Sythesis, Characterization And Studies On Fluorescence Property Of Rare Earth With Azatriphenylenes Complexes

Aβ-dione ligand: 1-phenyl-3-biphenyl-1,3-dione and three azatriphenylenes ligands: dipyrido[3,2-a:2',3'-c]quinoxaline(dpq),6,7-dicyano-dipyrido[3,2-a : 2',3'-c]quinoxaline(dcdpq),dipyrido[3,2-a: 2',3'-c] phenazine(dppz) were synthesized. Using 1,10-phenanthroline,dipyrido[3,2-a:2',3'-c]quinoxaline(dpq),6,7-dicyano-dipyrido[3,2-a:2',3'-c]quinoxaline(dcdpq),dipyrido[3,2-a:2',3'-c] phenazine(dppz) as the second ligands, sodium benzoate,phenoxyacetic acid,dibenzoylmethane (HDBM) and 1-phenyl-3-biphenyl-1,3-dione (HPBPD) as the first ligands thirty-four rare earth complexes were synthesized.Elemental analysis, rare earth coordination titration and TG-DTA studies show that the complexes have the composition of RE(C₆H₅COO)₃L(RE³⁺=Sm³⁺,Eu³⁺,Tb³⁺,Dy³⁺; L=phen,dpq,dcdpq,dppz); Eu_0.5Ln_0.5(C₆H₅COO)₃dpq(Ln³⁺=La³⁺,Gd³⁺); RE(POA)₃L·1/2H₂O(RE³⁺=Eu³⁺,Tb³⁺; L=phen,dpq,dppz); RE(DBM)₃L (RE³⁺=Eu³⁺,Tb³⁺; L=phen,dpq,dcdpq,dppz); RE(PBPD)₃L·1/2H₂O(RE³⁺=Sm³⁺, Eu³⁺,Tb³⁺,Dy³⁺; L=phen,dpq,dppz). The molar conductivity indicates that all the complexes are none-lectrolyte; IR spectra and UV spectra show that the azatriphenylenes through the N atoms of the phenanthroline moiety and sodium benzoate,phenoxyacetic acid,HDBM,HPBPD through oxygen atoms coordinate with RE³⁺ ions,respectively. Fluorescence spectra indicate that the fluorescence intensity of the series Tb³⁺ complexes are much higher than of the Eu³⁺ complexes of carboxylic acid,but the fluorescence intensity of the series Eu³⁺ complexes are much higher than of the Tb³⁺ complexes ofβ-dione. Fluorescence lifetime shows that the complexes of stronger fluorescence intensity have longer decay time.