一种铟酞菁染料的吸收光谱及其光褪色现象研究

Absorption Spectra and Photofading Research of an Indium Phthalocyanine Dye

对一种可望应用于 6 94nm激光防护的铟酞菁染料 (InPc) ,利用玻璃模具制备了铟酞菁掺杂高分子聚甲基丙烯酸甲酯和聚碳酸酯薄膜。研究了该染料的氯仿溶液和薄膜吸收光谱 ,并分析了电子结构 ,同时推导了溶液中的光褪色机理。研究表明 ,在实验溶液浓度范围内InPc以单体形式存在 ,6 94nm处的吸收强度和窄吸收峰形符合激光防护的要求 ,而InPc薄膜 Q 带出现两个吸收强度大致相等的峰 ,吸收波长较溶液光谱有少量蓝移或红移 ,吸收带增宽 ,且在不同高分子体系中获得相同吸光强度的薄膜所需染料的量明显不同 ,这主要是由于染料分子发生光降解和聚集态不同而使薄膜光谱特点复杂化。同时 。

An indium phthalocyanine dye dopped PMMA and PC thin film were obtained by a optical glass modul, which maybe used as a laser protective dye. The absorption spectra of chloroform solution, PMMA and PC films were studied. It was revealed that indium phthalocyanine monomer existed in the tested concentrations, there was an intense and sharp absorption at 694nm, which suited for laser protection. At the same time, the spectra were explained with its energy levels structure. In films, two strong and shouder absorption bands were observed in Q band, which were slightly hypsochromically or hypochromically shifted and wider compared with the solution absorption spectra. In order to obtain the same absorbance the dyes needed changed greatly. These phenomena can be explained that there were photofading in solutions and molecular aggregation in polymers. At the same time, based on the resulting fragments by EI MS, the mechanism of the photofading was proposed.