Kinetics and Mechanisms of the Self-Reactions of CCl<sub>3</sub>O<sub>2</sub> and CHCl<sub>2</sub>O<sub>2</sub> Radicals and Their Reactions with HO<sub>2</sub>
作者:Valéry Catoire、Robert Lesclaux、William F. Schneider、Timothy J. Wallington
DOI:10.1021/jp960572z
日期:1996.1.1
trends in the reactivity of chloromethyl peroxy radicals are discussed. As part of this work, the following reaction rate constants were measured (units of cm3 molecule-1 s-1) at room temperature: k(CCl3O2 + CH3O2) = (6.6 ± 1.7) × 10-12, k(Cl + CHCl3) = (1.1 ± 0.1) × 10-13, k(Cl + CH2Cl2) = (3.5 ± 0.4) × 10-13, k(Cl + CHClO) = (7.0 ± 1.0) × 10-13, and k(F + CHCl3) = (5.4 ± 1.5) × 10-12.
反应的动力学和机理CCl 3 O 2 + CCl 3 O 2 →2CCl 3 O + O 2(1),CHCl 2 O 2 + CHCl 2 O 2 →2CHCl 2 O + O 2(2a),CHCl 2 O 2 + CHCl 2 O 2 →CHCl 2 OH + CCl 2 O + O 2(2b),CCl 3 O 2 + HO 2 →产物(3)和CHCl 2 O 2 + HO在总压力为700-760托时,研究了2 →产物(4)与温度的关系。使用了两种补充技术:用于动力学测量的快速光解/紫外吸收和用于最终产品分析的连续光解/ FTIR光谱。在220至280nm之间测定CHCl 2 O 2和CCl 3 O 2的紫外吸收光谱;它们的形状类似于其他烷基过氧自由基,但具有较宽和较弱的谱带。由氯原子在氯原子引发的氯原子氧化链中CCl 2 O的形成速率确定速率常数k 1在273和460 K之间,其中反应1是限速步骤;k