【摘要】 合成了3个系列各含有单支、双支和三支结构的9个均三嗪衍生物,测定了它们的线性吸收和发射性质以及双光子吸收和发射性质.随着三嗪环上侧链数目的增加,线性吸收谱(吸收峰位于390-440 nm)、荧光谱(发射峰位于460- 580 nm)和双光子荧光谱(激发波长800 nm)都发生红移;各种光谱的强度逐渐增强;基态与激发态的偶极矩之差△μeg也逐渐增大.另外,从单支到三支结构,双光子吸收截面σ随侧链数目呈非线性增加.这表明多支结构的双光子吸收存在显著的增强效应.更多还原

【Abstract】 Three series of multi-branched s-triazine derivatives with one, two or three branches have been synthesized. For each series, the linear absorption (peak position: 390-440 nm) and emission spectra (peak position: 460-580 nm), along with the two-photon exited fluorescence spectra excited at 800 nm, showed regular red-shifts as the branch number was increased, and their spectral intensities were significantly enlarged from one- to three-branched structures. In addition, the difference of dipole moment (△μeg) between the ground and the excited states became larger as the branch number was increased from 1 to 3. The two-photon absorption cross section σ was non-linearly increased with the increase of the branch number and the reduced σ, indicating a remarkable cooperative enhancement of a in the multi-branched s-triazine derivatives.更多还原