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电化学(中英文) ›› 1997, Vol. 3 ›› Issue (4): 371-377. 

• 研究论文 • 上一篇    下一篇

加成基团对富勒烯电化学性质的影响

范楼珍,李永舫,郑大贵,李玉良,朱道本   

  1. 中国科学院化学研究所
  • 收稿日期:1997-11-28 修回日期:1997-11-28 出版日期:1997-11-28 发布日期:1997-11-28

Effect of Addition Groups on the Redox Properties of Fullerenes

Fan Louzhen Li Yongfang Zheng Dagui Li Yuliang Zhu Daoben   

  1. (Insti. of Chem., The Chinese Academy of Sinences, Beijing 100080)
  • Received:1997-11-28 Revised:1997-11-28 Published:1997-11-28 Online:1997-11-28

摘要: 采用循环伏安法和微分脉冲伏安法对比地研究了包括五种C60的衍生物及四种C70的衍生物的电化学性质.结果表明,推电子基团的引入使得富勒烯的氧化还原电位负移,这种负移的程度与加成基团的性质、个数和富勒烯的性质有关.对于C60和C70的单加成产物,负移的范围是0.08~0.20V.而对于C60的双加成和三加成产物负移的范围分别为0.30~0.32V和0.53~0.58V.同时由于电位的负移大部分衍生物在低于+1.5V(vs.SCE)观察到了氧化峰,而C60和C70本身的氧化高达+1.7V(vs.SCE).特别是对于C70的双加成产物在+0.45V(vs.SCE)出现了一个不可逆氧化峰,但是,对于同样加成基团的C60双加成产物的氧化却在+0.90V(vs.SCE),说明由于推电子基团的双加成引入,明显改变了C70的电负性.

关键词: 富勒烯, 电化学性质, 循环伏安

Abstract: Electrochemical properties of fullerene derivatives, including five C60 derivatives and four C70 derivatives, were studied systematically and comparatively by cyclic voltammetry and differential pulse wave voltammetry. The addition of the electrondonating groups on the fullerenes caused negative shift of the redox potentials of the fullerenes. The extent of the negative shift depends on the number and properties of the addition groups, and on the nature of the fullerenes. 0.08~0.20 V negative shift was observed for C60 and C70 monoadducts, 0.30~0.32 V for bisadduct and 0.53~0.58 V for triadduct of C60. Meanwhile, the oxidation waves of most of these derivatives appeared on their cyclic voltammograms. Particularly, an irreversible oxidation of the C70 bisadduct took place at +0.45 V (vs. SCE), while that of C60 bisadduct was at +0.90 V (vs. SCE), indicating that the electronegativity of C70 was greatly reduced by the bisaddition of the electrondonating groups.

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