(IUCr) Crystallography Journals Online

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Acta Cryst. (2002). E58, m159-m161 [ doi:10.1107/S1600536802005093 ]

Hexakis(antipyrine-O)terbium(III) triiodide at 160 K: confirmation of a centrosymmetric structure for a brilliantly triboluminescent complex

W. Clegg, G. Bourhill and I. Sage

Abstract: The title complex, [Tb(C₁₁H₁₂N₂O)₆]I₃, has essentially the same structure at 160 K as at room temperature, and is clearly centrosymmetric without any disorder, contrary to some proposals regarding the possible mechanism of triboluminescence. Terbium has an octahedral coordination and lies in a position of $\overline 3$ symmetry, with all six antipyrine ligands crystallographically equivalent. One iodide anion lies in a special position of site symmetry $\overline 3$ , and another is on a threefold rotation axis, to give three iodide anions per terbium-centred complex cation.

Online 28 March 2002