Series of complexes Eux Tb1-x(BA)3phen(0.01 B x B 0.50)were synthesized by co-precipitation method,BA was used as the carboxylic acid ligand and 1,10-phenanthroline was used as the electrically neutral ligand.The samp...Series of complexes Eux Tb1-x(BA)3phen(0.01 B x B 0.50)were synthesized by co-precipitation method,BA was used as the carboxylic acid ligand and 1,10-phenanthroline was used as the electrically neutral ligand.The samples were characterized by means of X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),thermal gravimetric analyses and differential scanning calorimetry(TG–DSC),ultraviolet and visible spectrophotometer absorption spectra,and photoluminescence spectra to study the structure,the energy absorption,the thermal,and luminescent properties of the rare earth complexes.The results show that the series rare earth organic complexes are well crystallized and show high thermal stability.The luminescent intensity of europium ion in the complexes increases as terbium ion transfers the absorbed energy to europium ion in the complexes.The emission of terbium ion at 545 nm is not quenched by europium ion but increases with the content of europium ion decreasing.When the x value is 0.01,the fluorescence intensity reaches the maximum as well as the emission intensity of terbium ions at 545 nm and europium ions at614 nm are almost equal.It realizes the co-luminescence phenomenon of terbium ion and europium ion.The series rare earth organic complexes with different colors can be obtained by adjusting the ratio of terbium ion and europium ion.展开更多
A series of rare earth complexes Tb_(1-x)Eu_x(MAA)_3phen(x=0.00, 0.01, 0.03, 0.05, 0.07, 0.09, 0.10, 0.30, and 0.50) were synthesized with MAA as the first ligand and phen as the second ligand. The complexes were char...A series of rare earth complexes Tb_(1-x)Eu_x(MAA)_3phen(x=0.00, 0.01, 0.03, 0.05, 0.07, 0.09, 0.10, 0.30, and 0.50) were synthesized with MAA as the first ligand and phen as the second ligand. The complexes were characterized by means of FT-IR, thermogravimetry-differential scanning calorimetry (TG-DSC), XRD, UV absorption spectra, and photoluminescence spectra (PL). The results show that the luminescence intensity of Eu^(3+)increases as Tb^(3+) transfer the absorbed energy to Eu^(3+) in the complexes. The emission of Tb^(3+) at 545 nm is observed and increasing with x decreasing. When x=0.01, the luminescence intensity reaches the maximum value, and the emission intensity of Tb 3+ at 545 nm and Eu^(3+) at 614 nm are almost equal. It realizes the co-luminescence of Eu^(3+) and Tb^(3+) . We can obtain complexes with different colors by adjusting the ratio of Eu^(3+) to Tb^(3+) .展开更多
A novel ligand, N,N＇-（2,6-pyridinedicarbonyl）bis[N-（carboxymethyl）] （Lj） was designed and synthesized starting from pyri- dine-2,6-dicarboxylic acid （I）. The ligand （L0 and ititermediate product （3） were c...A novel ligand, N,N＇-（2,6-pyridinedicarbonyl）bis[N-（carboxymethyl）] （Lj） was designed and synthesized starting from pyri- dine-2,6-dicarboxylic acid （I）. The ligand （L0 and ititermediate product （3） were characterized by 1H nuclear magnetic resonance （NMR）, Fourier transform infrared spectrometer （FT-IR） spectra and elemental analysis. Besides, four novel co-luminescence systems of Sm-La-pyridyl carboxylic acids： K4Sm（1-x）Lax（L1）C13T1H20, K12Sm2（1-x）La2x（L2）3 C16y2H2O, K6Sm20 xyLa2x（L3）C16-y3H：O and K4Sm（1-x）Lax（L4）Cl3y4H20 （x was the mole fraction of La（III） in the mixed ions, the value was 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, respectively; Yl, Y2, Y3, Y4 were plus integer） were studied, and the mechanism of fluorescence enhancement effect was discussed detailedly.展开更多
?6′ tetracarboxy 4,4′ bipyridine was synthesized and the luminescence enhancement of their Eu 3+ complexes by Gd 3+ was observed. The results indicate that the mechanism of enhancement is based on the f...?6′ tetracarboxy 4,4′ bipyridine was synthesized and the luminescence enhancement of their Eu 3+ complexes by Gd 3+ was observed. The results indicate that the mechanism of enhancement is based on the formation of a polymeric structure where Eu 3+ and Gd 3+ are linked together by the ligands, which favours the consequent transfer of absorbed energy along the polymeric chain through several ligands toward the Eu 3+ .展开更多
A highly sensitive fluorescence system of the europium gadolinium thenoyltrifluoroacetone tri(salicyloylaminoethyl)amine cetylpyridium bromide polyvinyl alcohol was established and the luminescence mechanism was ...A highly sensitive fluorescence system of the europium gadolinium thenoyltrifluoroacetone tri(salicyloylaminoethyl)amine cetylpyridium bromide polyvinyl alcohol was established and the luminescence mechanism was studied. The excitation and emission wavelengths were 362.5 nm and 613.1 nm respectively. Optimum concentrations of gadolinium, thenoyltrifluoroacetone (TTA), and tri(salicyloylaminoethyl) amine (TSA) were found at room temperature. The effects of surfactants cetylpyridium bromide (CPB) and polyvinyl alcohol (PVA) were also described. The fluorescence intensity varies linearly with the concentration of europium (Ⅲ) in the range 5.00×10 -11 ～6.00×10 -8 mol/L and 1.00×10 -7 ～9.21×10 -7 mol/L. The detection limit is down to 9.02×10 -12 mol/L. The standard addition method was used for the determination of europium in high purity yttrium oxide with satisfactory results.展开更多
Via the strategy of charge balance,one new pillared layered metal-organic framework [Zn2（TNB）（2-nim）]（H3TNB = 4,4？,4？？-nitrilotribenzoicacid,2-nim = 2-nitroimidazole）（1） was successfully synthesized based o...Via the strategy of charge balance,one new pillared layered metal-organic framework [Zn2（TNB）（2-nim）]（H3TNB = 4,4？,4？？-nitrilotribenzoicacid,2-nim = 2-nitroimidazole）（1） was successfully synthesized based on mixed ligands,where binuclear [Zn2（CO2）3]~＋ cluster-based cationic layers [Zn2（TNB）]~＋ are connected by deprotonated 2-nitroimidazole.Meanwhile,CO2 adsorption bahaviors and luminescent property of compound 1 were investigated.展开更多
基金supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), National Defense Fundamental Research of China (No. 6134502)Research and Innovation Program for College Graduates of Jiangsu Province (No. CXZZ12_0410)
文摘Series of complexes Eux Tb1-x(BA)3phen(0.01 B x B 0.50)were synthesized by co-precipitation method,BA was used as the carboxylic acid ligand and 1,10-phenanthroline was used as the electrically neutral ligand.The samples were characterized by means of X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FT-IR),thermal gravimetric analyses and differential scanning calorimetry(TG–DSC),ultraviolet and visible spectrophotometer absorption spectra,and photoluminescence spectra to study the structure,the energy absorption,the thermal,and luminescent properties of the rare earth complexes.The results show that the series rare earth organic complexes are well crystallized and show high thermal stability.The luminescent intensity of europium ion in the complexes increases as terbium ion transfers the absorbed energy to europium ion in the complexes.The emission of terbium ion at 545 nm is not quenched by europium ion but increases with the content of europium ion decreasing.When the x value is 0.01,the fluorescence intensity reaches the maximum as well as the emission intensity of terbium ions at 545 nm and europium ions at614 nm are almost equal.It realizes the co-luminescence phenomenon of terbium ion and europium ion.The series rare earth organic complexes with different colors can be obtained by adjusting the ratio of terbium ion and europium ion.
基金supported by the National Defense Fundamental Research of China(No.6134502-1)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)
文摘A series of rare earth complexes Tb_(1-x)Eu_x(MAA)_3phen(x=0.00, 0.01, 0.03, 0.05, 0.07, 0.09, 0.10, 0.30, and 0.50) were synthesized with MAA as the first ligand and phen as the second ligand. The complexes were characterized by means of FT-IR, thermogravimetry-differential scanning calorimetry (TG-DSC), XRD, UV absorption spectra, and photoluminescence spectra (PL). The results show that the luminescence intensity of Eu^(3+)increases as Tb^(3+) transfer the absorbed energy to Eu^(3+) in the complexes. The emission of Tb^(3+) at 545 nm is observed and increasing with x decreasing. When x=0.01, the luminescence intensity reaches the maximum value, and the emission intensity of Tb 3+ at 545 nm and Eu^(3+) at 614 nm are almost equal. It realizes the co-luminescence of Eu^(3+) and Tb^(3+) . We can obtain complexes with different colors by adjusting the ratio of Eu^(3+) to Tb^(3+) .
基金Project supported by the National Natural Science Foundation of China (21071152)
文摘A novel ligand, N,N＇-（2,6-pyridinedicarbonyl）bis[N-（carboxymethyl）] （Lj） was designed and synthesized starting from pyri- dine-2,6-dicarboxylic acid （I）. The ligand （L0 and ititermediate product （3） were characterized by 1H nuclear magnetic resonance （NMR）, Fourier transform infrared spectrometer （FT-IR） spectra and elemental analysis. Besides, four novel co-luminescence systems of Sm-La-pyridyl carboxylic acids： K4Sm（1-x）Lax（L1）C13T1H20, K12Sm2（1-x）La2x（L2）3 C16y2H2O, K6Sm20 xyLa2x（L3）C16-y3H：O and K4Sm（1-x）Lax（L4）Cl3y4H20 （x was the mole fraction of La（III） in the mixed ions, the value was 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, respectively; Yl, Y2, Y3, Y4 were plus integer） were studied, and the mechanism of fluorescence enhancement effect was discussed detailedly.
文摘?6′ tetracarboxy 4,4′ bipyridine was synthesized and the luminescence enhancement of their Eu 3+ complexes by Gd 3+ was observed. The results indicate that the mechanism of enhancement is based on the formation of a polymeric structure where Eu 3+ and Gd 3+ are linked together by the ligands, which favours the consequent transfer of absorbed energy along the polymeric chain through several ligands toward the Eu 3+ .
文摘A highly sensitive fluorescence system of the europium gadolinium thenoyltrifluoroacetone tri(salicyloylaminoethyl)amine cetylpyridium bromide polyvinyl alcohol was established and the luminescence mechanism was studied. The excitation and emission wavelengths were 362.5 nm and 613.1 nm respectively. Optimum concentrations of gadolinium, thenoyltrifluoroacetone (TTA), and tri(salicyloylaminoethyl) amine (TSA) were found at room temperature. The effects of surfactants cetylpyridium bromide (CPB) and polyvinyl alcohol (PVA) were also described. The fluorescence intensity varies linearly with the concentration of europium (Ⅲ) in the range 5.00×10 -11 ～6.00×10 -8 mol/L and 1.00×10 -7 ～9.21×10 -7 mol/L. The detection limit is down to 9.02×10 -12 mol/L. The standard addition method was used for the determination of europium in high purity yttrium oxide with satisfactory results.
基金financially supported by the National Natural Science Foundation of China(No.21601080)the Key Scientific Research Projects of Higher Education of He'nan Province(16A150016)
文摘Via the strategy of charge balance,one new pillared layered metal-organic framework [Zn2（TNB）（2-nim）]（H3TNB = 4,4？,4？？-nitrilotribenzoicacid,2-nim = 2-nitroimidazole）（1） was successfully synthesized based on mixed ligands,where binuclear [Zn2（CO2）3]~＋ cluster-based cationic layers [Zn2（TNB）]~＋ are connected by deprotonated 2-nitroimidazole.Meanwhile,CO2 adsorption bahaviors and luminescent property of compound 1 were investigated.
