Licensed Unlicensed Requires Authentication Published by De Gruyter May 31, 2021

Salts of octabismuth(2+) polycations crystallized from Lewis-acidic ionic liquids

Maximilian Knies and Michael Ruck
From the journal Zeitschrift für Naturforschung B
https://doi.org/10.1515/znb-2021-0042

Abstract

The reaction of Bi and BiCl3 with RbCl or CsCl in the Lewis-acidic ionic liquid (IL) [BMIm]Cl·4AlCl3 at T = 200 °C yielded air-sensitive, shiny black crystals. X-ray diffraction on single crystals revealed the hexagonal structures of two new salts (Bi8)M[AlCl4]3 (M = Rb, Cs), which are isostructural to the high-temperature form of (Bi8)Tl[AlCl4]3. The known (Bi8)2+ polycation is a square antiprism and can be interpreted as an arachno cluster following modified Wade rules. The crystal structure is a complex variant of the hexagonal perovskite structure type ABX 3 with A = (Bi8)2+, B = M + and X = [AlCl4]–. Chiral strands ∞ { M [ AlCl 4 ] 3 } 2 − ∞ 1 (M = Rb, Cs) run along [001]. The (Bi8)2+ polycations are only weakly coordinated inside a cage of 24 chloride ions and show dynamic rotational disorder at room temperature. Upon slow cooling to 170 K, the reorientation of the clusters was frozen, yet no long-range order was established.

Keywords: bismuth polycations; crystal structure; ionic liquids
Corresponding author: Michael Ruck, Fakultät Chemie und Lebensmittelchemie, Technische Universität Dresden, 01062 Dresden, Germany; and Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany, E-mail: . https://tu-dresden.de/mn/chemie/ac/ac2/

Funding source: Deutsche Forschungsgemeinschaft

Acknowledgment

We acknowledge technical support by M. Münch and A. Brünner (TU Dresden).

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: This research was funded by the Deutsche Forschungsgemeinschaft (DFG) within the Priority Program SPP 1708.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Supplementary Material

The online version of this article offers supplementary material (https://doi.org/10.1515/znb-2021-0042).
Received: 2021-03-26
Accepted: 2021-05-12
Published Online: 2021-05-31
Published in Print: 2021-11-25

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From the journal
Zeitschrift für Naturforschung B
Zeitschrift für Naturforschung B
Volume 76 Issue 10-12

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