物理化学学报 >> 2004, Vol. 20 >> Issue (05): 529-534.doi: 10.3866/PKU.WHXB20040517

研究论文 上一篇    下一篇

新型手性Salen双核锌配合物的分子识别研究

韩华;袁伟锋;阮文娟;赵小菁;胡国航;朱志昂   

  1. 南开大学化学系,天津　300071
  • 收稿日期:2003-10-31 修回日期:2004-01-16 发布日期:2004-05-15
  • 通讯作者: 阮文娟 E-mail:wjruan@nankai.edu.cn

Study on the Molecular Recognition of New Chiral Salen Zn(II) Binuclear Complexes

Han Hua;Yuan Wei-Feng;Ruan Wen-Juan;Zhao Xiao-Jing;Hu Guo-Hang;Zhu Zhi-Ang   

  1. Department of Chemistry, Nankai University, Tianjin　300071
  • Received:2003-10-31 Revised:2004-01-16 Published:2004-05-15
  • Contact: Ruan Wen-Juan E-mail:wjruan@nankai.edu.cn

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摘要： 合成了新型手性Salen配体（H3L）及新型手性Salen双核锌配合物（主体）.通过研究主体对咪唑类客体及氨基酸酯类客体的分子识别行为，测定了这些配位反应的缔合常数.主体对咪唑类客体分子识别的缔合常数顺序为:K(Im) >K(2-MeIm) >K(2-Et-4-MeIm).主体对氨基酸酯类客体分子识别的缔合常数顺序为:K(LeuOCH3) >K(ValOCH3) >K(AlaOCH3) >K(SerOCH3)，配位数均为2.主体与D、 L型氨基酸酯分子识别反应在不同温度下的缔合常数结果表明,随着温度的升高，对映选择性下降.实验发现反应体系中存在焓熵补偿关系. CD光谱的研究结果也反映了主体对不同客体识别能力的差异.

关键词: 手性Salen双核锌配合物, 分子识别, 圆二色光谱

Abstract: Chiral Salen ligand(H3L) and zinc(II) dinuclear complex(host) were synthesized, which were characterized by elemental analysis, 1H NMR, UV-Vis, FT-IR and CD spectra. Molecular recognition behavior of the host for imidazoles and amino acid esters was studied. The binding constants between host and guest were measured, and it shows that the binding constants decrease in the orders of K(Im) >K(2-MeIm) >K(2-Et-4-MeIm) (imidazoles) and K(LeuOCH3) >K(ValOCH3) >K(AlaOCH3) >K(SerOCH3) (amino acid esters), and the coordination number is 2. The enthalpy-entropy compensation existed in host-guest system. By studying the binding constants between the host and amino acid esters, we find that the enantiosel selectivity decreases as the temperature increases. The studies of circular dichroism spectra of hostguest system show that the recognition behavior is different for various guests.

Key words: Chiral Salen (N,N’-bis-(salicylaldehyde ethylenediimine)) zinc(II)dinuclear complex, Molecular recognition, 　Circular dichroism spectra