Abstract
The newly prepared tetracyanoanthraquinodimethane (TCNAQ) derivatives 1a, b with a chiral auxiliary are good electron acceptors and exhibit weak circular dichroism (CD) based on the absorption of TCNAQ. The twin-type electron acceptor 1c with two TCNAQ units shows larger ellipticity by exciton coupling. UV–vis, CD, and fluorescence spectra were changed drastically upon electrochemical reduction of 1c , which demonstrates the unprecedented three-way-output response system.
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