利用原位变温EPR研究富勒烯双体笼间的弱C―C键

doi:10.3866/PKU.WHXB201605092

物理化学学报 >> 2016, Vol. 32 >> Issue (8): 1929-1932.doi: 10.3866/PKU.WHXB201605092

利用原位变温EPR研究富勒烯双体笼间的弱C―C键

谭天¹,杨佳慧¹,朱春华²,王官武²,陈家富²,苏吉虎^1,*()

¹ 中国科学技术大学,合肥微尺度物质科学国家实验室,近代物理系,合肥230026
² 中国科学技术大学,合肥微尺度物质科学国家实验室,化学系,合肥230026

收稿日期:2016-03-22 发布日期:2016-07-29
通讯作者: 苏吉虎 E-mail:sujihu@ustc.edu.cn
基金资助:
国家重点基础研究发展规划项目（973）(2013CB921802)

AWeak Intercage C―C Bond in a [C₆₀]fullerene Dimer Studied by In situ Variable Temperature EPR Spectroscopy

Tian TAN¹,Jia-Hui YANG¹,Chun-Hua ZHU²,Guan-Wu WANG²,Jia-Fu CHEN²,Ji-Hu SU^1,*()

¹ Hefei National Laboratory for Physical Science at Microscale, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, P. R. China
² Hefei National Laboratory for Physical Science at Microscale, Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China

Received:2016-03-22 Published:2016-07-29
Contact: Ji-Hu SU E-mail:sujihu@ustc.edu.cn
Supported by:
The project was supported by the National Key Basic Research Program of China (973)(2013CB921802)

摘要/Abstract

摘要：

本文研究了(C₆₀)₂-[P(O)(OCH₃)]₂富勒烯双体内的笼间C―C键的热力学性质(该双体的结构详见文献, Chem. Commun. 2011, 47, 6111)。原位、变温电子顺磁共振波谱实验结果表明，该C―C键的键离解能(BDE)为72.4 kJ·mol^-1 (17.3 kcal·mol^-1)，仅约为常见氢键的两倍，或约为常见有机C―C键的五分之一。因此，该二聚体于较高温度时容易发生均裂反应，形成单体自由基；降温时又容易发生自由基聚合反应。基于该笼间C―C键所具有的这些热力学特性，我们对其可被用于制备有序的富勒烯分子元器件等材料作展开讨论。

关键词: C₆₀富勒烯双体, 笼间C―C键, 热力学性质, 键离解能, 电子顺磁共振波谱学

Abstract:

This work studied the thermodynamic properties of a single intercage C―C bond in a [C₆₀]fullerene dimer, (C₆₀)2-[P(O)(OCH₃)]₂, previously synthesized by Wang et al. (Chem. Commun. 2011, 47, 6111). Data obtained from in situ variable temperature electron paramagnetic resonance (EPR) indicated a relatively low bond dissociation enthalpy (BDE) for this bond of 72.4 kJ ·mol^-1 (17.3 kcal ·mol^-1). This value is only approximately twice that of a typical hydrogen bond, or one fifth of the values determined for bonds in diamond or saturated hydrocarbons. The application of this pre-synthesized dimer to the formation of aligned fullerenes is discussed.

Key words: [C₆₀]fullerene dimer, Singly intercage C―C bond, Thermodynamic property, Bond dissociation enthalpy, Electron paramagnetic resonance spectroscopy

谭天,杨佳慧,朱春华,王官武,陈家富,苏吉虎. 利用原位变温EPR研究富勒烯双体笼间的弱C―C键[J]. 物理化学学报, 2016, 32(8), 1929-1932. doi: 10.3866/PKU.WHXB201605092

Tian TAN,Jia-Hui YANG,Chun-Hua ZHU,Guan-Wu WANG,Jia-Fu CHEN,Ji-Hu SU. AWeak Intercage C―C Bond in a [C₆₀]fullerene Dimer Studied by In situ Variable Temperature EPR Spectroscopy[J]. Acta Phys. -Chim. Sin. 2016, 32(8), 1929-1932. doi: 10.3866/PKU.WHXB201605092

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201605092

https://www.whxb.pku.edu.cn/CN/Y2016/V32/I8/1929

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利用原位变温EPR研究富勒烯双体笼间的弱C―C键

AWeak Intercage C―C Bond in a [C₆₀]fullerene Dimer Studied by In situ Variable Temperature EPR Spectroscopy

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AWeak Intercage C―C Bond in a [C₆₀]fullerene Dimer Studied by In situ Variable Temperature EPR Spectroscopy