【摘要】 本文研究咔唑及其衍生物对9-氰基蒽(9CNA)的荧光猝灭机理.结果表明,猝灭过程有以下三种方式:(1)-系列N-烷基咔唑及1,4-二咔唑丁烷、反式1,2-二咔唑环丁烷、N-苄基咔唑等对9CNA的荧光猝灭是通过形成激基复合物.(2)咔唑对9CNA的荧光猝灭是通过形成氢键.(3)1,3-二咔唑丙烷及N-乙烯基咔唑对9CNA的荧光猝灭是属于一般碰撞猝灭过程.以上所有猝灭过程主要都是来自电荷转移相互作用.另外,还讨论了空间位阻对形成激基复合物的影响.并由稳态和动态荧光实验结果,应用Ware关于激基复合物的形成和解离的动力学公式计算出一系列光物理速率常数.更多还原

【Abstract】 The quenching mechanism of 9-cyanoanthracene (9CNA) fluorescence by carbazole and its derivatlves was studied. The results show that the quenching process can be in three different ways: exciplex formation, H-bonding formation in the excited state of 9CNA and general collision. All the above quenching effects chiefly come from charge transfer interaction. In addition, the steric hindrance is also important for exciplex formation. The photophysical rate constants were obtained based on Ware kinetics scheme of exciplex formation and dissociation. Both steadystate and transient fluorescence measurements were employed for the determination of the rate constants.更多还原