影像科学与光化学 ›› 1996, Vol. 14 ›› Issue (1): 27-31.DOI: 10.7517/j.issn.1674-0475.1996.01.27

• 研究论文 • 上一篇    下一篇

竹红菌素在DMF-H2O混合体系中的电化学研究

王维波, 李学萍, 安静仪, 肖绪瑞   

  1. 中国科学院感光化学研究所, 北京100101
  • 收稿日期:1995-06-08 修回日期:1995-09-01 出版日期:1996-02-20 发布日期:1996-02-20
  • 通讯作者: 王维波

ELECTROCHEMICAL INVESTIGATION OF HYPOCRELLIN IN DMF-H2O MIXED SYSTEM

WANG Weibo, LI Xueping, AN Jingyi, XIAO Xurui   

  1. Institute of Photographic Chemistry, The Chinese Academy of Sciences, Beijing 100101, P. R. China
  • Received:1995-06-08 Revised:1995-09-01 Online:1996-02-20 Published:1996-02-20

摘要: 本文研究了竹红菌素HA,HB以及13-SO3Na-DDHA在DMF-H2O(体积分数φ=1)混合体系中的电化学氧化还原性质。结果表明,它们都为两步单电子还原过程,反应机理为:HA,HB:HA(HB)+e+H+⇔HAH·(HBH·)+e⇔HAH·油溶性。水溶性13-SO3Na-DDHA:(第一步)13-SO3Na-DDHA+e⇔13-SO3Na-DDHA(质子化)13-SO3Na-DDHA+H+⇔13-SO3Na-DDHAH·;(第二步)13-SO3Na-DDHAH·+e⇔13-SO3Na-DDHAH.并且,HA,HB的单电子还原半醒自由基非常稳定,而13-SO3Na-DDHA单电子还原半醌自由基存在歧化反应,其速率常数kf=0.408.

关键词: 竹红菌素, 电化学, 竹红菌素半醌自由基, 歧化反应

Abstract: The dectrochemical redox characteristics of hypocrellin A,B and 13-SO3Na-DDHA in DMF-H2O(φ=1)-mixed system were investigated.The results show/that that all correspond to two step one-electron reduction processes.For oil-soluble system HA and HB,the reactions are HA(HB)+e+H+=HAH·(HBH·)+e=HAH(HBH);for water-soluble system 13-SO3Na-DDHA,the reactions are(the first step)13-SO3NA-DDHA+e=13-SO3Na-DDHA,(protonatbn)13-SO3Na-DDHA+H+=13-SO3Na-DDHAH·,(the second step)13-SO3Na-DDHA·+e=13-SO3Na-DDHA·,respectively.And it was found that hypocrellin A,B semiquinone radical is very stable,while hypocrellin A sulfonate semiquinone radical is not very stable with a rate constant of disproportionation kf=0.408.

Key words: hypocrellin, electrochemistry, hypocrellin semiquinone, disproportionation