17O-enriched complexes between oxydiacetate ligand and several diamagnetic and paramagnetic lanthanide(III) metal ions (Ln) were investigated by solution-state 17O NMR spectroscopy. The bound-state signals of chelating (O in) and nonchelating (O out) oxygen atoms of the carboxylate groups were observed for all the samples investigated. The data indicate that the 17O line width is dominated by contributions from both quadrupole relaxation and chemical exchange in the case of Pr and Nd complexes. Dissection of the chemical shift induced by metal ions on O in into Fermi contact and pseudocontact contributions was performed, and the hyperfine coupling constant (A/ℏ) was estimated. No evidence of structural changes within the series was detected.
Empreinte digitaleExaminer les sujets de recherche de « An 17O NMR Study of Diamagnetic and Paramagnetic Lanthanide-tris(oxydiacetate) Complexes in Aqueous Solution ». Ensemble, ils forment une empreinte digitale unique.
Plateforme technologique Caracterisation physico-chimiques
Equipement/installations: Plateforme technolgique