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 (lgb) with Eu(III) were determined. The best model that fit the potentiometric data was consisted of six main species, EuL2p, EuLp 2 , EuL3, EuH 1Lp, EuH 2L 2 , and EuH 3L3 3 . The lgbEuotricineP, lgbEuotricineP 2 , and lgbEuotricineP 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).
Compounds
#
Formula
Name
1
C10H24N2O5
tetramethylammonium tricine
2
C14H32N2O5
tetraethylammonium tricine
3
C22H48N2O5
tetrabutylammonium tricine
4
C11H26N2O6
choline tricine
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.