Kinetics and mechanism of oxidation of 3,6-dioxa-1,8-octanedithiol and dl-dithiothreitol by a platinum(IV) complex

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• 作者：Yuyan Lu ; Xiaonan Hou ; Xiaowei Zhao ; Mengyu Liu ; Fugang Shen…
• 刊名：Transition Metal Chemistry
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：41
• 期：1
• 页码：45-55
• 全文大小：1,404 KB
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• 作者单位：Yuyan Lu (1)
  Xiaonan Hou (1)
  Xiaowei Zhao (1)
  Mengyu Liu (1)
  Fugang Shen (1)
  Yuanyuan Ren (1)
  Yunxiao Liu (1)
  Shuying Huo (1)
  Shigang Shen (1)
  
  1. College of Chemistry and Environmental Science, the Key Laboratory of Analytical Science and Technology of Hebei Province, and the MOE Key Laboratory of Medicinal Chemistry and Molecular Diagnostics, Hebei University, Baoding, 071002, Hebei Province, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Inorganic Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-901X

文摘

A Pt(IV) complex [PtCl₂(en)(heda)]Cl₂ (heda = N-(2-hydroxyethyl)-ethylenediamine) has been synthesized and characterized by ESI–MS, 1H NMR, elemental analysis, and X-ray crystal structure analysis. Oxidations of dithiol compounds 3,6-dioxa-1,8-octanedithiol (DODT) and dl-dithiothreitol (DTT) by this complex were studied. The oxidation products were characterized as ten- and six-membered ring compounds for DODT and DTT, respectively, both containing an intramolecular disulfide bond. The kinetics of the oxidation reactions was followed by stopped-flow spectrophotometry over a wide pH range. The oxidations display an overall second-order character, being first-order each in [Pt(IV)] and in [dithiol]. A mechanism involving three parallel rate-determining steps is proposed, and the rate constants of the rate-determining steps have been evaluated.