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Citation: ZHANG An-Yun, LI Kai, HE Hui, HU Jing-Xin, ZHANG Xian-Ye, WANG Fang-Ding. Kinetics and Mechanism of Redox Reaction Between N,N-Dimethylhydroxylamine and Vanadium(Ⅴ)[J]. Chinese Journal of Applied Chemistry, ;2001, 18(3): 180-183. shu

Kinetics and Mechanism of Redox Reaction Between N,N-Dimethylhydroxylamine and Vanadium(Ⅴ)

1.
a Department of Chemistry, Shaanxi Normal University, Xi'an 710062;
2.
b China Institute of Atomic Energy, Beijing

Received Date: 20 June 2000
Available Online: 8 November 2000
Fund Project: 国家"九五"重点科技攻关项目(Y5551) (Y5551)核工业科学基金课题(H7196No123) (H7196No123)

The kinetics and mechanism of the redox reaction between N,N-dimethylhydroxylamine (DMHA) and vanadium (Ⅴ) in nitric acid medium at 25.2℃ have been studied by spectrophotometry.By investigating the influences of the DMHA concentration,solutio acidity and reaction temperature on the reaction,the reaction rate equation is found to be-d[V (Ⅴ)]/dt=k[V(Ⅴ)][DMHA] where the k is calculated to be (9.95±1.0) L²/(mol²·s),ΔE=22.1 kJ/mol under experiment conditions.A single-electron transfer mechanism has been suggested based on the ESR results of (CH₃)₂NO radical.The following reaction is the rate controlling step:[HO-V-O…H…O-N (CH₃)₂]²⁺→(CH₃)₂NO+H₂O+VO²⁺
- N,N-dimethylhydroxylamine,
- vanadium (Ⅴ),
- reaction kinetics,
- mechanism
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