81 Br N.q.r. spectroscopy has revealed a drastic structural change in the (C5H5NH)SbBr4 crystal; above 253 K the SbBr4– anion has the trigonal bipyramid structure, whereas below 253K the axial bonds become asymmetric and the SbBr4– anion is more reasonably described as SbBr3·Br– at 77 K.
T. Okuda, K. Yamada, H. Ishihara, M. Hiura, S. Gima and H. Negita, J. Chem. Soc., Chem. Commun., 1981, 979 DOI: 10.1039/C39810000979
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