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Ｆｅ（Ⅲ）与邻菲啰啉（Ｐｈｅｎ）可形成无色的Ｆｅ（Ｐｈｅｎ）３３＋配合物，在紫外光照射下，上述配合物可发生光化学还原反应，生成红色的Ｆｅ（Ｐｈｅｄ）３２＋配合物。本研究以低压汞灯作为光源，研究了各种有机酸及溶液酸度对Ｆｅ３＋－Ｐｈｅｎ体系光化学还原反应速率的影响规律，并初步探讨了有机酸在光化学还原反应中的作用机理。实验表明，Ｆｅ３＋－Ｐｈｅｎ体系的光化学还原反应为零级反应，各种有机酸对光化学还原反应速率有明显影响，其一级电离平衡常数的大小与光化学还原反应速率常数问存在一定关系。
Fe (Ⅲ) and phenanthroline (Fe) can form colorless Fe (Phen) 33+ complexes. Under UV light irradiation, these complexes can undergo photochemical reduction to form red Fe (Phed) 32+ complexes . In this study, the low-pressure mercury lamp was used as light source to study the effect of various organic acids and acidity of solution on the photochemical reduction reaction rate of Fe3 + -Phen system. The mechanism of action of organic acids in photochemical reduction reaction was also discussed. Experiments show that the photochemical reduction reaction of Fe3 + -Phen system is zero-order reaction, and various organic acids have a significant effect on the photochemical reduction reaction rate. The magnitude of the first-order ionization equilibrium constant is related to the photochemical reduction rate constant.