A series of Eu( Ⅲ )/Y( Ⅲ ) complexes of terephthalic acid(TPA) with 2-thenoyltrifluoroacetone(HTTA) and trioctylphosphine oxide(TPPO) were synthesized. Compositions of these complexes are revealed to be Eu2(1-x)Y2x(...A series of Eu( Ⅲ )/Y( Ⅲ ) complexes of terephthalic acid(TPA) with 2-thenoyltrifluoroacetone(HTTA) and trioctylphosphine oxide(TPPO) were synthesized. Compositions of these complexes are revealed to be Eu2(1-x)Y2x(TPA)(TTA)4- (TPPO)4 or Eu1-xYx(TPA)(TTA)(TPPO)2. Their IR spectra, fluorescent spectra and the thermal and optical stability were studied. The fluorescent excitation spectra of these complexes show more broad excitation bands than those of Eu2(TPA)3(TPPO)4 and Eu(TTA)3(TPPO)2 corresponding to their formations. In addition, both the binuclear complex EuY(TPA)(TTA)4(TPPO)4 and the chain complex Eu0.4Y0.6(TPA)(TTA)(TPPO)2 present higher thermal stability and better optical stability than the mononuclear complex Eu(TTA)3(TPPO)2 does. And their thermal and optical stabilities are preferably interpreted from the binuclear structure together with the chain polynuclear structure of the complexes. The fluorescence enhancement of cofluorescence Y3+ ions to the Eu(Ⅲ) complexes is clear. The optimum content of Y3+ is 0.6 (molar fraction) for the chain complexes Eu1-xYx(TPA)(TTA)- (TPPO)2 and 0.5 for the binuclear complexes Eu2(1-x)Y2x(TPA)(TTA)4(TPPO)4. The formation of polynuclear structure of the complex Eu1-xYx(TPA)(TTA)(TPPO)2 appears to be responsible for the good cofluorescence effect of Y3+ ions.展开更多
Rare earth market rose holistically recently. However, there was no improvement in phosphor market yet. The market of europium oxide, terbium oxide and yttrium oxide was still weak.
A novel Eu^3＋ rare earth complex, composed of 4 - hydroxybenzolate acid and 1, 10 - phenanthroline ligands was synthesized. The apparent morphology, composition, thermal stability and fluorescent property of the rare...A novel Eu^3＋ rare earth complex, composed of 4 - hydroxybenzolate acid and 1, 10 - phenanthroline ligands was synthesized. The apparent morphology, composition, thermal stability and fluorescent property of the rare earth complex were measured by TEM, Element analysis, IR, TG and Fluorescence spectrometer. The results indicated that this rare earth complex has sphere-like morphology and its diameter was about 100 nm. The complex has good thermal stability due to the strong coordination between the Eu^3＋ ions and the ligands. Based on the composition analysis, the complex structure formula was： Eu （HOC6 H4 COI）3 （phen） ·H2O Fluorescence spectra showed that the rare earth complex emission peaks were corresponding to the transition of ^5D0→7FJ（J=0,1,2,4）,. and the highest intensity fluorescence peak was at 617 nm. The luminescent fiber was prepared by blending melt-spinning with rare earth complex and polypropylene resin. It also has a good luminescent quality, which the strongest emission peak was at 619 nm. It could be considered suitable for industrial application.展开更多
In recent years, a great deal of interest has been focused on nitrogen-containing extractants for the separation of actinides from lanthanides. In this study, we synthesized a polyazamacrocycle-type C8-cyclen ligand c...In recent years, a great deal of interest has been focused on nitrogen-containing extractants for the separation of actinides from lanthanides. In this study, we synthesized a polyazamacrocycle-type C8-cyclen ligand comprising four tertiary alkyl amino groups, for the extraction of Am3+ and Eu3+. The C8-cyclen demonstrated a weak ability to extract and separate Am3+ and Eu3+ that increased with the increasing "softness" of the aqueous anions. The extraction behavior of Am3+ and Eu3+ indicated coordination interactions between the C8-cyclen and the Am3+ and Eu3+ ions. The suppression of Am3+ or Eu3+ extraction by acid depended on the media anions involved.展开更多
基金Project(20576142) supported by the National Natural Science Foundation of ChinaProject(05B075) supported by the Foundation of Hunan Education Bureau for Young Scholars, China
文摘A series of Eu( Ⅲ )/Y( Ⅲ ) complexes of terephthalic acid(TPA) with 2-thenoyltrifluoroacetone(HTTA) and trioctylphosphine oxide(TPPO) were synthesized. Compositions of these complexes are revealed to be Eu2(1-x)Y2x(TPA)(TTA)4- (TPPO)4 or Eu1-xYx(TPA)(TTA)(TPPO)2. Their IR spectra, fluorescent spectra and the thermal and optical stability were studied. The fluorescent excitation spectra of these complexes show more broad excitation bands than those of Eu2(TPA)3(TPPO)4 and Eu(TTA)3(TPPO)2 corresponding to their formations. In addition, both the binuclear complex EuY(TPA)(TTA)4(TPPO)4 and the chain complex Eu0.4Y0.6(TPA)(TTA)(TPPO)2 present higher thermal stability and better optical stability than the mononuclear complex Eu(TTA)3(TPPO)2 does. And their thermal and optical stabilities are preferably interpreted from the binuclear structure together with the chain polynuclear structure of the complexes. The fluorescence enhancement of cofluorescence Y3+ ions to the Eu(Ⅲ) complexes is clear. The optimum content of Y3+ is 0.6 (molar fraction) for the chain complexes Eu1-xYx(TPA)(TTA)- (TPPO)2 and 0.5 for the binuclear complexes Eu2(1-x)Y2x(TPA)(TTA)4(TPPO)4. The formation of polynuclear structure of the complex Eu1-xYx(TPA)(TTA)(TPPO)2 appears to be responsible for the good cofluorescence effect of Y3+ ions.
文摘Rare earth market rose holistically recently. However, there was no improvement in phosphor market yet. The market of europium oxide, terbium oxide and yttrium oxide was still weak.
基金Supported by the Innovation Fund of Donghua University for Doctors
文摘A novel Eu^3＋ rare earth complex, composed of 4 - hydroxybenzolate acid and 1, 10 - phenanthroline ligands was synthesized. The apparent morphology, composition, thermal stability and fluorescent property of the rare earth complex were measured by TEM, Element analysis, IR, TG and Fluorescence spectrometer. The results indicated that this rare earth complex has sphere-like morphology and its diameter was about 100 nm. The complex has good thermal stability due to the strong coordination between the Eu^3＋ ions and the ligands. Based on the composition analysis, the complex structure formula was： Eu （HOC6 H4 COI）3 （phen） ·H2O Fluorescence spectra showed that the rare earth complex emission peaks were corresponding to the transition of ^5D0→7FJ（J=0,1,2,4）,. and the highest intensity fluorescence peak was at 617 nm. The luminescent fiber was prepared by blending melt-spinning with rare earth complex and polypropylene resin. It also has a good luminescent quality, which the strongest emission peak was at 619 nm. It could be considered suitable for industrial application.
基金supported by the National Natural Science Foundation of China(91226110)the Program for Changjiang Scholars and Innovative Research Team in University
文摘In recent years, a great deal of interest has been focused on nitrogen-containing extractants for the separation of actinides from lanthanides. In this study, we synthesized a polyazamacrocycle-type C8-cyclen ligand comprising four tertiary alkyl amino groups, for the extraction of Am3+ and Eu3+. The C8-cyclen demonstrated a weak ability to extract and separate Am3+ and Eu3+ that increased with the increasing "softness" of the aqueous anions. The extraction behavior of Am3+ and Eu3+ indicated coordination interactions between the C8-cyclen and the Am3+ and Eu3+ ions. The suppression of Am3+ or Eu3+ extraction by acid depended on the media anions involved.
