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Ultra-Narrowband Circularly Polarized Luminescence from Multiple 1,4-Azaborine-Embedded Helical Nanographenes
Fangyuan Zhang1, Vincenzo Brancaccio1, Fridolin Saal1
1Institut für Organische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland D-97074, Würzburg, Germany.
Journal of the American Chemical Society
|October 22, 2024
Summary
Researchers developed ultranarrowband circularly polarized luminescence (CPL) using helical nanographenes with embedded azaborine. This strategy yields some of the narrowest CPL observed for organic molecules, aiding future optical material design.
Area of Science:
- Organic Chemistry
- Materials Science
- Photophysics
Background:
- Circularly polarized luminescence (CPL) is crucial for advanced optical applications.
- Achieving ultranarrowband CPL in organic molecules remains a significant challenge.
- Helical nanographenes offer a promising scaffold for chiroptical materials.
Purpose of the Study:
- To develop a strategy for ultranarrowband CPL using 1,4-azaborine-embedded helical nanographenes.
- To investigate the influence of boron and nitrogen atom placement on molecular optical properties.
- To achieve CPL with a narrow full width at half-maximum (fwhm).
Main Methods:
- Synthesis of 1,4-azaborine-embedded helical nanographenes.
- Spectroscopic characterization of optical properties (absorption, emission, CPL, fluorescence).
- Investigation of structure-property relationships.
- Quantum chemical calculations, including vibronic contributions to CPL spectra.
Main Results:
- Demonstrated ultranarrowband fluorescence (fwhm 16-17.5 nm) and CPL (fwhm 18-19 nm) in toluene.
- Reported some of the narrowest CPL fwhm values for organic molecules to date.
- Established the impact of azaborine incorporation on optical characteristics.
Conclusions:
- The presented strategy effectively achieves ultranarrowband CPL from helical nanographenes.
- Molecular design incorporating azaborine units is key for narrowband CPL.
- The findings provide insights for designing next-generation chiroptical materials.
