作者:Janina A. Rosso、Patricia E. Allegretti、Daniel O. Mártire、Mónica C. Gonzalez
DOI:10.1039/a807751g
日期:——
The aqueous phase reactions of α,α,α-trifluorotoluene (TFT) with sulfate and phosphate radicals have been investigated by conventional flash-photolysis. The bimolecular rate constants obtained for the reactions of SO4Ëâ, H2PO4Ë, HPO4Ëâ and PO4Ë2â with TFT are (2 ± 1) Ã 107, (3.5 ± 0.5) Ã 107, (2.7 ± 0.5) Ã 106 and (9 ± 1) Ã 105Mâ1 sâ1, respectively. The organic radicals produced from these reactions exhibit a common absorption peak at 290â300 nm. Additionally, the transients generated from sulfate radicals show a shoulder at 360â370 nm and those generated from phosphate radicals a less intense maximum at 400 nm. Based on the experimental results, the nature of the organic radicals is discussed. Additional information on the hydroxycyclohexadienyl radicals of TFT is obtained from independent experiments with hydrogen peroxide solutions containing TFT.
通过传统的闪烁光解法研究了δ,δ,δ-三氟甲苯(TFT)与硫酸根和磷酸根的水相反应。SO4Ëâ、H2PO4Ë、HPO4Ëâ和PO4Ë2â与TFT反应的双分子速率常数分别为(2 ± 1) 107、(3.5 ± 0.5) 107、(2.7 ± 0.5) 106和(9 ± 1) 105Mâ1 sâ1。这些反应产生的有机自由基在 290300 nm 处显示出共同的吸收峰。此外,硫酸根自由基产生的瞬态吸收峰在 360â370 nm 处出现肩峰,磷酸根自由基产生的瞬态吸收峰在 400 nm 处出现强度较低的最大值。根据实验结果,讨论了有机自由基的性质。关于 TFT 的羟基环己二烯自由基的更多信息,可从含有 TFT 的过氧化氢溶液的独立实验中获得。