基于瞬态吸收光谱的2,3-二氨基吩嗪动力学研究

The Kinetic Study of 2,3-diaminophenazine Based on the Transient Absorption Spectroscopy

瞬态吸收光谱是研究分子的光诱导动力学的重要方法之一,为探究分子光物理、光化学和光生物反应过程提供了良好研究平台。本工作旨在利用瞬态吸收光谱展开对2,3-二氨基吩嗪(DAP)分子溶解在甲苯(TOL)和四氢呋喃(THF)溶剂中的动力学过程进行系统研究。实验结果表明,DAP在甲苯中可以实现单线态向三线态转移的过程,而在THF中没有三线态形成,这是由于溶剂的极性差异造成的。通过对纳秒瞬态光谱中吸收信号的动力学拟合和飞秒瞬态吸收动力学的全局拟合,我们得到DAP在甲苯溶液中单线态向三线态转移的时间大约是2.42ns。此外,并通过对DAP甲苯溶液除氧和通氧实验,我们直接证明了三线态的存在,也表明DAP的三线态可以与氧气发生能量转移从而生成单线态氧。

Transient absorption spectroscopy is one of the important methods to study the photoinduction kinet-ics of molecules,which provides a good research platform for exploring the photophysical,photochemical and photobiological reaction processes of molecules.This work aims to systematically investigate the kinetic process of dissolution of 2,3-diaminophenazine(DAP)molecules in toluene(TOL)and tetrahydrofuran(THF)sol-vents using transient absorption spectroscopy.The experimental results show that DAP can realize the process of singlet to triplet in toluene,while there is no trilet formation in THF,which is caused by the polarity difference of the solvent.By fitting the dynamics of the absorption signal in the nanosecond transient spectrum and the glob-al fitting of the femtosecond transient absorption kinetics,we obtain that the transition time of DAP from singlet to triplet state in toluene solution is approximately 2.42 ns.In addition,through the deoxygenation and oxygen-ation experiments of DAP toluene solution,we directly prove the existence of trilets,and also show that the trip-let states of DAP can be transferred with oxygen to generate singlet oxygen.