Oxygen-17 NMR study of the uranyl ion. IV 17O nuclear magnetic relaxation and chemical shifts of uranyl oxygen atoms and coordinated water.
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<SUP>17</SUP>O nuclear magnetic relaxation times and chemical shifts of uranyl oxygen atoms (hereafter uranyl oxygens) and solvent water have been measured with changing concentration of the uranyl ion in aqueous solution. The <SUP>17</SUP>O resonance of the water molecule in the first-coordination sphere is determined to be at 90.1±1.2 ppm relative to free water at 25 °C. The effective correlation time for the <SUP>17</SUP>O quadrupolar relaxation of the coordinated water, which corresponds to the reorientation time for the hydrated uranyl ion, is about 8.7 times that of free water. The <SUP>17</SUP>O spin-lattice relaxation times (<I>T</I><SUB>1</SUB>) of uranyl oxygens have been measured at 25 °C. From the <SUP>17</SUP>O <I>T</I><SUB>1</SUB> values the <SUP>17</SUP>O nuclear quadrupole coupling constant of uranyl oxygens has been estimated to be 0.44 MHz. This small value implies the high symmetry of electron distribution around uranyl oxygens.
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