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Chiral Luminescent Aza[7]helicenes Functionalized with a Triarylborane Acceptor and Near-Infrared-Emissive Doublet-State Radicals.

Jiaxian DuanYafei ShiFei ZhaoChenglong LiZhihua DuanNiu ZhangPangkuan Chen
Published in: Inorganic chemistry (2023)
This paper presents new chiral luminescent molecules ( N7-BMes2 and N7-TTM ) using configurationally stable aza[7]helicene ( 1 ) as a universal heteroatom-doped chiral scaffold. The respective reactions of electron-donating 1 with a triarylborane acceptor via palladium-catalyzed Buchwald-Hartwig C-N coupling and with the open-shell doublet-state TTM radical via nucleophilic aromatic substitution (S N 2Ar) resulted not only in tunable emissions from blue to the NIR domain but also in significantly enhanced emission quantum efficiency up to Φ = 50%.
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