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Citation: Han Hua, Yuan Wei-Feng, Ruan Wen-Juan, Zhao Xiao-Jing, Hu Guo-Hang, Zhu Zhi-Ang. Study on the Molecular Recognition of New Chiral Salen Zn(II) Binuclear Complexes[J]. Acta Physico-Chimica Sinica, ;2004, 20(05): 529-534. doi: 10.3866/PKU.WHXB20040517 shu

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

1.
Department of Chemistry, Nankai University, Tianjin　300071

Received Date: 31 October 2003
Available Online: 15 May 2004

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