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Volume 35, Number 3, pages 337-338 (2024)
https://doi.org/10.26830/symmetry_2024_3_337
IMPACT OF SYMMETRY ON CHIROPTICAL PROPERTIES OF DOUBLE HELICENES
Tadashi Mori
Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka, 565-0871, Japan.
Email: tmori@chem.eng.osaka-u.ac.jp
1 BACKGROUND
The significance of chiral molecules in advanced materials and technologies is undeniable in chemistry yet designing them with desired chiroptical properties lacks reliable strategies.
2 MOLECUAR SYMMTERY
We recently proposed that by properly aligning multiple chiral units, chiroptical responses could be further enhanced. For instance, by aligning two hexahelicenes (HH) in various orientations and conducting theoretical calculations, the study identifies the optimal chiroptical performance in X-shaped and S-shaped double hexahelicenes (Tanaka et al., 2018). Synthesis and optical resolution of these double hexahelicenes (DNH and DPC, Figure 1) confirm experimentally the predicted increase in circular dichroism (CD) and circularly polarized luminescence (CPL). The enhanced responses stem from aligning component hexahelicenes correctly, as guided by the electric and magnetic transition dipole moments, successfully demonstrating an impact of molecular symmetry on the chiroptical properties (Mori, 2021)...
Keywords: Circular Dichroism, Circularly Polarized Luminescence, Vibrationally Resolved Emission Spectra, Herzberg-Teller effect
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