氮三乙酸根合铁（Ⅲ）络合物（Fe~ⅢNTA）的光稳定性──Fe~ⅢNTA的光致分子内氧化还原反应的机理

Photostability of nitrilotriacetato-iron(Ⅲ) complex ──Study on the mechanism of photoinduced intramolecular redox reaction of Fe￣ⅢNTA

研究了氮三乙酸根合铁（Ⅲ）络合物（ＦｅⅢＮＴＡ）（在２０．０℃、Ｉ为０．５ｍｏｌ·ｋｇ－１（ＮａＣｌＯ４）及ｐＨ值１～２的条件下）对光的稳定性．实验结果表明；随着体系酸度的增加或激发光频率的增大，ＦｅⅢＮＴＡ的光稳定性下降；游离的Ｆｅ（Ⅲ）存在会使ＦｅⅢＮＴＡ的光稳定性增强；混配络合物的生成亦会使较低频率单色光照射下的ＦｅⅢＮＴＡ稳定性下降．还讨论了本体系中ＦｅⅢＮＴＡ的光致分子内氧化还原反应的机理．

The stability of FeⅢ NTA towards photolysis has been investigated with I=0. 5 mol·kg-1 (NaClO4) in the PH range of 1～2 at 20. 0℃. The results show that the photostability of FeⅢNTA decreases with increase of system acidity or frequency of excitation light, while the presence of free Fe(Ⅲ) will increase the stability of FeⅢNTA under irradiation. The formation of mixed-ligand complexes also makes FeⅢNTA less stable to photolysis at longer wanelength (420 nm). The mechanism of photoinduced intramolecular redox reaction of FeⅢNTA under given condition has also been discussed.