Isolation and Electrochemical Property of Tb@C82 Isomers

doi:10.6023/A17030090

Acta Chim. Sinica ›› 2017, Vol. 75 ›› Issue (5): 453-456.DOI: 10.6023/A17030090 Previous Articles Next Articles

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Tb@C₈₂异构体的分离及其电化学性质研究

董薇, 聂梦思, 廉永福

黑龙江大学化学化工与材料学院功能无机材料化学教育部重点实验室哈尔滨 150080

投稿日期:2017-03-04 发布日期:2017-05-24
通讯作者: 廉永福 E-mail:chyflian@hlju.edu.cn
基金资助:
项目受国家自然科学基金（Nos.21271067，51572071）和教育部高校创新团队计划（No.IRT-1237）资助.

Isolation and Electrochemical Property of Tb@C₈₂ Isomers

Dong Wei, Nie Mengsi, Lian Yongfu

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

Received:2017-03-04 Published:2017-05-24
Contact: 10.6023/A17030090 E-mail:chyflian@hlju.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21271067, 51572071) and the Program for Innovative Research Team in University (No. IRT-1237), Ministry of Education, China.

1. Isolation and Electrochemical Property of Tb@C₈₂ Isomers.PDF(269KB)

Abstract

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 C₈₂cage 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.

Key words: metallofullerene, terbium, isomer, electrochemistry, redox potential

Cite this article

Dong Wei, Nie Mengsi, Lian Yongfu. Isolation and Electrochemical Property of Tb@C₈₂ Isomers[J]. Acta Chim. Sinica, 2017, 75(5): 453-456.

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Tb@C₈₂异构体的分离及其电化学性质研究

Isolation and Electrochemical Property of Tb@C₈₂ Isomers

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Tb@C82异构体的分离及其电化学性质研究