Document Detail

Electrochemical Determination of pKa of N-Bases in Ionic Liquid Media.
MedLine Citation:
PMID:  22050284     Owner:  NLM     Status:  Publisher    
Two electrochemical techniques have been used to measure the pKa of N-bases in several ionic liquids. The first method corresponds to a potentiometric titration of a strong acid with the N-base using a platinised Pt indicator electrode immersed in the IL solution and maintained under dihydrogen atmosphere via gas bubbling. The second approach involves performing cyclic voltammetry at a platinised Pt electrode in a solution containing both strong acid and the conjugate weak acid of the N-base. Values of pKa obtained by one or the other approach are in good agreement with each other. The experimental data clearly demonstrated that acid/base chemistry in ILs is similar to that observed in molecular non-aqueous solvents i.e. the relative strengths of the bases were in the right order and spaced (ΔpKa). It was also observed that the strength of N-bases is highly dependent on the anion of the ionic liquid; this observation indicates that pH-dependent reactions could be controlled by appropriate choice of anion for bulk ILs or as an added co-ion to bulk IL.
Rachid Barhdadi; Michel Troupel; Clement Comminges; Michel Laurent; Andrew Patrick Doherty
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-3
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  -     ISSN:  1520-5207     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-4     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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