A Comparison of the Acidity Levels in Room-Temperature Ionic Liquids

Robert, Thierry; Magna, Lionel; Olivier-Bourbigou, Hélène; Gilbert, Bernard

doi:10.1149/1.3169857

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Article (Scientific journals)

A Comparison of the Acidity Levels in Room-Temperature Ionic Liquids

Robert, Thierry; Magna, Lionel; Olivier-Bourbigou, Hélène et al.

2009 • In Journal of the Electrochemical Society, 156 (9), p. 115

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10.1149/1.3169857

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Keywords :

ionic liquids; bronsted acidity; Hammett function

Abstract :

[en] The Broensted acidity level was evaluated for several ionic liqs. ([BMIm][BF4], [BMIm][PF6], [BMIm][SbF6], [BMIm][OTf], [BMIm][NTf2], [HNET3][NTf2], and [HBIm][NTf2]) to which a strong acid, such as HNTf2 [NTf2=N(CF3SO2)2] and HOTf (OTf=CF3SO3), has been added. The main purpose is to tentatively measure the influence on the resulting acidity of (i) the solvent anion or cation structure and (ii) the added acid nature. The evaluation method is based on the detn. of the Hammett acidity functions H0 using UV/visible spectroscopy. The acidity of protons is mainly detd. by their solvation state, and consequently, the properties of protons depend on both the nature of the solvent and the nature and concn. of the acid. In practice, for the investigated ionic liqs., 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 dissocg. character of the ionic liq. are addressed.

Disciplines :

Chemistry

Author, co-author :

Robert, Thierry ; Université de Liège - ULiège > Département de chimie (sciences) > Chimie analytique et électrochimie

Magna, Lionel; Institut Francais du Petrole - 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 :

A Comparison of the Acidity Levels in Room-Temperature Ionic Liquids

Publication date :

2009

Journal title :

Journal of the Electrochemical Society

ISSN :

0013-4651

eISSN :

1945-7111

Publisher :

Electrochemical Society

Volume :

156

Issue :

Pages :

115

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

IFP - Institut Français du Pétrole

Available on ORBi :

since 01 December 2010

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