Synthesis,Luminescent Properties Of The Rare Earth Complexes Based On The Bifunctional Ligand Of Carboxyl And ?-diketo

As the rare earth element inner layer 4f has similar electronic energy levels and the outer electronic structure is the same,this unique electronic configuration makes the rare earth complex have many special chemical and physical properties,especially in light,electricity,magnetism and other aspects.The use of these features can produce many novel materials,which are regarded as the "treasure house" of new materials.Among them,luminescent rare earth complexes have good application prospects in fluorescent probes,anti-counterfeit materials and light energy conversion film because of their high luminous efficiency,good color purity and small environmental impact.At present,the most studied luminescent rare earth complexes are(3-diketone rare earth complexes and aromatic carboxylic acid rare earth complexes.Among them,?-diketone rare earth complexes have good luminescent properties,but the stability is not very good.The aromatic carboxylic acid rare earth complexes have better thermal stability,but the luminescent effect is slightly worse than that of ?-diketone rare earth complexes.There have been many reports of single ?-diketone rare earth complexes and single aromatic carboxylic acid rare earth complexes.However,rare earth luminescent complexes combining aromatic carboxylic acids with ?-diketone ligands are rarely reported.In particular,there are few reports on the complexes containing both ?-diketone and aromatic carboxyl in one ligand.In this dissertation,the advantages of P-diketones and aromatic carboxylic acid ligands are combined organically.The rare-earth complexes containing both ?-diketone and aromatic carboxyl bifnctional ligand were designed and synthesized.In this dissertation,a series of luminescent rare earth complexes were synthesized using 4-[(1,3-dioxobutyl)amino]benzoic acid as the main ligand and 1,10-phenanthroline and 4,4'-bipyridyl as auxiliary ligands.The composition of the complexes was characterized and the structure was speculated,in addition their fluorescence properties were tested.The main content of this thesis is divided into two parts:1.A series of rare earth binary complexes[Ln2(L)3(H2O)4]n(Ln = Sm,Eu,Dy,Tb).were synthesized by solution method using 4-[(1,3-dioxobutyl)amino]benzoic acid as the ligand.The complexes were characterized by elemental analysis(EA),molar conductance,infrared spectrum(IR)and thermogravimetric analysis(TG).The composition of the series of complexes was preliminarily determined and the possible structures were deduced.In addition,the fluorescence properties of binary rare earth complexes of Sm,Eu,Tb,and Dy in the visible region have also been studied.2.A series of rare earth ternary complexes[Ln2(NO3)2(L)2(Phen)2]n(Ln = Sm,Eu,Dy,Tb)and[Ln2(NO3)2(L)2(Bipy)2]n(Ln = Sm,Eu,Dy,Tb)were synthesized by solution method using 4-[(1,3-dioxobutyl)amino]benzoic acid as main ligand,with 1,10-phenanthroline and 4,4'-bipyridine as auxiliary ligands respectively.The complexes were characterized by elemental analysis(EA),molar conductance,infrared spectrum(IR)and thermogravimetric analysis(TG).The composition of the complexes was preliminarily determined and the possible structures were deduced.In addition,the fluorescence properties of Sm,Eu,Tb,and Dy ternary rare earth complexes in the visible region have also been studied.