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- W1971687809 abstract "The temperature dependences of the 2H nuclear magnetic resonance (NMR) spectra and the spin-lattice relaxation time T1 were measured for [Ni(H2O)6][SiF6] and [Fe(H2O)6][SiF6]. The motional modes for both compounds were discussed on the basis of the spectral simulation. The temperature variations of the 2H NMR spectra at high temperatures could be explained by three-site jumps of [Ni(H2O)6]2+ about the C3 axis for [Ni(H2O)6][SiF6]. For [Fe(H2O)6][SiF6], however, six-site jumps of [Fe(H2O)6]2+ about the C3 axis were found to be most probable form of motion at high temperatures. At low temperatures, the 2H NMR spectra of both compounds could be explained by 180° flips of the water molecule. The 2H NMR T1 was dominated by the fluctuations of the electric field gradient caused by the molecular motion and of the magnetic interaction between the 2H nucleus and the unpaired electron spin in the metal ion. T1 was analysed in terms of the motional modes predicted from the spectral simulation. The activation energies, the jumping rates at infinite temperature for each form of motion and the quadrupole interaction parameters (e2Qq/h,η) were obtained from the 2H NMR spectra and T1. The conclusions from the spectral simulation are in good agreement with the results for T1. These results suggest that [Fe(H2O)6][SiF6] possesses dynamic disorder structure in the high-temperature phase." @default.
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- W1971687809 date "2000-07-25" @default.
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- W1971687809 title "Dynamical structure of paramagnetic [M(H<sub>2</sub>O)<sub>6</sub>][SiF<sub>6</sub>] (M = Fe<sup>2+</sup>,Ni<sup>2+</sup>) crystal studied by means of<sup>2</sup>H nuclear magnetic resonance" @default.
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- W1971687809 doi "https://doi.org/10.1088/0953-8984/12/32/310" @default.
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