摘要
本文采用稳态和瞬态光谱方法研究了四种二苯基碘鎓盐(Ph_2I^+X^-)对蒽、芘、苝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,敏化剂与鎓盐间没有基态复合物生成。
In this paper, we report the results of excited state quenching of anthracene, pyrene and perylene by four diphenyliodonium salts by using steady and transient state spectroscopy methods. The photoinduced electron transfer rate constants were determined by Stern-Volmer analysis. These values show that Ph_2I^+AsF_6^- is the most effcient for quenching among the four onium salts 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 is dynamic process and no charge transfer complex is formed in ground state between the fluorophore and the onium salt.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1992年第5期492-497,共6页
Acta Chimica Sinica
