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This research demonstrates the synthesis of novel nanographenes revealing unique chiroptical properties, indicating their potential in advanced materials.
Three curved heptagon-embedded nanographenes bearing a [5]/[6]helicene motif (5, 7, and 11) have been successfully synthesized through a Scholl-type oxidative cyclodehydrogenation. Single-crystal X-ray diffraction indicated that the introduction of helicene significantly induces pronounced distortion. The enantiomers of 11 with a high isomerization barrier of 38.54 kcal/mol based on DFT calculation were successfully resolved and displayed mirror-image circular dichroism and circularly polarized luminescence spectra.
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Gao et al. (2026) studied this question.
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