五种对苯撑乙烯低聚物的光氧化降解反应表明 :给电子基团能促进其光氧化降解 ,而吸电子基团却能提高它们的光稳定性。这为用分子修饰的方法提高对苯撑乙烯类发光材料的稳定性提供了理论基础。在自敏化和染料敏化的光氧化降解反应中 ,五种低聚物的降解速率顺序完全一致 ,意味着单线态氧 ( 1O2 )是其光氧化降解反应过程中的主要中间体。ESR自旋捕获实验进一步证实了上述论断。 The photooxidative degradation of five p-phenylene vinylene oligomers showed that electron donating groups promoted their photooxidative degradation while electron-withdrawing groups increased their photostability. This provides a theoretical basis for improving the stability of the phenylenevinylene luminescent materials by the method of molecular modification. In the self-sensitized and dye-sensitized photodegradation reactions, the degradation rates of the five oligomers are in exactly the same order of magnitude, implying that singlet oxygen (1O2) is the main intermediate during photooxidative degradation. ESR spin capture experiments further confirmed the above assertion.