Ditopic Chelating Chiral Pyridine Ligands for Metallogrids and Helicates


Student thesis: Doctoral Thesis

View graph of relations


Related Research Unit(s)


Awarding Institution
Award date31 Aug 2021


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.