Modification of [5]Helicene with Dimesitylboryl: One Way To Enhance the Fluorescence Efficiency

摘要： The e?cient synthetic route was disclosed to prepare structurally asymmetric [5]helicenes, which are substituted with either BMes2 (7B-HC) or both BMes2 and NMe2 (8B5NMe2-HC, 7B5NMe2-HC). Compared with the parent [5]helicene, these compounds show greatly enhanced ?uorescence. retain fairly strong ?uorescence in the solid state. Moreover, the complexation of 8B5NMe2-HC and 7B5NMe2-HC with ?uoride can induce signi?cant blue shift in ?uorescence and the formed complexes are also highly ?uorescent.

Optically Switchable Helicenes for an Enantiodivergent Steglich Rearrangement

Synthesis, structural characterization and photophysical properties of 7-cyanohexahelicene

摘要： 7-Cyanoexahelicene has been prepared in racemic form through a short photochemical synthetic approach and its enantiomeric separation was studied and allowed to obtain (P)- and (M)-enantiomers in 100% ee and > 98.5% ee, respectively. The optical rotatory dispersion and electronic circular dichroism (ECD) spectra of the resolved ones were measured. Other optical properties such as UV and photoluminescence as well as the electrochemical behavior were also examined in solutions.