
Issue/season :	49
Pages :	3
On invitation :	Yes
Audience :	International
ISSN :	1938-5862
e-ISSN :	1938-6737
City :	Pennington
Event name :	214th Meeting of ECS — The Electrochemical Society
Event date :	october 2008
Event place (city) :	Honolulu
Event country :	Hawaii
Keywords :	[en] 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.
Funders :	Institut Français du Pétrol - IFP
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/78452

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