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Arene-Fused o-Carboranes via C-B(3) Bond Formation: Synthesis and Properties
Caixia Jia1, Ying Li1, Liang Liu2
1International Phosphorus Laboratory, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
Inorganic Chemistry
|January 6, 2026
Summary
Researchers developed a metal-free method to create novel fused carborane-arene materials. These compounds show enhanced solid-state fluorescence, with potential for advanced luminescent applications.
Area of Science:
- Materials Science
- Organic Chemistry
- Solid-State Chemistry
Background:
- Arene-fused ortho-carboranes are a promising class of solid-state luminescent materials.
- Developing efficient synthetic routes to these compounds is crucial for exploring their properties.
Purpose of the Study:
- To establish a transition-metal-free synthetic strategy for naphthyl- and biphenyl-fused ortho-carboranes.
- To investigate the photophysical properties and structure-property relationships of these novel carborane derivatives.
Main Methods:
- Intramolecular nucleophilic substitution of the B(3)-H bond using in situ generated aryllithium intermediates.
- Single-crystal X-ray diffraction for structural confirmation.
- Photoluminescence spectroscopy and DFT calculations for property analysis.
Main Results:
- Successfully synthesized novel five- and six-membered fused carborane-arene motifs.
- Observed weak solution emission but strong, red-shifted solid-state fluorescence.
- Achieved high photoluminescence quantum yields (up to 56%) in naphthyl-fused derivatives due to restricted vibrational relaxation.
- DFT and NICS analyses confirmed electronic stabilization and enhanced aromaticity.
Conclusions:
- The developed method provides an accessible route to π-extended carborane-arene hybrids.
- The study highlights the significant potential of these materials for solid-state luminescence applications.
- Structure-property relationships were elucidated, linking fusion patterns to enhanced photophysical characteristics.
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