敏化光解 盐的研究——蒽、芘、 电子转移荧光猝灭

本文采用稳态和瞬态光谱方法研究了四种二苯基碘 盐(Ph~2I^+X^-)对蒽、芘、 的激发态的猝灭作用, 通过Stern-Volmer方程确定了它们的光致电子转移速度常数。结果表明Ph~2I^+AsF^-~6对荧光猝灭是最有效的, 猝灭过程是扩散控制的。比较荧光强度和荧光寿命测定得到的猝灭常数, 表明猝灭是动态过程, 敏化剂与 盐间没有基态复合物生成。

Sensitized photolysis of onium salt--Fluorescence quenching of anthracene pyrene and perylene by electron transfer

Quenching of excited anthracene, pyrene, and perylene by diphenyliodonium salts is studied using steady- and transient state spectroscopy methods. The photoinduced electron-transfer rate constants were determine by Stern-Volmer anal. These values show that Ph2I+AsF6- is the most efficient quencher and that the quenching processes are near diffusion-controlled. Comparing the quenching constants obtained by intensity measurement with that obtained by lifetime measurement, it is confirmed that the quenching dynamic, and no charge transfer complex is formed in ground state between the fluorophore and the onium salt.