Triphenylamine-based highly active two-photon absorbing chromophores with push-pull systems

作     者：Yanqi Ban Linhong Hao Zhenbo Peng Lishui Sun Lihua Teng Yingjie Zhao Yanqi Ban;Linhong Hao;Zhenbo Peng;Lishui Sun;Lihua Teng;Yingjie Zhao

作者机构：College of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Mathematics and PhysicsQingdao University of Science and TechnologyQingdao 266061China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2023年第34卷第7期

页      面：444-448页

核心收录：

学科分类：08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (Nos. 51972185, 12174211, 11874232 and 31202117) the Natural Science Foundation of Shandong Province (No. ZR2020ZD38)。 

主　　题：Star-type chromophores Triphenylamine derivatives Two-photon absorption Nonlinear optical materials Push-pull systems 

摘      要：Two triphenylamine-based star-type push-pull chromophores(T1, T2) were designed and synthesized.Triphenylamine serves as the central core and acts as an electron-donating group surrounded by electronwithdrawing pentafluorobenzene or N,N-dimethyl substituted tetrafluorobenzene, which are connected by ethylene bridges. Single-crystal X-ray diffraction confirmed the structures and molecular arrangement of two chromophores. The systematic photophysical research of T1 and T2 absorption characteristics was carried out to gain a better understanding of how structure-property relationships affect the observed nonlinear optical absorption phenomenon. Complementary calculations based on density functional theory(DFT) further confirmed the experimental results. Both chromophores exhibited excellent two-photon absorption(TPA) properties in CH_(2)Cl_(2). Notably, T2 has more remarkable nonlinear optical absorption effects with the TPA cross-section up to 4.24 × 10~7GM. By adjusting the electronic structures of the chromophores through introducing pentafluorobenzene or N,N-dimethyl as functional groups with different electron-donating or withdrawing behaviors, the TPA performance of the small organic molecule could be greatly enhanced. These molecular structures with push-pull systems were excellent candidates for different two-photon applications.