Trifluoromethyl-substituted Photochromic Indolylfulgide. A Remarkably Durable Fulgide towards Photochemical and Thermal Treatments
An indolylfulgide having a 1-(1,2-dimethyl-3-indolyl)-2,2,2-trifluoroethylidene group on the succinic anhydride showed an excellent resistivity towards the repetition of photochromic transformation between the photostationary states of UV- and visible-light irradiation both in toluene and in a PMMA film under the atmospheric environment. The colored form also showed the remarkable thermal stability.