摘要
本文通过吸收光谱滴定和时间分辨瞬态吸收光谱对芘四硫酸四钠盐（ｐｙｒｅｎｅｔｅｔｒａｓｕｌｆｏｎｉｃａｃｉｄｔｅｔｒａｓｏｄｉｕｍｓａｌｔ，ＰｙＴＳ）／甲基紫精（ｍｅｔｈｙｌｖｉｏｌｏｇｅｎ，ＭＶ２＋）复合物在水溶液中的光物理性质进行研究．用甲基紫精滴定芘四硫酸四钠盐时，得到该复合物的组成成份是１∶１，反之，用芘四硫酸四钠盐滴定甲基紫精时，同样得到１∶１组成成份的复合物．该复合物的形成常数是２．４×１０６ｍｏｌ－１·Ｌ，当用光激发该复合物时，发现其中存在芘四硫酸四钠盐到甲基紫精的电子转移过程，并得到该过程的动力学模型．
n this paper, the photophysical properties of the complex of pyrenetetrasulfonic acid tetrasodium salt(PyTS)and methylviologen(MV2+)in water have been studied using absorption titration and timeresolved transient absorption spectra. The stoichiometry of PyTS/MV2+ complex is 1∶1 when PyTS was titrated by MV2+;and the same result we got when MV2+ was titrated by PyTS. The association constant of the PyTS/MV2+is 2.4×106 mol-1·L. In the PyTS/MV2+ dimer, there is an electron transfer process from PyTS to MV2+ when it was excited by laser. From these results, we proposed the dynamic scheme of the PyTS/MV2+ dimer, however, some of processes cannot be determined owing to pulse duration limited of the used laser. Some ultrafast experiments are undergoing, especially femtosecond experiment.
出处
《感光科学与光化学》
CSCD
1997年第3期210-216,共7页
Photographic Science and Photochemistry
关键词
芘四硫酸四钠盐
甲基紫精
复合物
电子转移过程
pyrenetetrasulfonic acid tetrasodium salt, methylviologen, complex, intermolecular charge transfer
