Synthesis And Luminescence Properties Of Lanthanide Complexes With Polydentate Schiff Base Ligands

In this thesis,five new Schiff base ligands were synthesized fr om the reactions of o-vanillin and 2,4-dichlorobenzaldehyde with o-henylenediamine,4-methylbenze-1,2-diamine,[2,2’-bipyridine]-4,4’-diamine and 4,4’-(（propane-2,2-diylbis（4,1-phenylene））bis（oxy）diphe nylamine.These Schiff base ligands were characterized by ¹H NMR spectra,and their purities are more than 95%.The reactions of the se ligands with different 3d-metal and lanthanide salts result in vari ous 4f and d-4f complexes.The crystal structures of fifteen lanthani de-based complexes in five series were determined by X-ray diffract ometry.Meanwhile,they were characterized by thermogravimetry,po wder diffraction,scanning electron microscopy and X-ray energy dis persion spectroscopy.These lanthanide-based complexes are:（i）chir al layer-like tri-nuclear lanthanide complexes{Ln₃},Ln=Nd（1）,Yb（2）and Ho（3）;（ii）layer-like tri-nuclear Cd-Ln complexes{Cd Ln₂},Ln=Nd（4）,Yb（5）,Sm（6）and Ho（7）;（iii）sandwich-shap ed tri-nuclear Cd-Ln complexes{Cd₂Ln},Ln=Nd（8）and Yb（9）;（iv）planar tri-nuclear Zn-Ln complexes{Zn₂Ln},Ln=Nd（10）,Yb（11）,Ce（12）and Dy（13）;（v）planar hexanuclear Zn-Ln compl exes{Zn₂Ln₄},Ln=Nd（14）,Yb（15）.The study of luminescence properties shows that,the Schiff base ligands in the complexes can effectively transfer light energy to lanthanide ions,resulting in the near-infrared luminescence of the complexes.Further investigate exh ibits that complexes 1,5,9,10,14 and 15 show interesting lumine scent response to metal cations,anions and explosives.