Functional helquats: helical cationic dyes with marked, switchable chiroptical properties in the visible region.

Paul E Reyes-Gutiérrez,Michael Jirásek,Lukáš Severa,Pavlína Novotná,Dušan Koval,Petra Sázelová,Jan Vávra,Andreas Meyer,Ivana Císařová,David Šaman,Radek Pohl,Petr Štěpánek,Petr Slavíček,Benjamin J Coe,Miroslav Hájek,Václav Kašička,Marie Urbanová,Filip Teplý

CHEMICAL COMMUNICATIONS（2015）

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摘要

Helquat dyes are the first helicene-like cationic styryl dyes obtained as separate enantiomers. Their remarkable chiroptical properties are due to the unique combination of a cationic hemicyanine chromophore and a helicene-like motif. The magnitude of the ECD response and the pH switching along with their positioning in the visible region are unprecedented among helicenoids.

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