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·1808· 精细化工 FINE CHEMICALS 第 35 卷
[5]
分子内长寿命电荷分离态 。Ⅲa 分子给受体之间同时 的直接还原;然而对于硝基乙烯基化合物Ⅰc 和氰基
存在共轭效应和电子效应,对于Ⅲb、Ⅲc、Ⅲd,共 乙烯基化合物Ⅰd,分子内 ICT 作用会降低受体含氮
轭被打断,给受体之间电子效应成为影响分子内电 基团的还原稳定性,不利于双键选择性还原。对系列
荷转移分离的主要因素,这在 Higashino 等报道的以 化合物Ⅲb、Ⅲc、Ⅲd 的基本光物理性质进行了表征,
对二甲基亚苯基连接的 D-A 体系中已经得到一定体 通过光物理过程分析,初步证实Ⅲb、Ⅲc、Ⅲd 为
[9]
现 。通过分析紫外-可见吸收光谱,以及循环伏安 一类具有光诱导给受体之间电荷转移分离的 D-A 结
得到的 HOMO 与 LUMO 能级,结合荧光发射光谱 构有机光电材料。本文对利用选择性还原反应构筑
(图 4b),Ⅲb、Ⅲc、Ⅲd 相较于其给体部分 MTPA 新型柔性连接 D-A 结构有机光电材料有着一定的理
出现了明显的荧光猝灭,说明Ⅲb、Ⅲc、Ⅲd 具有与 论指导意义。
Ⅲa 类似的给体部分(MTPA)向受体部分(TRC)
参考文献:
的光诱导电子转移特征,并可产生长寿命的电荷分
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和肟基化合物Ⅰb,分子内 ICT 作用有利于含氮基团 (下转第 1816 页)