"Push-no-pull" porphyrins for second harmonic generation imaging
"Push-no-pull" porphyrins for second harmonic generation imaging
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DOI：
10.1039/c3sc22306j
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发表时间：
2013-01-01
期刊：
影响因子：
8.4
通讯作者：
Anderson, Harry L.
中科院分区：
文献类型：
--
作者：
Lopez-Duarte, Ismael;Reeve, James E.;Anderson, Harry L.
设计具有强二阶非线性光学（NLO）活性的分子的既定方法是通过π共轭桥将电子给体连接到电子受体，形成推挽系统。令人惊讶的是，我们已经发现，具有大的第一超极化率，并表现出强的二次谐波产生（SHG）的染料，可以创建只是通过连接电子供体卟啉。游离碱卟啉核是足够缺电子的，使得超极化率在添加吡啶鎓电子受体时不增加。
The established approach to design a molecule with strong second-order nonlinear optical (NLO) activity is to connect an electron-donor to an electron-acceptor via a pi-conjugated bridge, to generate push-pull system. Surprisingly, we have found that dyes with large first hyperpolarizabilities, and which exhibit strong second harmonic generation (SHG), can be created just by attaching an electron-donor to a porphyrin. The free-base porphyrin core is sufficiently electron-deficient that the hyperpolarizability does not increase on addition of a pyridinium electron-acceptor.