Synthesis,Structure And Properties Of Coordination Complexes Based On Zwitterionic Pyridine Ligands

The rational design and syntheses of coordination complexes based on zwitterionic pyridine ligands continue to attract enormous interest because of the endless possibilities and inexhaustible synthesis options for tailoring their structures and properties. In this thesis,26 new complexes have been obtained by using six different zwitterionic pyridine ligands(L1-L6) to react with metal ions. They have been characterized by single-crystal X-ray analysis, IR spectroscopy, powder X-ray diffraction. Including:1. Six new highly symmetrical and isostructural 3D lanthanide coordination complexs and one mixed coordination complex based on Li have been successfully synthesized and fully characterized. The complex 1 was utilized as a representative chemsensor to detect small molecules, cations and anions, respectively. Interestingly,1 exhibited dual-functional detection of Pb2+ and Fe3+ ions in ethanol. In additon, the temperature-dependent luminescence properties of 1,2 and 7 have also been investigated systematically, which demonstrated that both 1 and 7 have the potential to quantitatively detect temperature over a wide range from 10-300 K for 1 and 10-170 K for 7.2. Using zwitterionic pyridine ligands(L1-L4) to combine with 4,4’-bpy ligand, eight new d10 metal coordination complexs are obtained. All of those eight complexs have been characterized.12 was chosen as a representative and could be applied as the first potential dual-functional luminescent sensing material for high selective and recyclable sensing of 2,4,6-trinitrophenol and quantitatively detecting the ultralow temperature from 10 to 60K.3. Using zwitterionic pyridine ligands(L3 and Ls) to combine with cyan group, two new coordination complexs are obtained.16 exhibited a high sensitivity for Fe3+ in DMF solution of mixed metal ions, which makes it a promising crystalline material to be a luminescent probe for Fe3+ ion. In addition, the temperature-dependent luminescence property of 16 exhibited it has the potential to serve as the first example of a dual-functional luminescent sensor for quantitatively detecting the temperature (10-90 K) and selectively sensing Fe3+ ion in DMF solution.4. Using zwitterionic pyridine ligands(L1, L4, L3 and L6) to combine with transition metal ions (Cu2+, Co2+, Mn2+, Zn2+ and Cd2+). nine zero-dimensional and one-dimensional transition metal complexes have been obtained. In addition, two new two-dimensional compounds were synthesized by utilizing imidazole as template. All of those eleven complexs have been characterized. Besides, the magnetic studies show that very weak antiferromagnetic couplings exist in 25.