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The temperature dependences of the  35 Cl NQR frequencies v Q  and the nuclear quadrupole spin-lattice relaxation times T 1Q  in 2,6-lutidinium hexachlorotellurate (IV) was observed at various temperatures between 80 and 343 K. This crystal undergoes a phase transition at T c  = 229 K. A single and three pairs of  35 Cl NQR frequencies were observed above and below T c  , respectively. The hysteresis of the phase transition and a discontinuity in the temperature dependence of the resonance frequencies at T c  indicate that this phase transition is of first order. Although the resonance frequencies of the pairs in the low temperature phase are very close to one another, T 1Q  and below T c  could be accurately determined by measuring the Fourier transform spectra of each line. Above ca. 250 K, T 1Q  showed an exponential decrease which is attributable to the overall reorientational motion of [TeCl 6 ] 2-  with an activation energy of 82 kJ mol -1

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Temperature Dependences of NQR Frequencies and Nuclear Quadrupole Relaxation Times of Chlorine in 2,6-Lutidinium Hexachlorotellurate (IV) as Studied by Pulsed NQR Techniques