S. Miki et al., PHOTO-CHROMISM AND ELECTRO-CHROMISM OF A 1,4-ANTHRAQUINONE DERIVATIVE- A MULTIMODE RESPONSIVE MOLECULE, Chemical communications, (10), 1997, pp. 925-926
5,6,7-Tri-tert-butyl-1,4-anthraquinone shows electro- and photo-chromi
sm, independently based on the electrochemical redox reaction of the c
arbonyl groups and the chi[2 + 2]-type photo-valence isomerization of
the aromatic ring.