Table of Contents
Inorganics, Volume 7, Issue 4 (April 2019)
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Cover Story (view full-size image) The cover shows sections of the X-ray diffraction pattern and the crystal structure of the [...] Read more. The cover shows sections of the X-ray diffraction pattern and the crystal structure of the low-temperature form of the new bismuth-cluster compound (Bi8)Tl[AlCl4]3. This metal-rich salt was synthesized from bismuth, BiCl3 and TlCl under Lewis-acidic ionothermal conditions in an ionic liquid. The basic motif of the structure is a hexagonal perovskite, including Bi82+ polycations and [AlCl4]– anions. At room temperature, the Bi82+ square-antiprisms show dynamic rotational disorder, i.e. flipping between different energetically equivalent orientations. The one-dimensional strands, which are formed by [AlCl4]– tetrahedra and icosahedrally coordinated Tl+ cations, remain widely unaffected. Slow cooling results in a long-range ordered superstructure with lower symmetry and a larger unit cell. View Paper here.