Kinetics of reactions of primary, secondary and tertiary β-hydroxy peroxyl radicals
作者:Michael E. Jenkin、Garry D. Hayman
DOI:10.1039/ft9959101911
日期:——
The UV absorption spectra and kinetics of reactions of the primary, secondary and tertiary β-hydroxy peroxyl radicals HOCH2CH2O2, CH3CH(OH)CH(O2)CH3 and (CH3)2C(OH)C(O2)(CH3)2 at or near 298 K have been studied using both the molecular modulation (MM) and the laser flash photolysis (LFP) techniques. The radicals were produced by the UV photolysis (254 or 248 nm) of mixtures containing H2O2 and one
β,羟基和叔羟基伯羟基HOCH 2 CH 2 O 2,CH 3 CH(OH)CH(O 2)CH 3和(CH 3)2 C(OH)的紫外吸收光谱和反应动力学已经使用分子调制(MM)和激光闪光光解(LFP)技术研究了298 K或附近的C(O 2)(CH 3)2。自由基是由含有H 2 O 2和一种对称单烯烃乙烯(E的混合物)的UV光解(254或248 nm)产生的。)-丁-2-烯和2,3-二甲基丁-2-烯,在空气中稀释。发现CH 3 CH(OH)CH(O 2)CH 3和(CH 3)2 C(OH)C(O 2)(CH 3)2的光谱与以前对HOCH 2 CH的测量非常相似2 ø 2,具有的最大横截面CA。245 nm处4×10 –18 cm 2分子–1。在高单烯烃浓度下,观察到的过氧自由基(RO 2)的二级去除提供了k 3obs的值对于HOCH 2 CH 2 O 2,CH 3 CH(OH)CH(O 2)CH