t—BuNO二聚体在不同溶剂中裂解机理的研究

本文利用＾１ＨＮＭＲ，ＵＶ－Ｖｉｓ方法，研究了ｔ－ＢｕＮＯ二聚体在有机溶剂及水溶液中的裂解反应产物，分析了其反应的动力学，提出了在非极性的有机相中ｔ－ＢｕＮＯ二聚体为均裂反应，而在极性的水相中为均裂和异裂同时进行的竞争反应。     

胞嘧啶水溶液体系辐解的瞬态产物研究

Using the ns pulse radolysis, we studied the characteristic absorption spectrum and kinetic decay of cytosine anion radical (Cyt-). Results showed that the characteristic absorption of Cyt- was located at λ=355±5 nm, and decayed following the first order kinetics with τ1/2=265 ns at pH=7.0. The decay became slower and τ1/2 rapidly rised with the increment of pH value, Cyt- protonated at C6 in acidic solution, and the characteristic absorption was located at λ=310±5 nm, and decayed following the second order kinetics: Cyt- protonated at N3 in aqueous solution of pH≥7, and the characteristic absorption was located at λ=295±5 nm, and decayed following the second order kinetics.     

N2O饱和胞嘧啶水溶液体系辐解的瞬态产物研究

在确定胞嘧啶阴离子自由基特征吸收的基础上，采用脉冲辐解技术，以Ｎ２ＯＲ ｅ＾－ａｑ的清除剂对Ｃｙｔ水溶液进行了研究。实验结果显示：在不存在自由ｅ＾－ａｑ条件下仍产生了Ｃｙｔ的两个特征吸收峰，即位于λｍａｘ＝３３５±５ｍｍ处的Ｃｙｔ－吸收峰和其质子化产物的吸收峰。