中文摘要：

通过制备型高效液相色谱分离获得了Tb@C82的两种同分异构体，依据它们的UV-Vis-NIR吸收光谱推断它们分别具有Q2v和C8对称性的碳笼结构，而且Tb是以＋3价的形态内嵌于碳笼中的．电化学研宄表明，C82碳笼的对称性对Tb@C82的还原过程的影响较小，而对其氧化过程影响较大．Tb@C82的两种异构体的第一还原电位都比较高，是较好的电子受体材料；而且与Tb@C2v（9）-C82相比，Tb@C8（6）-C82氧化还原电位更高一些，说明后者比前者具有更好的接受电子能力．此外，我们观察到了Tb@C2v（9）-C82的七对可逆的氧化-还原电位，丰富并修正了前人报道的结果．

英文摘要：

Carbon soot containing terbium endohedral fullerenes was prepared by vaporizing a graphite rod filled with Tb4O7 and graphite powder in an electric arc-discharge chamber. After reflux extraction with 1,2,4-trichlorobenzene and ro- tary evaporation of solvent, the residue was ultrasonically dissolved in toluene. The obtained solution was filtered with a 0.2 μm PTFE film, and then subjected to a three-stage high-performance liquid chromatographic （HPLC） isolation process to achieve two individual isomers of Tb@C82. The successful isolation of Tb@C82 isomers was confirmed by matrix-assisted laser desorption time-of-flight mass spectrometry and analytical HPLC. According to their UV-Vis-NIR absorption spectra, the carbon cages of the isolated Tb@C82 isomers are estimated to be of C2v and C8 symmetry, respectively, and Tb atom is encapsulated in carbon cage at a valence state of ＋3. The cyclic voltammetry （CV） of the two Tb@C82 isomers was record- ed in a 0.1 mol/L ortho-dichlorobenzene （o-DCB） solution of tetrabutylammonium hexafluorophosphate （TBAPF6） by refer- ring the ferrocene/ferrocenium couple （Fc/Fc＋）. The working electrode and the counter electrode were platinum wires, and the reference one was a Ag/AgC1 electrode. Tb@C82 （I） exhibits two pairs of reversible oxidative and five pairs of reversible reductive peaks, and Tb@C82 （II） shows one reversible oxidative and six reversible reductive ones. It is found that the sym- metry of C82 cage has little effect on the reduction potentials but great effect on the oxidation potentials of Tb@C82 isomers. Moreover, the first reduction potential of both Tb@C82 isomers is relatively high, indicating that they are good electron ac- cepting materials. Additionally, the corresponding redox potentials of Tb@C82 （II） are relatively higher than those of Tb@C82 （I）, therefore it is concluded that Tb@C82 （II） is of better electron accepting ability than Tb@C82 （I）. In comparison with those reported previously, three pairs of revers