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The transient absorption spectrum technique was employed to investigate the cross-reaction mecha-nism of C6H5F-HNO2 aqueous solution irradiated at 355 nm. The characteristic and the kinetic parame-ters of transient species were also detected. Hydroxyl radical derived from the photolysis of HNO2 was added to monofluorobenzene with a second-order rate constant of (5.83±0.17)×109 L·mol-1·s-1 to form an adduct, C6H5F···OH, which was able to react with HNO2 as the main reaction pathway with a rate constant of (8.3±0.1)×107 L·mol-1·s-1. The C6F6···OH adduct can also be decayed by elimination of H2O to yield monofluorophenyl radical C6H4F·. By GC-MS technique, the final products were identified to be monofluorophenol, nitro-monofluorobenzene, nitro-monofluorophenol and para-fluorobiphenyl.
The transient absorption spectrum technique was employed to investigate the cross-reaction mecha-nism of C6H5F-HNO2 aqueous solution irradiated at 355 nm. The characteristic and the kinetic parame-ters of transient species were also detected. Hydroxyl radical derived from the photolysis of HNO2 was added to monofluorobenzene with a second-order rate constant of (5.83 ± 0.17) × 109 L · mol -1 · s-1 to form an adduct, C6H5F ··· OH, which was able to react with HNO2 as the main reaction The pathway with a constant rate of (8.3 ± 0.1) × 107 L · mol-1 · s-1. The C6F6 ··· OH adduct can also be decayed by elimination of H2O to yield monofluorophenyl radical C6H4F ·. By GC-MS technique , the final products were identified to be monofluorophenol, nitro-monofluorobenzene, nitro-monofluorophenol and para-fluorobiphenyl.