Abstract
The spin-lattice relaxation times (T 1) of D and 17O nuclei of coordinated D 2O molecules in n-ROH (R= Me, Et, Pr and Bu) dilute aqueous solutions in the concentration range of 0.2 and 1.0 mol kg −1( 0.004 - 0.02 molar fraction ) at 25°C were measured by NMR spectroscopy. The relaxation rates (R 1=1/T 1) of D and 17O nuclei increased linearly with the concentration. B 1(i=D or 17O) is defined by R 1=R 1 0(1 + B 1 m), where R 1 and R 1 0 are spin-lattice relaxation rates of the D 2O molecule at concentration m (mol kg −1) and that of pure D 2O. B 1 increases with the size of the alkyl group of n-ROH. T 1 in alcohol/water solutions were interpreted with bulk and coordinated water. Positive and molecular size dependent B 1, values are caused by the hydrophobic hydration of the alkyl group. The dynamic hydration number of alcohol solution had good correlation with partial molar volume quantitatively through solute-solvent interactions.
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