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Updated: Aug 7, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Bismuth Cations: Fluoride Ion Abstraction, Isocyanide Coordination, and Impact of Steric Bulk on Lewis Acidity
Tobias Dunaj1, Johannes Schwarzmann1, Jacqueline Ramler1
1Fachbereich Chemie, Philipps Universität Marburg, Hans-Meerwein-Straße 4, 35043, Marburg, Germany.
Abstract:
The molecular compound [BiDipp2 (SbF6 )], containing the bulky, donor-free bismuth cation [BiDipp2 ]+ has been synthesized and fully characterized (Dipp=2,6-iPr2 -C6 H3 ). Using its methyl analog [BiMe2 (SbF6 )] as a second reference point, the impact of steric bulk on bismuth-based Lewis acidity was investigated in a combined experimental (Gutmann-Beckett and modified Gutmann-Beckett methods) and theoretical approach (DFT calculations). Reactivity studies of the bismuth cations towards [PF6 ]- and neutral Lewis bases such as isocyanides C≡NR' revealed facile fluoride ion abstraction and straightforward Lewis pair formation, respectively. The first examples of compounds featuring bismuth-bound isocyanides have been isolated and fully characterized.
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