Vivid color change from intense yellow to deep purple was observed upon electrochemcal oxidation of the title donor <B>1</B> to bis(Michler's hydrol blue)-type dication <B>1</B><SUP>2+</SUP>. Since the interconversion was also accompanied by drastic geometric changes, configurational stability of the helical π-arrangement is modified upon redox reactions.
Suzuki, T., Mikuni, S., Ishigaki, Y., Higuchi, H., Kawai, H., & Fujiwara, K. (2009). 4,5-Bis(diarylmethylene)-1,3-dithiole: A Novel Helical Electron Donor Exhibiting Electrochromic Behavior. Chemistry Letters, 38(7), 748-749. https://doi.org/10.1246/cl.2009.748