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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:
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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)
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