Four new fulgimides possessing a fluorescent coumarin unit were synthesized from the corresponding fulgides, and their photochromic as well as fluorescence properties were investigated. The open-ring forms of coumarin fulgimides were found to exhibit fluorescence in the visible region. Upon exposure to UV light, the fulgimides were transformed into the nonfluorescent closed-ring forms, which can be reverted to the initial fluorescent open-ring forms on exposure to visible light. The efficiency of quenching of fluorescence was as high as 95% at the photostationary state of UV irradiation.
Photochromism, fulgide, fulgimide, coumarin, fluorescence switch
ALLY, KHAMIS NASSOR; ÖZTÜRK, LEYLA; and KÖSE, MAHMUT
"Photochromic and fluorescence properties of coumarin fulgimides,"
Turkish Journal of Chemistry: Vol. 44:
4, Article 12.
Available at: https://journals.tubitak.gov.tr/chem/vol44/iss4/12