中国物理B ›› 2012, Vol. 21 ›› Issue (5): 56801-056801.doi: 10.1088/1674-1056/21/5/056801

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Stabilization variation of organic conductor surfaces induced by π–π stacking interactions

窦瑞芬1,林峰2,刘富伟1,孙祎1,杨继勇1,林炳发1,何林1,熊昌民1,聂家财1   

  1. 1. Department of Physics, Beijing Normal University, Beijing 100875, China;
    2. School of Physics, State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China
  • 收稿日期:2011-12-27 修回日期:2012-04-27 出版日期:2012-04-01 发布日期:2012-04-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10804010, 50772015, 60977015, and 10974019), the National Basic Research Program of China (Grant No. 2006CB932301), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars of Ministry of Education.

Stabilization variation of organic conductor surfaces induced by $\pi$-$\pi$ stacking interactions

Dou Rui-Fen(窦瑞芬)a), Lin Feng(林峰)b), Liu Fu-Wei(刘富伟)a), Sun Yi(孙祎)a), Yang Ji-Yong(杨继勇)a), Lin Bing-Fa(林炳发)a), He Lin(何林)a), Xiong Chang-Min(熊昌民)a), and Nie Jia-Cai(聂家财)a)†   

  1. a. Department of Physics, Beijing Normal University, Beijing 100875, China;
    b. School of Physics, State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China
  • Received:2011-12-27 Revised:2012-04-27 Online:2012-04-01 Published:2012-04-01
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 10804010, 50772015, 60977015, and 10974019), the National Basic Research Program of China (Grant No. 2006CB932301), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars of Ministry of Education.

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摘要： The structures and stabilization of three crystal surfaces of TCNQ-based charge transfer complexes (CTCs) including PrQ(TCNQ)2, MPM(TCNQ)2, and MEM(TCNQ)2, have been investigated by scanning tunneling microscopy (STM). The three bulk-truncated surfaces are all ac-surface, which are terminated with TCNQ molecular arrays. On the ac-surface of PrQ(TCNQ)2, the TCNQ molecules form a tetramer structure with a wavelike row behavior and a γ angle of about 18° between adjacent molecules. Moreover, the dimer structures are resolved on both ac-surfaces of MPM(TCNQ)2 and MEM(TCNQ)2. In addition, the tetramer structure is the most stable structure, while the dimer structures are unstable and easily subject to the STM tip disturbance, which results in changeable unit cells. The main reasons for the surface stabilization variation among the three ac-surfaces are provided by using the '$\pi$-atom model'.

关键词: charge transfer complex (CTC), scanning tunneling microscopy (STM),  $\pi$-$\pi$  stacking interaction, stabilization

Abstract: The structures and stabilization of three crystal surfaces of TCNQ-based charge transfer complexes (CTCs) including PrQ(TCNQ)2, MPM(TCNQ)2, and MEM(TCNQ)2, have been investigated by scanning tunneling microscopy (STM). The three bulk-truncated surfaces are all ac-surface, which are terminated with TCNQ molecular arrays. On the ac-surface of PrQ(TCNQ)2, the TCNQ molecules form a tetramer structure with a wavelike row behavior and a $\gamma$ angle of about 18° between adjacent molecules. Moreover, the dimer structures are resolved on both ac-surfaces of MPM(TCNQ)2 and MEM(TCNQ)2. In addition, the tetramer structure is the most stable structure, while the dimer structures are unstable and easily subject to the STM tip disturbance, which results in changeable unit cells. The main reasons for the surface stabilization variation among the three ac-surfaces are provided by using the '$\pi$-atom model'.

Key words: charge transfer complex (CTC), scanning tunneling microscopy (STM), π--&pi, stacking interaction, stabilization

中图分类号:  (Scanning tunneling microscopy (including chemistry induced with STM))

  • 68.37.Ef
82.45.Jn (Surface structure, reactivity and catalysis) 82.75.Fq (Synthesis, structure determination, structure modeling)