W. Pies, A. Weiss
1980
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0
Influential Citations
3
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract Three modifications of 3, 4 , 5-trichloroaniline, 3, 4 , 5-C 3 C 6 H 2 NH 2 , are found in the temperature range 77 ⩽ T/K ⩽ T melt = 373K. The high temperature phase H, metastable at room temperature, is characterized by a two-line 35 Cl-NQR spectrum indicating the crystallographic equivalence of the two meta-Cl-atoms. This equivalence is not retained in the room temperature phase T and in a third, possibly metastable low temperature phase TT. The 35 Cl-NQR spectra of all three modifications are given at T = 77K and at room temperature. The temperature dependence of the frequencies is described, especially in the region of the phase transition T→H. A phase transformation scheme is presented.