Molecular dynamics were studied by using 35Cl nuclear quadrupole resonance techniques. The spin-lattice relaxation time, the quadrupole resonance frequency, the line-width and the integrated intensity of the resonance line multiplied by the temperature, were measured at 12.4 to 425K. Effects due to cation and anion mobility were detected and their contributions were deconvoluted. A domain structure and a diverse mobility of ammonium ions in the ordered phase were assumed when fitting the experimental data. An order–disorder phase transition occurred at 148K, and this was reflected in all of the measured quantities. An unrestricted mobility of ammonium ions predominated above the phase transition. At higher temperatures, mobility of the planar PtCl42− ions (first torsional oscillations and then reorientational jumps) became detectable.

35Cl Nuclear Quadrupole Resonance (NQR) Study of Ion Mobility in (ND4)2PtCl4. A.Birczyński, C.Dimitropoulos, Z.T.Lalowicz: Physica B, 2003, 339[4], 182-92