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• W2034228873 startingPage "8717" @default.
• W2034228873 abstract "The complexes between the polyaminocarboxylate DOTA ligand and the whole series of stable lanthanide(III) metal ions, except Gd3+, were studied in aqueous solution by 17O NMR. For all of the paramagnetic systems, the 17O NMR signals of both the nonchelating (O1) and chelating (O2) oxygen atoms could be detected, and for some of them, the signals of both the SAP and TSAP (TSAP′) conformational isomers were also observed. Line width data analysis reveals that signal broadening is not dominated by paramagnetic relaxation enhancement, as it was believed to be. The data indicate that quadrupole relaxation and, for some complexes, chemical exchange between the SAP and TSAP isomers are the major contributions to the 17O NMR line width at 25 °C. Besides, the Fermi contact and pseudocontact contributions to the observed lanthanide-induced shifts could be extracted. The 17O hyperfine coupling constants determined for O2 in the SAP and TSAP isomers are similar to each other and to the values reported for several Gd(III) complexes comprising fast-exchanging ligands. Interestingly, the results suggest that 17O NMR should prove to be useful for the study of highly paramagnetic Gd(III) complexes of nonlabile ligands." @default.
• W2034228873 created "2016-06-24" @default.
• W2034228873 creator A5021036747 @default.
• W2034228873 creator A5072578982 @default.
• W2034228873 date "2014-08-04" @default.
• W2034228873 modified "2023-09-27" @default.
• W2034228873 title "¹⁷O NMR Study of Diamagnetic and Paramagnetic Lanthanide(III)–DOTA Complexes in Aqueous Solution" @default.
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• W2034228873 doi "https://doi.org/10.1021/ic501324r" @default.
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