Electron Push–Pull Effects in 3,9-Bis(<i>p</i>-(R)-diphenylamino)perylene and Constraint on Emission Color Tuning
作者:Mina Ahn、Min-Ji Kim、Kyung-Ryang Wee
DOI:10.1021/acs.joc.9b01849
日期:2019.9.20
R groups, the energy band gaps of the D-A-D compounds were systematically controlled and the emission colors were efficiently tuned from green to red. As expected, the steady state emission spectra of all D-A-D compounds were observed, as well as the emission color controlled, depending on the Hammett substituent constants (σp). In the Lippert-Mataga plots, a different charge-transfer character was
一系列基于ylene的供体-供体(DAD)化合物3,9-双(对-(R-)-二苯氨基)per(R:CN(2a),F(2b),H(2c),Me (2d)和OMe(2e))是使用3,9-二溴per与对-(R)-二苯胺合成的,并且关于电子推挽取代基效应,在DAD系统上进行了分子内电荷转移(ICT)被调查了。通过引入带有给电子或吸电子R基团的各种对-(R)-二苯胺衍生物,可以系统地控制DAD化合物的能带隙,并有效地将发射色从绿色调为红色。正如预期的那样,根据Hammett取代基常数(σp),观察到所有DAD化合物的稳态发射光谱以及受控的发射颜色。在利珀特-马塔加(Lippert-Mataga)地块中,观察到不同的电荷转移特性,这取决于电子的推挽取代,这表明从吸电子到供体取代,ICT特性逐渐提高。然而,例外地,CN-取代的2a的强吸电子基团与其他R基团化合物不相关。从实验数据和密度泛函理论计算中,我们