Ditopic Chelating Chiral Pyridine Ligands for Metallogrids and Helicates
雙配位模式螫合手性吡啶配體的配位金屬網絡和螺旋體
Student thesis: Doctoral Thesis
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Detail(s)
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| Award date | 31 Aug 2021 |
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| Permanent Link | https://scholars.cityu.edu.hk/en/theses/theses(e1501e4e-149f-4ffb-955a-4028ac12803e).html |
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| Other link(s) | Links |
Abstract
The use of ditopic chelating chiral pyridine ligands in supramolecular chemistry has been of great interest . This thesis reports the use of ditopic chelating chiral pyridine ligands for formation of different types of supramolecular assemblies.
Chapter 1 is an introduction section. Literature examples are reviewed. In chapter 2, one new ditopic chelating chiral pyridine ligand is formed and characterized by NMR technique. The self-assembly of Zn(II) with HL1 in a ratio of 1 to 1 gives one tetranuclear metallogrid complex, 1, which has been successfully characterized by ESI-MS, elemental analysis, NMR and X-ray diffraction analysis. Complex 2 and 3 are reported previously by Kwong’s group.They are also zinc metallgrid complexes formed by different ditopic chelating chiral pyridine ligand HL.We also explore the catalytical application of complex 1, 2 and 3 in ring opening of epoxides with amines. The products’ ee value has also been determined by HPLC.
In chapter 3, two kinds of 2,2’-bipyridine-containing ligands L2 and L3 are synthesized and characterized by NMR. The reaction of the ligands with Ag+ or Co2+ afford binuclear double-stranded helicates. The NMR spectra and x ray structures of the helicates are studied in detail.
Chapter 1 is an introduction section. Literature examples are reviewed. In chapter 2, one new ditopic chelating chiral pyridine ligand is formed and characterized by NMR technique. The self-assembly of Zn(II) with HL1 in a ratio of 1 to 1 gives one tetranuclear metallogrid complex, 1, which has been successfully characterized by ESI-MS, elemental analysis, NMR and X-ray diffraction analysis. Complex 2 and 3 are reported previously by Kwong’s group.They are also zinc metallgrid complexes formed by different ditopic chelating chiral pyridine ligand HL.We also explore the catalytical application of complex 1, 2 and 3 in ring opening of epoxides with amines. The products’ ee value has also been determined by HPLC.
In chapter 3, two kinds of 2,2’-bipyridine-containing ligands L2 and L3 are synthesized and characterized by NMR. The reaction of the ligands with Ag+ or Co2+ afford binuclear double-stranded helicates. The NMR spectra and x ray structures of the helicates are studied in detail.
