厚朴酚在乙醇中的荧光自猝灭及猝灭机理  

Fluorescence Self-quenching and the Quenching Mechanism of Magnolol

作　　者：黎红梅[1] 陈亚东[1] 严拯宇[1] 胡育筑[1] 

机构地区：[1]中国药科大学基础部,南京210038

出　　处：《物理化学学报》2007年第9期1454-1458,共5页Acta Physico-Chimica Sinica

基　　金：中国药科大学青年教师基金(D0318)资助项目

摘　　要：系统研究了厚朴酚的荧光光谱和吸收光谱随浓度的变化,揭示了厚朴酚具有较强的自猝灭特性.其猝灭包括静态和动态机制:随着浓度增加,厚朴酚发生聚集;同时,单体和聚集体对荧光的猝灭表现为动态猝灭,由单体、二聚体、三聚体造成的荧光猝灭速率常数k_(qm)、k_(qd)、k_(qt)值远大于扩散控制的荧光猝灭速率常数.说明除扩散控制的短程能量转移引起的猝灭外,厚朴酚还存在长程能量转移导致的猝灭机制.The absorption and emission spectra of magnolol in ethanol were determined,and the fluorescence self- quenching characteristics,including static-quenching and dynamic-quenching,were revealed.Magnolol aggregation occurs with its concentration increases.On the other hand,the quenching rate constants produced by the monomer, dimmer,and trimer,kqm,kqd,and kqt,are much greater than those controlled by diffusion.It seems that other long-range energy migration should be taken into account besides the short-range electron exchange energy in the quenching mechanism.

关 键 词：厚朴酚 荧光自猝灭 聚集 猝灭速率常数 

分 类 号：O621.2[理学—有机化学]