Does bromine atom-free radical (Br·) undergo a chemical reaction before dimerization to dibromine (Br2)? An electrochemical investigation

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• 作者：Muhammad Tariq ; M. Mohammad ; I. A. Tahiri…
• 关键词：Bromine atom ; free radical Br· ; Dimerization ; Cyclic voltammetry ; DNA components simulation of CV
• 刊名：Journal of the Iranian Chemical Society
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：13
• 期：2
• 页码：279-287
• 全文大小：1,700 KB
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• 作者单位：Muhammad Tariq (1) (2)
  M. Mohammad (2)
  I. A. Tahiri (3)
  A. Dar (2)
  
  1. National Center of Excellence in Physical Chemistry, University of Peshawar, Peshawar, 25120, Pakistan
  2. Reactive Intermediates-Free Radical Chemistry Group, HEJ Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
  3. Chemistry Department Federal Urdu University of Science and Technology, Karachi, 75270, Pakistan
  
• 刊物主题：Analytical Chemistry; Inorganic Chemistry; Physical Chemistry; Biochemistry, general; Organic Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：1735-2428

文摘

The important question, does bromine atom free radical, Br·, undergo a chemical reaction with a substrate before it dimerizes to dibromine Br₂, is investigated through electrochemical oxidation of bromide ion Br−. Cyclic voltammetry and spectrophotometry were used as electro-oxidation and monitoring devices. Simulation of cyclic voltammogram was used to obtain information about the mechanism of electro-oxidation process as well as reaction with substrates. It is shown that the primary electro-oxidation product (PEOP) of Br−, Br· (bromine atom-free radical), reacts with chemicals like chloroform, glycine, cytosine, etc. It can also dimerize, for example in acetonitrile. Reactions of PEOP Br· with substrate chloroform, acetone, DNA components adenine, cytosine, thymine and amino acid glycine were studied and their kinetics are reported here. Keywords Bromine atom-free radical Br· Dimerization Cyclic voltammetry DNA components simulation of CV