W-Shaped π-Extended Double Undecabenzo[7]helicene
Yun‐Jia Shen, Li‐Jun Peng, Lina Diao, Nai‐Te Yao, Wen‐Kai Chen, Yang Yang, Meng Qiu, Wenxiu Zhu, X. Li, Xingyu Wang, Han‐Yuan Gong
Abstract
A chiral W-shaped fully π-extended double [7]helicene ( ED7H ) has been synthesized and fully characterized. It displays fluorescence emission (λ em = 636 nm) with a quantum yield (Φ f ) of 0.10. In comparison to its X-shaped and monomict π-extended [7]helicene analogues, enantiopure W-shaped ED7H exhibited superior chiral optical characteristics, including distinct circular dichroism signals from 400 to 650 nm, a good dissymmetric emission factor | g lum | of 4 × 10 –3, and a circularly polarized luminescence brightness value B CPL of 42 M –1 cm –1 .
Topics & Concepts
HeliceneChemistryStereochemistryMoleculeOrganic chemistrySynthesis and Properties of Aromatic CompoundsAdvanced NMR Techniques and ApplicationsFullerene Chemistry and Applications