吩噻嗪/二氧化钛胶体体系光诱导自由基的研究

STUDY ON THE PHOTO INDUCED FREE RADICAL IN THE SYSTEM OF PHENOTHIAZINE/TiO

用ＥＳＲ 研究了吩噻嗪（ＰＴＨ）／ 乙二醇体系和ＰＴＨ／ 乙二醇／ＴｉＯ２（ＣｄＳ，ＺｎＯ） 体系中光诱导产生的自由基ＰＴＨ·＋ ，发现在前者中ＰＴＨ·＋ 是通过光电离产生的，但在后者中ＰＴＨ·＋除通过光电离产生外，还经１ＰＴＨ＊ 及３ＰＴＨ 与ＴｉＯ２（ＣｄＳ，ＺｎＯ） 间的单电子转移来形成，而且ＰＴＨ·＋ 还与ＴｉＯ２（ＣｄＳ，ＺｎＯ） 发生进一步的单电子转移生成反磁性离子ＰＴＨ２ ＋ ．

The free radical PTH\5\++ photo induced in the system of phenothiazine(PTH)/TiO\-2 has been studied by ESR. In the system of PTH/RH, the PTH\5\++ is produced by photoionization of PTH. On the other hand, in the system of PTH/RH/TiO\-2, the PTH\5\++ is generated by photo ionization of PTH, as well as by the electron transfer from the \{\}\+1PTH\+* to the conduction band of TiO\-2. Furthermore, the diamagnetic ion PTH\+\{2+\} is also obtained by the electron transfer from the PTH\5\++ to the conduction band of TiO\-2. \;