Tang Yiwen, Liu Hui, Zhang Hui, Li Dandan, Su Jian, Zhang Shengyi, Zhou Hongping, Li Shengli, Wu Jieying, Tian Yupeng
Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230039, PR China.
Department of Chemistry, Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province, Anhui University, Hefei 230039, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2017 Mar 15;175:92-99. doi: 10.1016/j.saa.2016.12.017. Epub 2016 Dec 15.
A series of water-soluble stilbazolium salts with A-π-A (A: Acceptor) model have been synthesized and fully characterized. The results obtained from absorption spectra and TD-DFT computational studies show that there is a relative strong intramolecular charge transfer (ICT) transition from pyridine unit to pyridine cation of the stilbazolium salts. Furthermore, it is found that the three stilbazolium salts (T1, T2, T3) show the strong two-photon absorption (2PA) response in the near-infrared (IR) region by Z-scan technique using femtosecond laser. And the stilbazolium salt T3 shows the largest two-photon absorption cross-section and third-order nonlinear optical (NLO) coefficient χ at 730nm, indicating the different terminal substituent group of the pyridinium plays a vital role in third-order NLO behavior.
一系列具有A-π-A（A：受体）模型的水溶性二苯乙烯盐已被合成并进行了全面表征。吸收光谱和TD-DFT计算研究结果表明，二苯乙烯盐存在从吡啶单元到吡啶阳离子的相对较强的分子内电荷转移（ICT）跃迁。此外，通过使用飞秒激光的Z扫描技术发现，三种二苯乙烯盐（T1、T2、T3）在近红外（IR）区域表现出强烈的双光子吸收（2PA）响应。并且二苯乙烯盐T3在730nm处显示出最大的双光子吸收截面和三阶非线性光学（NLO）系数χ，表明吡啶鎓的不同末端取代基在三阶NLO行为中起着至关重要的作用。
