Coordination abilities of Good's buffer ionic liquids toward europium(III) ion in aqueous solution
authors Taha, M; Khan, I; Coutinho, JAP
nationality International
journal JOURNAL OF CHEMICAL THERMODYNAMICS
author keywords Good's buffers ionic liquids; Eu(III) complexes; Tricine; Protonation constants; Stability constants
keywords RARE-EARTH IONS; STABILITY-CONSTANTS; AMINO-ACIDS; EQUILIBRIUM-CONSTANTS; BIOLOGICAL-RESEARCH; COMPLEX-FORMATION; GLASS-ELECTRODE; CATION-EXCHANGE; METAL-COMPLEXES; EXTRACTION
abstract Good's buffer ionic liquids (GB-ILs) are new class of ILs with self-buffering capacity at the physiological pH range for biological research. GB-ILs are formed by the combination of Good's buffers as anions and various organic bases as counter ions. In this work, the complexation of europium(III) ion with tricine and tricine-based GB-ILs, tetramethylammonium tricinate, tetraethylammonium tricinate, tetrabutylammonium tricinate, cholinium tricinate, and 1-ethyl-3-methylimidazolium tricinate in aqueous solution were determined potentiometrically at T = 298.2 K and ionic strength I = 0.1 mol.dm (3) NaNO3. The protonation constants of the studied ligands (L) and their overall stability constants (lg beta) with Eu(III) were determined. The best model that fit the potentiometric data was consisted of six main species, EuL2+, EuL2+, EuL3, EuH-1L+, EuH-2L2- , and EuH-3L33-. The lg beta(Eu(tricine)), lg beta(Eu(tricine)2), and lg beta(Eu(tricine)3) are 5.75, 9.51, and 12.79, respectively. The overall stability constants (lgb) of tricine-based GB-ILs were found to be greater than those of tricine. The species distribution diagrams of these complexes were calculated and discussed in terms of percent Eu(III) and pH. We present a density functional theory (DFT) study to understand tricine chelating to Eu(III). (C) 2015 Elsevier Ltd. All rights reserved.
publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
issn 0021-9614
year published 2016
volume 94
beginning page 152
ending page 159
digital object identifier (doi) 10.1016/j.jct.2015.11.003
web of science category Thermodynamics; Chemistry, Physical
subject category Thermodynamics; Chemistry
unique article identifier WOS:000366850200018
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