The Subbromide Bi5Br4 – On the Existence of a Hidden Phase

Pabst F, Chang JH, Finzel K, Kohout M, Schmidt P, Ruck M (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Zeitschrift für Anorganische und Allgemeine Chemie Wiley

DOI: 10.1002/zaac.201800149

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.

Involved external institutions

Technische Universität Dresden DE Germany (DE) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Brandenburgische Technische Universität Cottbus-Senftenberg (BTU) DE Germany (DE)

How to cite

APA:

Pabst, F., Chang, J.-H., Finzel, K., Kohout, M., Schmidt, P., & Ruck, M. (2019). The Subbromide Bi5Br4 – On the Existence of a Hidden Phase. Zeitschrift für Anorganische und Allgemeine Chemie. https://doi.org/10.1002/zaac.201800149

MLA:

Pabst, Falk, et al. "The Subbromide Bi5Br4 – On the Existence of a Hidden Phase." Zeitschrift für Anorganische und Allgemeine Chemie (2019).

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