Radiolytic reduction of ethylene trithiocarbonate: A pulse radiolysis study

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 DOI:10.1016/1359-0197(92)90218-5

S.P. Ramnani , P.K. Bhattacharyya , S. Dhanya

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Abstract

The reaction of e^-_aq with ethylene trihiocarbonate in aqueous medium has been investigated employing pulse radiolysis technique. The bimolecular rate constant for the reaction has been obtained as 3×10¹⁰dm³mol⁻¹s⁻¹. A transient absorption spectrum, with λ_max at 315 nm, has been observed which is assigned to the neutral radical formed by the protonation of radical anion produced in the reaction of e^-_aq with ETTC. A similar absorption spectrum was also observed under the condition where the H atom instead of e^-_aq reacts with ETTC. The transient decayed by second-order kinetics with k₂=(9.1±1.0) ×10⁸ dm³ mol⁻¹ s⁻¹. The G(-ETTC) has been determined from ⁶⁰Co λ-radiolysis as 3.1.

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三硫代碳酸乙烯的辐射还原:脉冲辐射分解研究

采用脉冲辐射解法研究了e-aq与三碳酸乙烯在水溶液中的反应。该反应的双分子速率常数为3×1010dm3mol−1s−1。e-aq与ETTC反应产生的自由基阴离子质子化形成中性自由基，在315 nm处有λmax的瞬态吸收光谱。在以H原子代替e-aq原子与ETTC反应的条件下，也观察到类似的吸收光谱。瞬态衰减为二阶动力学，k2=(9.1±1.0)×108 dm3 mol−1 s−1。G(-ETTC)由60Co λ-放射性溶解测定为3.1。

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International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry

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