Synthesis, photophysical and chiroptical properties of 9–cyano[7]helicene for OLED applications. A combined experimental and theoretical investigation

The synthesis of 9–cyano[7]helicene achieved a 62% overall yield with high purity, following a two-step procedure. Characterization was carried out using 1 H, 13 C, and COSY NMR spectroscopy, as well as FT–IR analysis. The racemic mixture of helicene was effectively separated into P – and M –enantio...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2024-03, Vol.35 (7), p.542, Article 542
Main Authors: Hajji, Ibtissem, Chemek, Mourad, Alzahrani, Abdullah Y. A., Hassine, Béchir Ben, Aloui, Faouzi
Format: Article
Language:English
Subjects:
Absorption spectra
Characterization and Evaluation of Materials
Chemistry and Materials Science
Chromatography
Dichroism
Electrodes
Enantiomers
Energy levels
Experiments
Infrared analysis
Light emitting diodes
Materials Science
Molecular orbitals
NMR spectroscopy
Optical and Electronic Materials
Purity
Quantum chemistry
Software
Synthesis
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Summary:The synthesis of 9–cyano[7]helicene achieved a 62% overall yield with high purity, following a two-step procedure. Characterization was carried out using 1 H, 13 C, and COSY NMR spectroscopy, as well as FT–IR analysis. The racemic mixture of helicene was effectively separated into P – and M –enantiomers with exceptional optical purity (> 99% ee ). This separation allowed us to showcase substantial optical rotations (+ 4800 for the P –enantiomer at λ = 589 nm) and notable electronic circular dichroism (ECD) signals. The organic material exhibited a robust UV absorption band and emitted a vibrant blue light, resulting in a fluorescence quantum yield of 11%. Experimentally determined electronic energy levels revealed HOMO energy of − 5.86 eV and LUMO energy of − 3.25 eV, yielding an electrochemical band gap of 2.61 eV. Furthermore, an in-depth analysis of absorption and ECD spectra, along with molecular electrostatic potential (MEP) and reduced density gradient (RDG) calculations using quantum chemistry, highlighted the material’s fundamental characteristics. These findings collectively suggest that this compound holds promise as a potential candidate for use in electroluminescent devices and OLED technology.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-024-12275-3