Synthesis And Luminescent Response Of Polynuclear Lanthanide Complexes With Schiff Base Ligands

In this thesis,five new Schiff base ligands were synthesized from the reactions of o-vanillin and 3,5-dichlorosalicylaldehyde with different diamines.These Schiff base ligands were characterized by ¹H NMR spectra.Nine lanthanide complexes in five series were synthesized from the reactions of these Schiff base ligands and metal salts,including a one-dimensional chain-like coordination polymer[Sm?HL¹?₂?NO₃?]_n?1?,two mono-nuclear lanthanide complexes[Ln L²?HL²?]?Ln=Sm?2?,La?3??,three tetra-nuclear Cd-Ln complexes[Cd₂Ln₂?L³?₂?OAc?₂?OH?₄?CH₃OH?₂]?Ln=Yb?4?,Nd?5?,La?6??,two tetra-nuclear Cd-Ln complexes[Cd₂Ln₂?L⁴?₂?OAc?₄?OH?₄]?Ln=Nd?7?,Dy?8??,and one tetra-nuclear lanthanide complex[Nd₄?L⁵?₄?OH?₄?DMF?₂]?9?.Their single crystal structures were determined by X-ray diffractometry.Meanwhile,they were characterized by XRD powder diffraction,TGA and UV-vis absorption spectrum.Their luminescence properties,as well as the luminescent response of coordination polymer 1 and complexes 7,were investigated.The results indicate that,1 exhibits both ligand-and lanthanide-centered fluorescent response to metal ions,especially to Co²⁺with high sensitivity.Meanwhile,7 shows interesting luminescent sensing phenomenon to anions and nitro explosives,especially to H₂PO₄^-and 2,4,6-trinitrotoluene?PA? at ppm level.