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Published on: November 30, 2022
Oligo(borolyl)benzenes--synthesis and properties.
Holger Braunschweig1, Ching-Wen Chiu, Alexander Damme
1Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. h.braunschweig@uni-wuerzburg.de
Researchers synthesized novel boroles linked by a conjugated phenylene spacer. Their coordination chemistry with pyridines and electronic properties were investigated, revealing unique charge-transfer effects and Lewis acidity influenced by conjugation.
Area of Science:
- Organoboron Chemistry
- Supramolecular Chemistry
- Materials Science
Background:
- Boroles are versatile organoboron compounds with unique electronic properties.
- Conjugated spacers can significantly influence the behavior of molecular systems.
- Understanding Lewis acidity and coordination is crucial for designing new functional materials.
Purpose of the Study:
- To synthesize and characterize novel boroles linked by a conjugated phenylene spacer.
- To investigate the coordination behavior of these oligoboroles with various pyridine derivatives.
- To explore the electronic properties and Lewis acidity of conjugated borole systems.
Main Methods:
- Synthesis of conjugated oligoboroles.
- Characterization using NMR, UV/Vis spectroscopy, and X-ray crystal diffraction.
- Coordination studies with pyridine derivatives.
- Density Functional Theory (DFT) calculations.
- Chemical reduction and base transfer reactions.
Main Results:
- Successful synthesis and characterization of phenylene-linked boroles.
- Observed distinct coordination behaviors with different pyridines.
- DFT calculations confirmed charge-transfer effects in pyridine-4-carbonitrile adducts.
- Isolation of a hexaanion via two-electron reduction of a tris(borolyl)benzene derivative.
- Evidence for electronic interaction and potential Lewis acidity modulation through the aryl spacer.
Conclusions:
- The phenylene spacer facilitates electronic communication between borole units.
- Oligoboroles exhibit tunable coordination properties based on pyridine substituents.
- Conjugation influences Lewis acidity and enables unique redox behavior, opening avenues for new organoboron materials.
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