Effect of Nitro-Substitution on the Photochemistry of 3-Piperidino-1,2-benzisothiazole Derivatives: A Mechanistic Investigation
作者:Takashi Karatsu、Hiroharu Tanikawa、Kazuhiro Ishii、Shun Kubota、Takashi Sasanuma、Shiki Yagai、Akihide Kitamura
DOI:10.3987/com-09-11889
日期:——
2-benzisothiazole (BIT)-benzothiazole (BT) was investigated. In particular, the effect of nitro-substitution on the benzene ring was selectively examined for the parent, 5-nitro-, and 7-nitro-derivatives. 3-Piperidino-BIT and nitro-3-piperidino-BIT isomerized irreversibly to the corresponding 2-piperidino-BT, and this reaction mechanism was investigated using density-functional theory (DFT) and time-dependent
研究了 3-哌啶基-1,2-苯并异噻唑 (BIT)-苯并噻唑 (BT) 的光化学异构化。特别是,对母体、5-硝基和 7-硝基衍生物选择性地检查了硝基取代对苯环的影响。3-Piperidino-BIT 和 nitro-3-piperidino-BIT 不可逆地异构化为相应的 2-piperidino-BT,并使用密度泛函理论 (DFT) 和时间相关 (TD)-DFT 计算研究了该反应机理。这些计算表明,这种异构化经历了氮丙啶中间体。此外,激发波长效应表明异构化发生在硝基衍生物的上激发态。HOMO-LUMO 跃迁具有电荷转移和光惰性特征。