关于Fe(Ⅲ)—邻菲罗啉(phen)溶液的光化学还原现象的记载可追溯到十九世纪末。本世纪以来,许多化学家用多种不同的方法对其进行了研究,但对其反应机理至今仍无定论。我们在前文研究的基础上,用气相色谱法(GC)对溶液体系光化反应后的气相组成进行了分析,并测定吸光度A_(510)值以及反应前后pH值的变化,从而推论在溶液中发生的反应。本文提出的关于光化反应是通过在溶液中形成的DAC(电子给予体—接受体配合物)来进行的假定,有待于用其他动力学方法加以研究。 Photochemical reduction of Fe (III) -phenanthroline (phen) solutions can be traced back to the late nineteenth century. Since the turn of the century, many chemists have studied it in a number of different ways, but the reaction mechanisms are still inconclusive. Based on the previous studies, we analyzed the gas phase composition of the solution system by gas chromatography (GC) and determined the absorbance value of A 510 and the pH value before and after the reaction, What happens? The hypothesis presented here that photochemical reactions are performed by DACs (electron donor-acceptor complexes) formed in solution remains to be studied with other kinetic methods.