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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1995年第10期972-977,共6页
Acta Chimica Sinica
