The spin-lattice relaxation times (
T1) of D and
17O nuclei of coordinated heavy water (D
2O) molecules for Na
+ and K
+ in sodium bromide and potassium bromide dilute aqueous solutions were measured in the range of 5-50°C by means of NMR. The spin-lattice relaxation rates (
R1=1/
T1) varied linearly with the concentration up to 1mol/kg at a given temperature. The parallel (D) and the perpendicular (
17O) rotational correlation times of coordinated D
2O molecules for Na
+ and K
+ were determined. The ratio τ(D)/τ(
17O) of the rotational correlation times of the coordinated D
2O molecules was larger and smaller than unity for Na
+ and K
+, respectively, and was practically independent of temperature, which indicated that the rotational anisotropies of the coordinated D
2O molecules was almost temperature independent.
抄録全体を表示