Alternative probe for the determination of the hydrogen-bond acidity of ionic liquids and their aqueous solutions
authors Madeira, PP; Passos, H; Gomes, J; Coutinho, JAP; Freire, MG
nationality International
journal PHYSICAL CHEMISTRY CHEMICAL PHYSICS
keywords SOLVATOCHROMIC COMPARISON METHOD; PYRIDINE-N-OXIDE; BIPHASIC SYSTEMS; EXTENDED SCALE; PI-STAR; SOLVENTS; EXTRACTION; PARAMETERS; BEHAVIOR; POLARITY
abstract Although highly relevant to a priori select adequate solvents for a given application, the determination of the hydrogen-bond acidity or proton donor ability of aqueous solutions of ionic liquids is a difficult task due to the poor solubility of the commonly used probes in aqueous media. In this work, we demonstrate the applicability of the pyridine-N-oxide probe to determine the hydrogen-bond acidity of both neat ionic liquids and their aqueous solutions, based on C-13 NMR chemical shifts, and the suitability of these values to appraise the ability of ionic liquids to form aqueous two-phase systems.
publisher ROYAL SOC CHEMISTRY
issn 1463-9076
year published 2017
volume 19
issue 18
beginning page 11011
ending page 11016
digital object identifier (doi) 10.1039/c6cp08210f
web of science category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category Chemistry; Physics
unique article identifier WOS:000401022300005
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journal analysis (jcr 2017):
journal impact factor 3.906
5 year journal impact factor 4.224
category normalized journal impact factor percentile 73.037
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