Abstract
The Zeeman effect of the 81Br NQR line was studied on single crystals of 4,4′-dibromodiphenylether and 4,4′-dibromodiphenylthioether. The relative orientations of the electric-field-gradient tensors acting upon the Br nuclei in the same molecule have been determined. The angle between the two Z-axis directions is 129°0′ ± 5′ in the former compound and 107°15′ ± 4′ in the latter. The angle between the normal to the plane determined by the two Z axes in a molecule and the X axis of each gradient is 33°30′ ± 1° and 37°25′ ± 30′, respectively. These values are in general agreement with known data from x-ray diffraction although the differences are significant. An accurate comparison is not, however, possible since carbon-atom coordinates are not reported in the literature.
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