Abstract
The spin-lattice relaxation mechanisms for aqueous and dimethyl sulfoxide solutions of Y(NO 3) 3 have been found to be mainly spin-rotation and dipolar relaxation with solvent protons, unlike most heavy spin = 1 2 metal ions which are relaxed mainly by spin-rotation and chemical shift anisotropy. The theoretical maximum 89Y{ 1H} NOEF value of -10.2 was observed when τ c for the ion was lengthened by lowering the temperature of the aqueous salt solution to 5°C, or when yttrium was complexed to an organic ligand. Since 89Y has a sensitivity of 0.67 relative to that of 13C, the relative importance of dipolar relaxation and the large theoretical maximum NOEF make 89Y a possible valuable NOE structure probe. Such studies can complement relaxation and shift data obtained from other diamagnetic and paramagnetic lanthanide ions.
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