An NQR study of the thermally activated motion of nitro groups in 3-nitrobenzene sulphonyl chloride
S C Perez; M Krupski; R L Armstrong; A H Brunetti; S C Perez; Dept. of Phys., New Brunswick Univ., Fredericton, NB, Canada; M Krupski; Dept. of Phys., New Brunswick Univ., Fredericton, NB, Canada; R L Armstrong; Dept. of Phys., New Brunswick Univ., Fredericton, NB, Canada; A H Brunetti; Dept. of Phys., New Brunswick Univ., Fredericton, NB, Canada
Журнал:
Journal of Physics: Condensed Matter
Дата:
1994-07-25
Аннотация:
A study of the temperature dependence of the <sup>35</sup>Cl NQR frequency and linewidth, and the <sup>35</sup>Cl and <sup>37</sup>Cl spin-lattice relaxation times, in 3-nitrobenzene sulphonyl chloride (3:NO<sub>2</sub>- phi -SO<sub>2</sub>Cl) is reported. The pressure dependence of the <sup>35</sup>Cl frequency is also reported. The latter measurements indicate the existence of a first-order phase transition induced by pressure. It is shown that all the results are consistent with the onset of reorientations of NO<sub>2</sub> groups. The parameters deduced, including the activation energy, are compared with those obtained from previous studies of 2:NO<sub>2</sub>- phi -SO<sub>2</sub>Cl and 4:NO<sub>2</sub>- phi -SO<sub>2</sub>Cl.
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