New hybrid dyes, analogs of the BODIPY laser dye PM567, with the chromophore group covalently bound to a POSS T8 group, have been prepared and their photophysical properties in ethyl acetate solution and in poly(methyl methacrylate) (PMMA) thin film solution have been studied. In PMMA solution and under comparative conditions, the dyes show higher thermostability than the parent dye PM567, the related compound POSS(iBu)8, and the corresponding unbound model dyes, because the first mass loss takes place at higher temperatures. In addition, their photostabilities in the same medium under irradiation with 365 nm light are much higher than those of the dye PM567 or an equimolar mixture of PM567 plus POSS(iBu)8 under the same conditions, indicating that the POSS moiety photostabilizes the bound BODIPY group. The different photostabilities could be a consequence of different reactivities of the hybrid dyes with self-generated singlet oxygen, because they show lower reaction rate constant values than PM567, although the observed tendency of these values does not correlate with that of the photodegradation quantum yield values. The new hybrid materials can be employed in applications where highly photostable and highly emissive dyes are required.
新型杂化
染料,作为激光
染料PM567的类似物,其色素基团与POSS T8基团共价结合,已被合成,并研究了其在
乙酸乙酯溶液和
聚甲基丙烯酸甲酯(P
MMA)薄膜溶液中的光物理性质。在P
MMA溶液中,在比较条件下,这些
染料表现出比原
染料PM567、相关化合物POSS(iBu)8及相应未结合的模型
染料更高的热稳定性,因为首次质量损失发生在更高的温度下。此外,在365 nm光照射下,它们在相同介质中的光稳定性远高于
染料PM567或在相同条件下的PM567和POSS(iBu)8等摩尔混合物,表明POSS基团能够光稳定结合的BODIPY基团。这些不同的光稳定性可能是由于杂化
染料与自生单态氧的反应性差异造成的,因为它们的反应速率常数值低于PM567,尽管这些值的观察趋势与光降解量子产率值的趋势不相关。这些新型杂化材料可以应用于对高度光稳定和高发射性
染料有需求的领域。