A new building block, bis(thiophene vinyl)-pyrimidine, for constructing excellent two-photon absorption materials: synthesis, crystal structure and properties
作者:Dugang Chen、Cheng Zhong、Xiaohu Dong、Zhihong Liu、Jingui Qin
DOI:10.1039/c2jm14766a
日期:——
Two new molecules (Py1 and Py2) of D–π–A–π–D motif, where the –π–A–π– moiety is bis(thiophene vinyl)-pyrimidine as a building block, have been designed and synthesized via the Knoevenagel and Suzuki coupling reactions. The X-ray single crystal structure analysis of Py1 showed good coplanarity in the whole building block. Their two-photon absorption (2PA) properties were measured by two-photon induced fluorescence techniques with a mode-locked Ti: sapphire pulsed laser in the range of 700–940 nm. Both Py1 and Py2 exhibited large cross-section values of 1702 and 1879 GM, respectively, no matter whether the peripheral donor is weak or strong. The results demonstrate that bis(thiophene vinyl)-pyrimidine is a new building block for constructing molecules with effective 2PA.
通过克诺文纳格尔(Knoevenagel)和铃木(Suzuki)偶联反应,设计并合成了两个以双(噻吩乙烯基)嘧啶为结构单元的 D-π-A-π-D 主题的新分子(Py1 和 Py2)。对 Py1 的 X 射线单晶结构分析表明,整个结构单元具有良好的共面性。它们的双光子吸收(2PA)特性是通过双光子诱导荧光技术在 700-940 nm 范围内使用锁模钛蓝宝石脉冲激光器进行测量的。无论外围供体是弱还是强,Py1 和 Py2 都分别显示出 1702 GM 和 1879 GM 的大截面值。研究结果表明,双(噻吩乙烯基)嘧啶是构建有效 2PA 分子的新构件。