Photochromic compounds

Ebook "Photofunctional layered materials (Structure and bonding, Volume 166)" are regarded as one of the most interesting photo-related topics. In the fifth chapter, Ogawa et al. provide an overview of the development of photochromic intercalation compounds and describe how the formation of different layered host materials allows control over the orientation and aggregation of photochromic guests as well as the resulting photoresponsive properties.

247p tudohanhtau1006 29-03-2024 1 1   Download

The synthesis, photochromic features, and electrochemistry of a novel material based on dithienylethene (DTE) and 3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine (didecyl-ProDOT) units are described. It is noteworthy that 1,2-bis(5-(3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-6-yl)-2-methylthiophen-3-yl)cyclopent-1-ene can be efficiently switched between open and closed states by light in both solution and in the solid poly(methyl metacrylate) (PMMA) matrix. It is also found that the emission of this novel compound can be switched on and off upon irradiation.

10p langthannam 29-12-2021 15 0   Download

Three new photochromic compounds, 3-(2,5-dimethyl-3-thienyl)-4-(2-phenyl-5-methyl-4-thiazolyl)-1,8-naphthalimide (1-O), 2,3-bis(2-phenyl-5-methyl-4-thiazolyl)-7H -benzimidazo[2,1-a]benzo[de]isoquinolin-7-one (2-O), and 2,5- dimethyl-3-thienyl)-7H -benzimidazo[2,1-a]benzo[de]isoquinolin-7-one (3-O), were synthesized and their photochromic properties were studied. Compound 1-O was synthesized by two consecutive Suzuki coupling reactions using 2,5- dimethylthiophene-3-boronic acid and 5-methyl-2-phenylthiazole-4-boronic acid.

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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.

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