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 

机构地区：[1]College of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China [2]College of Mathematics and Physics,Qingdao University of Science and Technology,Qingdao 266061,China

出　　处：《Chinese Chemical Letters》2023年第7期444-448,共5页中国化学快报（英文版）

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)。

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.

关 键 词：Star-type chromophores Triphenylamine derivatives Two-photon absorption Nonlinear optical materials Push-pull systems 

分 类 号：TB34[一般工业技术—材料科学与工程]