ZnO(4mol%),In 2O 3(1mol%)and Fe 2O 3(0.05mol%)were doped in LiNbO 3 and Czochralski method was used to grow Zn∶In∶Fe∶LiNbO 3 crystal.The diameter of the crystal we grew is 30mm.The technology parameter we took is t...ZnO(4mol%),In 2O 3(1mol%)and Fe 2O 3(0.05mol%)were doped in LiNbO 3 and Czochralski method was used to grow Zn∶In∶Fe∶LiNbO 3 crystal.The diameter of the crystal we grew is 30mm.The technology parameter we took is that the axial temperature gradient is 40℃/cm,the growth rate is 1mm/h, the rotation rate is 15-25r/min,the temperature of polarization is 1220℃ and the current density of polarization is 5mA/cm 2.The wafer dimension is 10mm×10mm×3mm and was covered in Li 2CO 3 powder to reduce.The reduction temperature is 500℃ and reduction time is 30 hours. OH - stretch vibration transmission spectra were measured by Fourier infrared spectrophotometer. There are two absorption peaks in OH - spectra of Zn∶In∶Fe∶LiNbO 3,in which one is at 3534cm -1 (2.83μm) and the other is at 3505cm -1 (2.85μm).The peak at 2.85μm is far lower than that at 2.83μm. Because of the threshold effect of Zn 2+ and In 3+ ,the peak at 2.83μm is generated and the peak at 2.85μm is related with Fe 3+ .In LiNbO 3 only doped with Fe,Li + site is taken place by Fe 3+ .When doping Zn 2+ and In 3+ in high concentration,these two ions take place Nb that is at Li site and Fe 3+ substitutes for Nb 5+ at the same time.The interaction between Fe 3+ and OH - make the OH - peak shift to 2.85μm.展开更多
镧系金属有机骨框架(Lanthanide metal organic frameworks,Ln-MOFs)是以镧系离子为中心,与配体有机物组合的多孔材料,具有良好的光学性质,在许多领域有广泛的应用。不同的镧系离子与相应的有机配体结合,可组成不同性能的Ln-MOFs。在众...镧系金属有机骨框架(Lanthanide metal organic frameworks,Ln-MOFs)是以镧系离子为中心,与配体有机物组合的多孔材料,具有良好的光学性质,在许多领域有广泛的应用。不同的镧系离子与相应的有机配体结合,可组成不同性能的Ln-MOFs。在众多镧系元素中,Tb^(3+)和Eu^(3+)是良好的发光中心,常被用于组建发光Ln-MOFs。由Tb^(3+)/Eu^(3+)与有机配体形成的Ln-MOFs具有独特的荧光特性、较大Stokes位移以及长发光寿命等优点,在荧光检测领域具有重要应用。综述了基于Tb^(3+)/Eu^(3+)的Ln-MOFs在离子检测、生物标志物检测以及小分子检测领域的研究进展,并对Ln-MOFs的发展前景进行了展望。展开更多
he interaction of lanthanide (Ln￣(3+))ions with trchosanthin(TCS)was investi-gated using Tb￣(3+) as fluorescent probe. The metal-binding sites of the protein were probed by means of adding the Tb￣(3+) into the prot...he interaction of lanthanide (Ln￣(3+))ions with trchosanthin(TCS)was investi-gated using Tb￣(3+) as fluorescent probe. The metal-binding sites of the protein were probed by means of adding the Tb￣(3+) into the protein solutions. If other Ln￣(3+) ions exist in the Tb￣(3+) protein complex system, they would compete against Tb￣(3+) in the binding sites of the protein, and so the fluorescence intensity of Tb￣(3+) decreased,which is called quenching effect.The quencliing effect is related to the ionic radii of the Ln￣(3+) ions and energy transfer from Tb￣(3+) protein to Ln￣(3+) ions. Based on the ex- perimental results,a schematic of the energy transfer from protein-Tb￣(3+) complex to protein-Ln￣(3+) complex is suggested.展开更多
Four solid complexes of Ln(Me2dtc)3(phen) (Ln=La, Pr, Nd, Sm) were synthesized in anhydrous ethanol by the reaction of lanthanide chloride low hydrate with the mixed ligand of sodium dimethyldithiocarbamate and 1, 10-...Four solid complexes of Ln(Me2dtc)3(phen) (Ln=La, Pr, Nd, Sm) were synthesized in anhydrous ethanol by the reaction of lanthanide chloride low hydrate with the mixed ligand of sodium dimethyldithiocarbamate and 1, 10-phenanthroline·H2O (phen·H2O), and characterized by elemental analysis, IR spectroscopy, TG-DTG, and X-ray diffraction analysis. TG-DTG with X-ray powder diffraction showed that these compounds could decompose to lanthanide sulfides at relatively lower temperature, which indicated that the title complexes could be favorable precursors to prepare lanthanide sulfides.展开更多
采用水热合成和恒温加热合成方法,得到了两种Ln3+的配合物[Nd(oxinate)(phen)2(NO3)2]·(CH3OH)1/2(1)和Sm(phen)2(CH3COO)3(2).对这两种化合物的单晶进行了X-射线衍射分析,确定了它们的结构.并对这两种化合物的UV VIS NIR,IR和荧...采用水热合成和恒温加热合成方法,得到了两种Ln3+的配合物[Nd(oxinate)(phen)2(NO3)2]·(CH3OH)1/2(1)和Sm(phen)2(CH3COO)3(2).对这两种化合物的单晶进行了X-射线衍射分析,确定了它们的结构.并对这两种化合物的UV VIS NIR,IR和荧光光谱进行了测定和分析.展开更多
文摘ZnO(4mol%),In 2O 3(1mol%)and Fe 2O 3(0.05mol%)were doped in LiNbO 3 and Czochralski method was used to grow Zn∶In∶Fe∶LiNbO 3 crystal.The diameter of the crystal we grew is 30mm.The technology parameter we took is that the axial temperature gradient is 40℃/cm,the growth rate is 1mm/h, the rotation rate is 15-25r/min,the temperature of polarization is 1220℃ and the current density of polarization is 5mA/cm 2.The wafer dimension is 10mm×10mm×3mm and was covered in Li 2CO 3 powder to reduce.The reduction temperature is 500℃ and reduction time is 30 hours. OH - stretch vibration transmission spectra were measured by Fourier infrared spectrophotometer. There are two absorption peaks in OH - spectra of Zn∶In∶Fe∶LiNbO 3,in which one is at 3534cm -1 (2.83μm) and the other is at 3505cm -1 (2.85μm).The peak at 2.85μm is far lower than that at 2.83μm. Because of the threshold effect of Zn 2+ and In 3+ ,the peak at 2.83μm is generated and the peak at 2.85μm is related with Fe 3+ .In LiNbO 3 only doped with Fe,Li + site is taken place by Fe 3+ .When doping Zn 2+ and In 3+ in high concentration,these two ions take place Nb that is at Li site and Fe 3+ substitutes for Nb 5+ at the same time.The interaction between Fe 3+ and OH - make the OH - peak shift to 2.85μm.
文摘镧系金属有机骨框架(Lanthanide metal organic frameworks,Ln-MOFs)是以镧系离子为中心,与配体有机物组合的多孔材料,具有良好的光学性质,在许多领域有广泛的应用。不同的镧系离子与相应的有机配体结合,可组成不同性能的Ln-MOFs。在众多镧系元素中,Tb^(3+)和Eu^(3+)是良好的发光中心,常被用于组建发光Ln-MOFs。由Tb^(3+)/Eu^(3+)与有机配体形成的Ln-MOFs具有独特的荧光特性、较大Stokes位移以及长发光寿命等优点,在荧光检测领域具有重要应用。综述了基于Tb^(3+)/Eu^(3+)的Ln-MOFs在离子检测、生物标志物检测以及小分子检测领域的研究进展,并对Ln-MOFs的发展前景进行了展望。
文摘he interaction of lanthanide (Ln￣(3+))ions with trchosanthin(TCS)was investi-gated using Tb￣(3+) as fluorescent probe. The metal-binding sites of the protein were probed by means of adding the Tb￣(3+) into the protein solutions. If other Ln￣(3+) ions exist in the Tb￣(3+) protein complex system, they would compete against Tb￣(3+) in the binding sites of the protein, and so the fluorescence intensity of Tb￣(3+) decreased,which is called quenching effect.The quencliing effect is related to the ionic radii of the Ln￣(3+) ions and energy transfer from Tb￣(3+) protein to Ln￣(3+) ions. Based on the ex- perimental results,a schematic of the energy transfer from protein-Tb￣(3+) complex to protein-Ln￣(3+) complex is suggested.
基金Project supported by the National Natural Science Fundation of China (20471047 20771089)the National NaturalScience Fundation of Shaanxi Province (2007B02)
文摘Four solid complexes of Ln(Me2dtc)3(phen) (Ln=La, Pr, Nd, Sm) were synthesized in anhydrous ethanol by the reaction of lanthanide chloride low hydrate with the mixed ligand of sodium dimethyldithiocarbamate and 1, 10-phenanthroline·H2O (phen·H2O), and characterized by elemental analysis, IR spectroscopy, TG-DTG, and X-ray diffraction analysis. TG-DTG with X-ray powder diffraction showed that these compounds could decompose to lanthanide sulfides at relatively lower temperature, which indicated that the title complexes could be favorable precursors to prepare lanthanide sulfides.
文摘采用水热合成和恒温加热合成方法,得到了两种Ln3+的配合物[Nd(oxinate)(phen)2(NO3)2]·(CH3OH)1/2(1)和Sm(phen)2(CH3COO)3(2).对这两种化合物的单晶进行了X-射线衍射分析,确定了它们的结构.并对这两种化合物的UV VIS NIR,IR和荧光光谱进行了测定和分析.
