CRCU

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (6): 857-861.

• Articles • Previous Articles     Next Articles

Crystal Structure and Solution Behavior of a Novel Enantiopure Helical Coordination Polymer Based on Binaphthyl-bisbipyridine Ligand

JIN Ri-zhe1, BIAN Zheng1, HE Ya-bing1,2 and GAO Lian-xun1*   

  1. 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
    2. Graduate School of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2010-05-12 Revised:2010-07-23 Online:2010-11-25 Published:2010-12-01
  • Contact: GAO Lianxun E-mail:lxgao@ciac.jl.cn
  • About author: GAO Lian-xun. E-mail: lxgao@ciac.jl.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.20502024).

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Abstract: An enantiopure helical coordination polymer AgPF6·(R)-3 as crystalline solid was synthesized by the self-assembly of chiral binaphthyl-based ligand (R)-6,6'-di[6-(2,2'-bipyridyl)]-2,2'-diethoxyl-1,1'-binaphthalene [(R)-3] and Ag+ ion. The single crystal structural analysis indicates that this polymer exhibits an infinite cylindric single-stranded M-helical structure with local Λ configuration at each tetrahedral metal center. However, the extended structure is dissociated into some oligomeric fragments in solution. The 1H NMR spectra of complex AgPF6·(R)-3 show that the ligand possesses a good C2 symmetry, and the chemical shifts of the protons depend on the concentration and temperature. In addition, there are rapid dynamic exchanges among some oligonuclear fragments in the solution of AgPF6·(R)-3.

Key words: Helical structure, Binapthyl, Silver, Chiral ligand, Solution behaviour