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Photochromic fulgides and spirooxazines: mechanism and substituent effect on photoreactions

Science China Chemistry 1996年第2期39卷 144-151页

作者：樊美公明阳福于联合张新宇孟宪娟梁永超杨茁 Institute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China

Molecular design, synthesis and photochromic properties of spirooxazines and fulgides are described. In the case of fulgides, the change of the substituents may lead to different photochromic properties and different photoreactions of the kind of compounds. In photochromic process of pyrryl-substituted fulgides, the excited singlet state is the mam species, but the excited triplet state is also involved. However, no excited triplet state has been observed in cyclization of aryl-substituted fulgides. In the case of spirooxazines, the substituents at 2’-position have great effect on the formation of photoproduct and on the mechanism of photoreaction. The increase of steric hindrance of the 2’-position substituent gives rise to the decrease of the quantum yield for the formation of photochromic merocyanine (PMC) and the increase of the relative quantum yield for the charge separated twist intermediate (CT).

关键词： photochromism spirooxazines fulgides photoreaction.

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Photoisomerization and Ring-opening Reaction of fulgides

Photoisomerization and Ring-opening Reaction of fulgides

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中国化学会第十六届全国光化学学术讨论会（2019）

作者： Zi-Wen Li Ganglong Cui Key Laboratory of Theoretical and Computational Photochemistry Ministry of Education College of Chemistry Beijing Normal University

fulgides is a major group of photochromic compounds, which has attracted considerable attention since discovered. It has been shown experimentally that the following three structures can be converted to each other under the illumination. However, the photochromic mechanism of fulgides compounds is still unclear. We studied the photoisomerization path and ring-opening path of methyl-substituted indolylfulgide in not only gas phase but also solution phase. The calculation results of MS-CASPT2 energy showed that both C-Isomer indolylfulgide and E-Isomer indolylfulgide were excited to S(ππ) and react under experimental conditions, which confirmed the experimental suppose.

关键词： fulgides QMMM

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PHOTOCHROMIC PROPERTIES OF (E)-DICYCLOPROPYLMETHYLENE-(2,5-DIMETHYL-3-FURYLETHYLIDENE)-SUCCINIC ANHYDRIDE DOPED IN POLYSTYRENE THIN FILMS

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Chinese Journal of Polymer Science 2008年第4期26卷 433-441页

作者： Abood A.Bahajaj Abdullah M.Asiri Chemistry Department Faculty of ScienceHadhramout University of Science & TechnologyP.O.Box 50512MukallaRepublic of Yemen Chemistry Department Faculty of ScienceKing Abdul Aziz UniversityJeddah 21413P.O.Box 80203Saudi Arabia

Fulgide 1-E doped in polystyrene polymer films was heated at various annealing *** irradiation with UV light(366 nm),fulgide 1-E undergoes a conrotatory ring closure to the pink colored closed form *** later color was switched back to the original color when the films were irradiated with white *** kinetics of photocoloration and photobleaching processes were followed spectrophotometrically by monitoring the absorbance of the ring closed product 1-C at itsλ_(max) of 525 *** first-...

关键词： fulgides Photochromism Polymer film Photobleaching Photoreaction kinetics Fatigue resistant

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