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通过制备型高效液相色谱分离获得了Tb@C_(82)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C_(2v)和C_s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.电化学研究表明,C_(82)碳笼的对称性对Tb@C_(82)的还原过程的影响较小,而对其氧化过程影响较大.Tb@C_(82)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@C_(2v)(9)-C_(82)相比,Tb@Cs(6)-C_(82)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@C_(2v)(9)-C_(82)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.
The two isomers of Tb @ C_ (82) were isolated by preparative HPLC and their C_ (2v) and C_s symmetry were deduced from their UV-Vis-NIR absorption spectra Structure, and Tb is embedded in the carbon cage in a +3 valence state.The electrochemical studies show that the symmetry of the C_ (82) cage has little effect on the reduction of Tb @ C_ (82) The oxidation process of Tb2C_ (82) is more effective than that of Tb @ C_ (2v) (9) -C_ The higher redox potential of Tb @ Cs (6) -C_ (82) implies that the latter possesses better electron accepting ability than the former (82) In addition, we have observed that Tb @ ) - C_ (82) seven pairs of reversible oxidation-reduction potential, enrich and correct the results reported previously.