Studies On Synthesis And Fluorescent Properties Of Long Chain Conjugated β-diketone Rare Earth Ternary Complexes

β-diketone rare earth complexes have always attracted mang attentions in coordination chemistry and rare earth luminescent materials.And it is demonstrated that the complexes may be widely applied in analytic chemistry ,medicine,life science,fluorescent probe and luminescent devices for their special luminescene mechanism and good luminescene properties. In this dissertation, ten new ternary rare earth complexes and four new binary rare earth complexes were obtained by the reaction of rare earth chloride with fourβ-diketone ligands and 1,10-Phenanthroline （Phen）. The fluorescence properties of fourteen rare earth complexes were characterized by means of fluorescent spectra. The effect of the excited state energies of these ligands on fluorescence properties of the complexs was disscused by the method of quantum chemistry calculation. The main works in this dissertation are as follows:1. A newβ-diketone ligand 1- （p-phenylethynylphenyl）-1,3-butanedione （HPB） were synthesized in this paper. Its composition and structure was characterized by elemental analysis, IR, 1HNMR and MS.2. Four new binary rare earth complexes: Sm（PB）₃.2H₂O, Eu（PB）₃.3H₂O, Tb（PB）₃.2H₂O and Dy（PB）₃.3H₂O were obtained by the reaction of rare earth chloride RECl3 （RE= Sm、Eu、Tb、Dy） with 1- （p-phenylethynylphenyl）-1,3-butanedione （HPB） in alcohol solution. The composition and heat stability of the complexes were characterized by means of elemental analysis, IR, and TG-DSC.3. Four new ternary rare earth complexes RE（PB）3Phen were obtained by the reaction of rare earth chloride RECl3 （RE= Sm、Eu、Tb、Dy） with 1- （p-phenylethynylphenyl）-1,3- butanedione （HPB） and 1,10 -Phenanthroline in alcohol solution. The composition and heat stability of the complexes were characterized by means of elemental analysis, IR, and TG-DSC.4. Two ternary rare earth complexes RE（PPP）₃Phen were synthesized by the reaction of rare earth chloride RECl₃（RE= Sm, Dy） with 1- pheny -3-（p-pheny lethynylpheny l） -1,3-propanedione and 1,10-Phenanthroline in alcohol solution. The composition and heat stability of the complexes were characterized by means of elemental analysis, IR, and TG-DSC.5. Two ternary rare earth complexes RE（TPP）₃Phen were synthesized by the reaction of rare earth chloride RECl₃（RE= Sm, Dy） with 1-（2-thienyl） -3-（p-pheny lethynylpheny l） -1,3-propanedione and 1,10-Phenanthroline in alcohol solution. The composition and heat stability of the complexes were characterized by means of elemental analysis, IR, and TG-DSC.6. Two ternary rare earth complexes RE（FPP）₃Phen were synthesized by the reaction of rare earth chloride RECl₃ （ RE=Sm, Dy ） with 1-（2-furyl）-3-（p-phenylethynyl）-1,3- propanedi-oneand1,10-Phenanthroline in alcohol solution. The composition and heat stability of the complexes were characterized by means of elemental analysis, IR, and TG-DSC7. Fluorescence properties of the ternary rare earth complexs have been studied by fluorescent spectra. The results show that Eu （Ⅲ） complexes exhibit strong fluorescent emittion, which demonstrate the triplet state energies of these ligands match well with the excited state energies of rare earth ions Eu³⁺ , and the absorbing energy by these ligands can effectively transfer to Eu³⁺. However, the （Tb, Sm, Dy） complexes only emit weaker fluorescence of rare earth ions, which show the triplet state energies of these ligands not match well with the excited state energies of rare earth ion.8. Fluorescence properties of the binary rare earth complexes have been studied with fluorescent spectra. It shows that the fluorescent intensity of the Eu （Ⅲ）complexes is the strongest of the four binary complexes, this again indicates the triplet state energies of this ligand match well with the excited state energies of rare earth ions Eu³⁺ , and the absorbing energy by this ligands can effectively transfer to Eu³⁺.9. The effect of the excited state energies of these ligands on fluorescence properties of the complexs was disscused by the method of quantum chemistry calculation.