Abstract
7Li NMR spectroscopy was used to determine the stoichiometry and stability of the Li + ion complex with tetraethyleneglycol-bis(8-quinolyl) ether ( L) in acetonitrile–dimethylsulfoxide (97.2:2.8, w/w) and nitromethane–dimethylsulfoxide (97.2:2.8, w/w) binary mixtures. A competitive 7Li NMR spectroscopy was also employed to probe the complexation of Na +, Ag +, Ca 2+, Mg 2+, Zn 2+, Cd 2+, Pb 2+ and UO 2 2+ ions with L in the same solvent systems. The 7Li chemical shift data indicated that all studied cations form 1:1 complexes with the ligand and all the resulting 1:1 complexes in nitromethane–dimethylsulfoxide are more stable than those in acetonitrile–dimethylsulfoxide solution. In both solvent systems, the stability of the resulting complexes was found to vary in the order Ag + > Pb 2+ > Na + > Cd 2+ > Zn 2+ > Li + > Ca 2+ > UO 2 2+ > Mg 2 +.
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