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The temperature dependences of  35 Cl NQR frequencies,  35 Cl ( 37 Cl) nuclear quadrupolar relaxation times (T 1ClQ ),  1 H NMR absorption, and of  1 H NMR relaxation times were observed for p-chlorobenzamide, p-ClC 6 H 4 CONH 2  and its N-deuterated analog. The existence of three  35 Cl NQR lines already reported was confirmed for the known low temperature phase below 316 K. A single sharp  35 Cl NQR line was detected in the high temperature phase up to 447 K just below the melting point 451 K. At lower temperatures, three different  35 Cl T 1ClQ  values attributable to the fluctuation of the electric field gradient due to rotational oscillation were observed. With increasing temperature, these T 1ClQ  decreased rapidly and yielded almost the same value immediately below T tr  suggesting the onset of a slow motion. The  1 H T 1 , of the high temperature phase gave a T 1 , minim um and could be explained through the 180° flip motion of the phenyl ring with an activation energy o f 44 kJ mol -1 .

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Structural Phase Transition and Molecular Motion of p-Chlorobenzamide as Studied by the Temperature Variations of  35 Cl NQR Frequencies, Chlorine Nuclear Quadrupolar Relaxation Times, and  1 H Magnetic Dipolar Relaxation Times