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A thorough characterization of the {\gamma}, {\beta} and glass phases ofdeuterated 1,1,2,2 Tetrachloroethane (C2D2Cl4) via Nuclear Quadrupole Resonanceand Molecular Dynamic Simulations (MDS) is reported. The presence of molecularreorientations was experimentally observed in the glass phase and in the{\beta} phase. In the {\beta} phase, and from MDS, these reorientations areattributed to two possible movements, i.e. a $180^o$ reorientation around theC2 molecular symmetry axis and a reorientation of the molecule betweennon-equivalent positions. In the glass phase, the spin-lattice relaxation timeT1 is of the order of 16 times lower that T1 in the crystalline phase andvaries as $T^{-1}$ below 100 K in good agreement with the strong quadrupolarrelaxation observed in amorphous materials and in the glassy state of molecularorganic systems. The activation energy of molecular reorientations in the glassphase (19 kJ/mol) is comparable to that observed in the glassy crystal of a"molecular cousin" compound, Freon 112 (C2F2Cl4), for the secondary{\beta}-relaxation. Moreover, the on-site orientational motion ofTetrachloroethane molecules offers a new indirect evidence of the prominentrole of such orientational disorder in glassy dynamics.

Dynamic characterization of crystalline and glass phases of deuterated 1,1,2,2 Tetrachloroethane