Citation: Dong Wei, Nie Mengsi, Lian Yongfu. Isolation and Electrochemical Property of Tb@C₈₂ Isomers[J]. Acta Chimica Sinica, ;2017, 75(5): 453-456. doi: 10.6023/A17030090 shu

Isolation and Electrochemical Property of Tb@C₈₂ Isomers

Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080

Corresponding author: Lian Yongfu, chyflian@hlju.edu.cn
Received Date: 4 March 2017

Figures(4)

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 rotary 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 C_2v and C_s 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 recorded in a 0.1 mol/L ortho-dichlorobenzene (o-DCB) solution of tetrabutylammonium hexafluorophosphate (TBAPF₆) by referring the ferrocene/ferrocenium couple (Fc/Fc⁺). The working electrode and the counter electrode were platinum wires, and the reference one was a Ag/AgCl 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 symmetry 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 accepting 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 reversible reductive and one pair of reversible oxidative peaks were initially detected for Tb@C₈₂ (Ⅰ), offering more information on the electrochemistry of metallofullerene.
- metallofullerene,
- terbium,
- isomer,
- electrochemistry,
- redox potential
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Isolation and Electrochemical Property of Tb@C₈₂ Isomers