一种新的敏化/猝灭室温燐光法——CTAB胶束中α-溴代萘敏化联乙酰的室温燐光猝灭  

Quenching of Room Temperature Phosphorescence of Biacetyl Sensitized by α-Bromonaphthalene in CTAB Micelles

作　　者：谢剑炜[1] 许金钩[1] 陈国珍[1] 

机构地区：[1]厦门大学化学系现代分析化学研究所,厦门361005

出　　处：《化学学报》1995年第10期972-977,共6页Acta Chimica Sinica

摘　　要：本文首次报道了将敏化和猝灭同时偶合在同一体系中的敏化/猝灭室温烘燐新方法.体系中,CTAB胶束一方面增强α-溴代萘的室温燐光发射、α-溴代萘和联乙酰的三重态-三重态能量转移效率,另一方面起到猝灭α-溴代萘敏化联乙酰发射的室温燐光的作用.CTAB对联乙酰的猝灭反应由三重态-三重态能量转移速率限制,求得α-溴代萘敏化联乙酰的三重态-三重态能量转移速率常数为1.76×10~9(mol·dm^(-3)^(-1)S^(-1),CTAB对联乙酰的猝灭常数为7.82×10~7(mol·dm^(-3)^(-1)S^(-1).详细研究了实验条件,实现了猝灭法测定联乙酰,检测限达2.8×10^(-8)mol·dm^(-3).A new method of determining biacetyl in aqueous solutions by quenching its room temperature phosphorescence sensitized by α-bromonaphthalene in CTAB micelles is presented. CTAB micelles facilitate the triplet-triplet state energy transfer between α-bromonaphthalene and biacetyl and enhance the phosphorescence emission of α-bromonaphthalene; CTAB micelles act also as a quencher of quenching the phosphorescence of biacetyl sensitized by α-bromonaphthalene. The rate constant of triplet-triplet energy transfer between α-bromonaphthalene and biacetyl is 1.76×109 (mol ·dm-3)-1s-1 and the quenched rate constant of biacetyl phosphorescence by CTAB is 7.82 ×107 (mol·dm-3)-1s-1. The detection limit of biacetyl is 2.8×10-8mol·dm-3.

关 键 词：室温Lin光法 联乙酰 溴代萘 敏化 

分 类 号：O644.1[理学—物理化学] O657.3[理学—化学]