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Updated: Dec 22, 2025
08:54
Bimolecular Fluorescence Complementation
Published on: April 15, 2011
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A molecular boron cluster-based chromophore with dual emission
Kierstyn P Anderson1, Mary A Waddington, Gary J Balaich
1Department of Chemistry and Biochemistry and California NanoSystems Institute (CNSI), University of California, Los Angeles, California 90095, USA. spokoyny@chem.ucla.edu.
Dalton Transactions (Cambridge, England : 2003)
|May 8, 2020
Summary
Researchers synthesized a brominated borane, 4-Br-anti-B18H21, which shows dual emission. This luminescent borane derivative could serve as a ratiometric oxygen probe due to its distinct fluorescence and phosphorescence responses.
Area of Science:
- Inorganic Chemistry
- Materials Science
- Photophysics
Background:
- Boranes are a class of boron-hydride compounds with unique electronic and structural properties.
- Luminescent boranes offer potential applications in sensing and optoelectronics.
- Electrophilic substitution is a key reaction for functionalizing borane cages.
Purpose of the Study:
- To synthesize a novel brominated derivative of the luminescent borane anti-B18H22.
- To investigate the photophysical properties, including luminescence and oxygen sensitivity, of the synthesized compound.
- To explore the potential of the new compound as a ratiometric oxygen probe.
Main Methods:
- Electrophilic bromination of anti-B18H22 using aluminum chloride (AlCl3) and bromine (Br2).
- Characterization of the resulting monosubstituted product, 4-Br-anti-B18H21, as an air-stable crystalline solid.
- UV-Vis spectroscopy to study dual emission (fluorescence and phosphorescence) and oxygen quenching effects in cyclohexane.
Main Results:
- Successful synthesis and isolation of 4-Br-anti-B18H21.
- Observation of dual emission: fluorescence at 410 nm and phosphorescence at 503 nm.
- Selective quenching of phosphorescence by oxygen, while fluorescence remains unaffected, indicating potential for ratiometric sensing.
Conclusions:
- 4-Br-anti-B18H21 is a stable, luminescent borane derivative with distinct photophysical properties.
- The differential response of fluorescence and phosphorescence to oxygen suggests its utility as a ratiometric oxygen sensor.
- This study expands the scope of functionalized luminescent boranes for sensing applications.
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