Abstract
81Br NQR was studied in AlBr3 · 2C5H5N, AlBr3 · 1.5CH3CN, and AlBr3 · 2CH3CN. From the NQR spectra it is apparent that the solid compounds are build up by ion pairs [AlBr2(C5H5N )4 +, AlBr4 -], [Al(CH3CN)6 3+, 3AlBr4 -], and [AlBr(CH3CN)5 2+, 2AlBr4 -- CH3CN], respectively. 27Al NQR detected by SEDOR technique supports these structural models. Using these NQR parameters, the metal-ligands interactions in the six-coordinated complexes is discussed on the basis of the donor strength. In the case of AlBr3 ·2CH3CN two types of reorientational motion of the AlBr4 - tetrahedra were detected from the spin lattice relaxation times and from fade-out phenomena of the 81Br NQR signals.
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