Abstract
Abstract 81Br NQR spin-lattice relaxation times for MAl2Br7 (M=Na and K) were measured from 77 to 373 K and the reorientational activation energies of the AlBr3 groups about Al–Br(bridge) axes were determined. In the case of NaAl2Br7, the reorientation of the AlBr3 group was also confirmed by a motional narrowing effect of the 27Al NMR using a single crystal. In order to examine the effect of the reorientation on the Al site, 27Al NQR frequencies in NaAl2Br7 were observed as a function of temperature by a SEDOR technique. The asymmetry parameter (η) of the electric field gradient (efg) tensor was found to increase at one of the two Al sites with the onset of the reorientation.
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