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The Subbromide Bi5Br4 – On the Existence of a Hidden Phase

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Kohout,  Miroslav
Miroslav Kohout, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ruck,  Michael
Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Pabst, F., Chang, J.-H., Finzel, K., Kohout, M., Schmidt, P., & Ruck, M. (2020). The Subbromide Bi5Br4 – On the Existence of a Hidden Phase. Zeitschrift für anorganische und allgemeine Chemie, 646(3), 149-155. doi:10.1002/zaac.201800149.


Cite as: http://hdl.handle.net/21.11116/0000-0005-4FDE-A
Abstract
Black and irregularly shaped crystals of the bismuth-rich bromide Bi5Br4 were obtained as a by-product of the reaction of CsBr, Bi, and BiBr3. X-ray diffraction on a single-crystal revealed its orthorhombic structure with the space group Pmmn (no. 59) and lattice parameters a = 1800.0(2) pm, b = 1476.1(1) pm, and c = 924.5(2) pm at 296 K. The structure is composed of Bi8 2+ and Bi9 5+ polycations and bromidobismuthate(III) anions according to the structured formula Bi5Br4 = Bi20Br16 = Bi8 2+Bi9 5+[BiBr5]2–[Bi2Br11]5–. Bi5Br4 is the bismuth-richest among the bismuth subhalides containing isolated polycations. Extensive differential scanning calorimetry studies indicate that Bi5Br4 decomposes at 262 °C, i.e. one degree below the bismuth-rich eutectic at 263 °C. All attempts towards a rational synthesis yielded predominantly the neighboring phases BiBr and Bi6Br7. © 2019 The Authors published by Wiley-VCH Verlag GmbH Co. KGaA, Weinheim