金属富勒烯[Dy@C_(82)(I)]膜的电化学研究  

Electrochemical Study on Metallofullerene [Dy@C_(82)(I)] Films

作　　者：范楼珍[1] 吴月芹[1] 杨尚峰[2] 杨世和[2] 

机构地区：[1]北京师范大学化学系,北京100875 [2]香港科技大学化学系

出　　处：《化学学报》2004年第22期2213-2217,共5页Acta Chimica Sinica

基　　金：国家自然科学基金 (No .2 0 4 730 1 4 )资助项目

摘　　要：研究并对比了金属富勒烯Dy @C82 的主要异构体Dy @C82 (I)固体膜在有机溶剂乙腈及水溶液中的电化学性质 .在乙腈溶液中 ,Dy @C82 (I)膜的电化学行为不同于其溶于有机溶剂中的电化学行为 ,前两个还原峰与其对应的再氧化峰之间存在大的分裂 .但是 ,经过还原及再氧化后的Dy @C82 (I)膜却存在一对对称性很好的氧化及再还原峰 .解释为经过还原后的Dy @C82 (I)膜的结构有利于进一步氧化 ,而不需要结构重排 ;在水溶液中 ,Dy @C82 (I)膜的电化学行为不同于其在乙腈溶液中 ,却类似于其有机溶液在Pt电极上的电化学行为 ,出现了对称性很好的三对还原峰及一对氧化峰 .在水溶液中 ,Dy @ C82 (I)的前三价负离子及一价正离子是稳定的 .利用紫外 -可见 -近红外 (UV Vis NIR)光谱及扫描电镜 (SEM)The electrochemical properties of the major isomer of Dy@C 82[Dy@C 82(I)] films have been studied in organic and aqueous solutions. In acetonitrile solution, the electrochemical behavior of Dy@C 82(I) film is different from that of Dy@C 82(I) dissolved in organic solution. Large splittings between reduction and reoxidation waves for the first and the second electron-transfer reactions were observed. However, a pair of reversible oxidation and rereduction waves was obtained after the reoxidation of a reduced film, which is interpreted as the favorable structure after reduction of the film and no structural reorganization was needed. In aqueous solution, the electrochemical properties of Dy@C 82(I) film are similar with those of Dy@C 82(I) dissolved in organic solutions, where the first three reversible reduction and reoxidation waves and the first oxidation and rereduction waves were obtained. In water, Dy@C 82(I) -, Dy@C 82(I) 2-, Dy@C 82(I) 3- and Dy@C 82(I) + were found to be stable. The characteristic of this film was also uncovered by UV-Vis-NIR spectra and scanning electron microscopy (SEM), etc.

关 键 词：金属富勒烯 电化学 Dy@C82(Ⅰ)]膜 紫外-可见-近红外光谱 扫描电镜 表面形貌 

分 类 号：O613.71[理学—无机化学]