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The temperature dependences of the  35 Cl NQR frequency (ν), spin-lattice relaxation time (T 1 ), and spin-spin relaxation time (T 2 ) have been studied in 2,4,6-trinitrochlorobenzene (picryl chloride) from 77 K up to the melting point (354 K). The T 1 (T) curve exhibits a pronounced composite mimimum near 300 K which gives evidence for the reorientations of the two ortho-NO 2  groups around their two-fold symmetry axes with the activation energies of 27.4 kJ mol  - 1  and 31.2 kJ mol  - 1 . These values can be related to the ortho-NO 2  groups having the twist angles of 33° and 81°, respectively (the crystal structure of picryl chloride is known). The T 2 (T) dependence exhibits interesting features, too: a deep minimum about 140 K and a new rapid decrease above 270 K.

35 Cl NQR Study of Thermoactivated Motions of Nitro Groups in Picryl Chloride