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报道了三个具有典型A π A′型共轭结构的苯并噻唑衍生物的合成及结构 -双光子吸收光物理特性关系 .通过对三个化合物的共轭结构增长和拉电子基强度变化对化合物单光子荧光光谱、双光子诱导荧光光谱和双光子吸收截面等特性的影响研究 ,我们发现 ,苯并噻唑杂环中的杂原子硫在化合物共轭链短时对其光物理特性影响很强 ,在共轭链较长时影响减弱甚至消失 .通常情况下 ,共轭链长度和拉电子基强度共同对双光子吸收截面作贡献 ,我们的研究表明 ,当共轭链较长时 ,共轭链的增长对增强分子双光子吸收截面的贡献远大于拉电子基强度变化的贡献 .其中 ,新化合物 2 ( 2 {4 [2 ( 4 硝基苯基 ) -乙烯基 ] -苯基 }-乙烯基 ) -苯并噻唑具有双光子吸收截面大 ( 181× 10 -50 cm4s/photon)和荧光量子产率高( 13 .8%)的特点 ,是双光子荧光显微与成像应用的一个良好的候选材料
The synthesis and structure-photophysical properties of three benzothiazole derivatives with typical A π A ’-conjugated structures were reported.The photoconductivity of three compounds was investigated by the increase of the conjugate structure and the change of the intensity of the electron-withdrawing group Compound single-photon fluorescence spectroscopy, two-photon induced fluorescence spectroscopy and two-photon absorption cross-section and other characteristics of the study, we found that the heteroatomic sulfur in the benzothiazole heterocyclic compounds conjugate chain short time on its photophysical properties of a strong influence , The conjugate chain with longer or even disappeared influence conjugate chain length and the electron-withdrawing group strength together contribute to the two-photon absorption cross section, our study shows that when the conjugate chain is longer, conjugation The contribution of the chain growth to the enhanced two-photon absorption cross-section is much larger than that of the electron-withdrawing group. Among them, the new compound 2 (2 {4 [2 ) -benzothiazole is characterized by its large two-photon absorption cross-section (181 × 10 -50 cm4s / photon) and high fluorescence quantum yield (13.8%), which is a good one for two-photon fluorescence microscopy and imaging applications Candidate material