Structural factors influencing the intramolecular charge transfer and photoinduced electron transfer in tetrapyrazinoporphyrazines
作者:Veronika Novakova、Petr Hladík、Tereza Filandrová、Ivana Zajícová、Veronika Krepsová、Miroslav Miletin、Juraj Lenčo、Petr Zimcik
DOI:10.1039/c3cp54731k
日期:——
Several structural factors were found to play a critical role in ICT efficiency. The substituent in the ortho position to the donor center significantly influences the ICT, with tert-butylsulfanyl and butoxy substituents inducing the strongest ICTs, whereas chloro, methyl, phenyl, and hydrogen substituents in this position reduce the efficiency. The strength of the donor positively influences the ICT
合成了一系列具有一个外围连接的氨基取代基(供体)的氮杂酞菁类化合物的一系列不对称四吡嗪并卟啉(TPyzPzs),并确定了它们的光物理性质(荧光量子产率和单线态氧量子产率)。预计合成的TPyzPzs会经历分子内电荷转移(ICT),这是使它们的激发态失活的主要途径。发现一些结构性因素在ICT效率中起着至关重要的作用。在的取代基邻位的位置到供体中心显著影响ICT,与叔-丁基硫烷基和丁氧基取代基可诱导最强的ICT,而该位置的氯,甲基,苯基和氢取代基会降低效率。供体的强度对ICT效率产生积极影响,并且与TPyzPz上用作取代基的胺的氧化势相关性很好,如下所示:正丁胺< N,N-二乙胺<苯胺<吩噻嗪。TPyzPz中的ICT(具有共轭的供体和受体)也被证明比光致电子转移更强,在光电子转移中,供体和受体通过脂族连接基连接。