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Modification of [5]Helicene with Dimesitylboryl: One Way To Enhance the Fluorescence Efficiency
Zheng-Hua Zhao1, Meng-Yuan Zhang1, Di-Hong Liu1
1School of Chemistry and Chemical Engineering , Shandong University , Jinan 250100 , People's Republic of China.
Abstract:
The efficient 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 fluorescence. In addition, they still retain fairly strong fluorescence in the solid state. Moreover, the complexation of 8B5NMe2-HC and 7B5NMe2-HC with fluoride can induce significant blue shift in fluorescence and the formed complexes are also highly fluorescent.
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