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Title: Eu3+ as a dual probe for the determination of IL anion donor power: A combined luminescence spectroscopic and electrochemical approach

This work is aimed at giving proof that Eu(Tf2N)(3) (Tf2N = bis(trifluoromethanesulfonyl)amide) can act as both an optical and electrochemical probe for the determination of the Lewis acidity of an ionic liquid anion. For that reason the luminescence spectra and cyclic voltammograms of dilute solutions of Eu(Tf2N)(3) in various ionic liquids were investigated. The Eu2+/3+ redox potential in the investigated ILs can be related to the Lewis basicity of the IL anion. The IL cation had little influence. The lower the determined halfwave potential, the higher the IL anion basicity. The obtained ranking can be confirmed by luminescence spectroscopy where a bathochromic shift of the D-5(0) -> F-7(4) transition indicates a stronger Lewis basicity of the IL anion. (C) 2014 Published by Elsevier B.V.
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Publication Date:
OSTI Identifier:
Report Number(s):
IS-J 8335
Journal ID: ISSN 0167-7322
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Molecular Liquids; Journal Volume: 192
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
36 MATERIALS SCIENCE; acidity, betaine dyes, catalysis, complexes, Electrochemistry, Europium, indicators, ionic liquids, optical-properties, RARE-EARTH ELEMENTS, solvatochromism, solvent polarity, weakly-coordinating anions