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首页> 外文期刊>Journal of pesticide science >Experimental and theoretical studies on photodegradation of fungicide diniconazole
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Experimental and theoretical studies on photodegradation of fungicide diniconazole

机译:杀菌剂迪尼康唑光降解的实验和理论研究

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摘要

The fungicide diniconazole [(E)-1-(2,4-dichlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-1-penten-3 -ol] underwent (E)/(Z) isomerization and subsequent cyclization of its (Z)-isomer to form an isoquinoline derivative on exposure to UV light (lambda > 250 nm) in methanol. The molecular geometry of the (Z)-isomer estimated from the semi-empirical AM1 molecular orbital calculations based on measurements of nuclear spin-lattice relaxation times was successfully utilized to simulate the electronic transitions of the fluorescent difluorinated derivative of the (Z)-isomer by CNDO/S calculations taking configuration interactions into consideration. The photolysis index for one-electron transition (DeltaMij) strongly suggested that photo-induced cyclization proceeds via an excited singlet state.
机译:对杀菌剂diniconazole [(E)-1-(2,4-二氯苯基)-4,4-二甲基-2-(1,2,4-三唑-1-基)-1-戊烯-3--ol]进行了( E)/(Z)异构化,然后将其(Z)异构体环化,使其在甲醇中暴露于紫外线(λ> 250 nm)时形成异喹啉衍生物。从半经验AM1分子轨道计算基于核自旋晶格弛豫时间的测量值估计的(Z)异构体的分子几何结构已成功地用于模拟(Z)异构体的荧光二氟化衍生物的电子跃迁通过CNDO / S计算将配置交互考虑在内。单电子跃迁的光解指数(DeltaMij)强烈表明,光诱导的环化反应是通过激发的单重态进行的。

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