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本文用电化学方法研究了硫在 DMSO 溶剂中第一步氧化还原过程的机理,发现这个过程不是一个简单的双电子过程,提出了更为合理的 EEC 机理,数字模拟也表明该机理是可能的,并从2.5次微分谱上发现了 S_6~(2-)的氧化峰,其峰电位为-0.29V(相对于银电极).计算得该体系的某些动力学参数值为:α_1=0.5,β_2=0.25,K°_(f1)=8.2×10~(-5)cm·s~(-1),k°_(b2)=3.5×10~(-5)cm·s~(-1)(电位零点-0.851V)D_(s_8)=5.6×10~(-6)cm~2·s~(-1),D_(s_6~(2-))=8.4×10~(-6)cm~2·s~(-1).
Electrochemical method was used to study the mechanism of the first redox process of sulfur in DMSO solvent. It was found that this process is not a simple two-electron process, and a more reasonable EEC mechanism was proposed. Numerical simulation also shows that this mechanism is possible , And the oxidation peak of S_6 ~ (2-) was found from the 2.5th differential spectrum with a peak potential of -0.29V (relative to the silver electrode). Some kinetic parameters of the system were calculated as: α_1 = 0.5 , β_2 = 0.25, K ° _ (f1) = 8.2 × 10 -5 cm · s -1, k ° b 2 = 3.5 × 10 -5 cm · s -1, 1) (potential zero point -0.851V) D s_8 = 5.6 × 10 -6 cm ~ 2 · s -1, D_ (s_6 ~ 2) = 8.4 × 10 ~ (-6) ) cm ~ 2 · s ~ (-1).