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利用瞬态吸收光谱技术研究了C6H5F与亚硝酸在355nm光作用下的交叉反应机制,探讨了反应体系中的瞬态粒子及其动力学行为,并借助GC-MS确定了终产物.实验结果表明,单氟苯与亚硝酸光解产生的OH自由基发生反应的二级反应速率常数为(5.83±0.17)×109L.mol-1.s-1.中间产物C6H5F…OH加合物与亚硝酸的反应是其主要衰减通道,二级反应速率常数为(8.02±0.08)×107L.mol-1.s-1.C6H5F…OH加合物还可发生脱水反应产生单氟苯自由基,但未发生脱氟反应.分析表明终产物有单氟苯酚、硝基单氟苯、硝基单氟苯酚、对氟联苯.
Transient absorption spectroscopy was used to study the cross-reaction mechanism of C6H5F with nitrous acid at 355 nm. The transient particles in the reaction system and their kinetic behavior were investigated. The final product was confirmed by GC-MS. , The second-order reaction rate constant for the reaction of monofluorobenzene with OH radicals generated by nitrous acid photolysis was (5.83 ± 0.17) × 109L.mol-1.s-1. The intermediate C6H5F ... OH adduct reacted with nitrous acid Of the reaction is its main channel of attenuation, the second-order reaction rate constant (8.02 ± 0.08) × 107L.mol-1.s-1.C6H5F ... OH adduct can also occur dehydration reaction monofluorobenzene free radicals, but not Defluorination reaction occurred.The analysis showed that the final product monofluorophenol, nitrofurfuryl, nitrofurfuryl, parafluorobiphenyl.