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The temperature dependences of  2 H and  195 Pt NMR spectra and the spin-lattice relaxation time T 1  were measured for [Cu(H 2 O) 6 ][PtCl 6 ]. From the simulation of  2 H NMR spectra, the jump rate of 180° flips of the water molecules (k), the nuclear quadrupole interaction parameters (e 2 Qq/h, ƞ) and the electron-nucleon dipolar interaction parameter (v D ) were obtained. By measuring  2 H T 1 , k was estimated in the temperature range where the spectrum is insensitive to the motion of the water molecules. Above the phase transition temperature, the pre-exponential factor k 0  = 8 x10 11  s -1  and the activation energy E a  = 15 kJmol -1  for 180° flips of the water molecules were obtained from the spectral simulation and T 1 .  195 Pt NMR spectra showed an axially symmetric and unsymmetric powder pattern of the chemical shift anisotropy at the high and low temperature phase, respectively. For the deuterated compound, the correlation times of the electron spin in Cu 2+  were estimated from  195 Pt T 1  and the activation energy for jumping between the different configurations of Jahn-Teller distortion Δ = 200 K was obtained.

2 H and 195 Pt NMR Studies of Molecular and Electron Spin Dynamics in Paramagnetic [Cu(H 2 O) 6 ][PtCl 6 ]