富勒烯自旋调控
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- 英文论文题名：Electron Spin Manipulation of Metallofullerenes
- 论文作者：王春儒 ; 王太山 ; 吴波
- 英文论文作者：Chunru Wang ; Taishan Wang ; Bo Wu ; Institute of Chemistry ; Chinese Academy of Sciences
- 年：2016
- 作者机构：中国科学院化学研究所;
- 论文关键词：金属富勒烯 ; 分子陀螺 ; 自旋调控
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十九分会：纳米碳材料
- 语种：中文
- 分类号：O613.71
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十九分会 ; 纳米碳材料
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：174k
- 原文格式：D
- 会议级别：全国
摘要
金属富勒烯独特的结构使其内部活泼的化学集团能够被碳笼所保护,我们研究了Sc_3C_2@C_(80)中的电子自旋对弱磁场的响应特性,发现金属富勒烯笼内的电子自旋共振(ESR)信号对笼外的氮氧自由基顺磁体具有灵敏的感应,氮氧自由基可以作为顺磁性金属富勒烯的分子磁开关,控制金属富勒烯自旋信号的开和关。我们还开展了针对金属内嵌富勒烯分子的超快动力学机理研究。通过选取一类典型的金属内嵌富勒烯分子Sc_2C_2@C_(82),采用飞秒时间分辨的超快光谱测量技术,系统考察了该类分子异构体和衍生物的可见光激发电子动力学行为,首次发现了该分子体系中三线态通道的开启与富勒烯碳笼对称性以及笼外修饰分子基团电子特性之间的高度关联性,进而揭示出"光学暗态"在操控其光激发电子动力学演化中的决定性作用
The endohedral fullerenes lead to well-protected internal species by the fullerene cages, and even highly reactive radicals can be stabilized. However, the manipulation of the magnetic properties of these radicals from outside remains challenging. Here we report a system of a paramagnetic metallofullerene Sc_3C_2@C_(80) connected to a nitroxide radical, to achieve the remote control of the magnetic properties of the metallofullerene. The remote nitroxide group serves as a magnetic switch for the electronic spin resonance(ESR) signals of Sc_3C_2@C_(80) via spin-spin interactions. Briefly, the nitroxide radical group can "switch off" the ESR signals of the Sc_3C_2@C_(80)moiety. Moreover, the strength of spin–spin interactions between Sc_3C_2@C_(80) and the nitroxide group can be manipulated by changing the distance between these two spin centres. In addition, the ESR signals of the Sc_3C_2@C_(80) moiety can be switched on at low temperatures through weakened spin-lattice interactions.
The endohedral fullerenes lead to well-protected internal species by the fullerene cages, and even highly reactive radicals can be stabilized. However, the manipulation of the magnetic properties of these radicals from outside remains challenging. Here we report a system of a paramagnetic metallofullerene Sc_3C_2@C_(80) connected to a nitroxide radical, to achieve the remote control of the magnetic properties of the metallofullerene. The remote nitroxide group serves as a magnetic switch for the electronic spin resonance(ESR) signals of Sc_3C_2@C_(80) via spin-spin interactions. Briefly, the nitroxide radical group can "switch off" the ESR signals of the Sc_3C_2@C_(80)moiety. Moreover, the strength of spin–spin interactions between Sc_3C_2@C_(80) and the nitroxide group can be manipulated by changing the distance between these two spin centres. In addition, the ESR signals of the Sc_3C_2@C_(80) moiety can be switched on at low temperatures through weakened spin-lattice interactions.
引文
[1]Wu Bo,et al.,,Molecular magnetic switch for a metallofullerene,Nature Commun.,2015,6,1-6
[1]Wu Bo,et al.,,Visible-Light Photoexcited Electron Dynamics of Scandium Endohedral Metallofullerenes:The Cage Symmetry and Substituent Effects,J.Am.Chem.Soc.,2015,137,8769-8774。
[1]Wu Bo,et al.,,Visible-Light Photoexcited Electron Dynamics of Scandium Endohedral Metallofullerenes:The Cage Symmetry and Substituent Effects,J.Am.Chem.Soc.,2015,137,8769-8774。