几种对称钕卟啉配合物的固相合成及电化学性质

在固相条件下合成了四苯基卟啉钕、四 (对羟基苯基 )卟啉钕、四 (对甲氧基苯基 )卟啉钕、四 (对硝基苯基 )卟啉钕四种钕卟啉配合物。并用元素分析、ICP、U V、IR等手段对配合物进行了表征。用循环伏安法研究了它们的电化学性质。实验结果表明 :四种钕卟啉配合物的电化学性质相似。在循环伏安图上均出现了三对氧化还原电位。但由于卟啉环上对位取代基不同 ,峰电位值不同     

A novel blue-purple Ce~(3+) doped whitlockite phosphor:Synthesis,crystal structure,and photoluminescence properties

At present,the rare earth(RE) ions doped phosphors have attracted more and more attention because of their excellent properties.In this paper,a series of novel blue-purple β-Ca_3(PO_4)_2:Ce~(3+) phosphors were synthesized by a high temperature solid phase method.The X-ray diffraction(XRD),infrared spectrum,energy dispersive spectroscopy(EDS),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),photoluminescence excitation and emission spectra were used to investigate the crystal structure,composition and the luminescent properties of the resulting samples.The phosphor shows a strong absorption in the ultraviolet band.Under the excitation of 269 nm,the phosphor emits a strong purple fluorescence ranging from 360 to 520 nm.When Ce~(3+) doping content is 0.07 mol,the strongest luminescence intensity is reached,and the concentration quenching mechanism is dipole-dipole(d-d)interaction for Ce~(3+) based on Dexter theory.     

水溶性稀土卟啉配合物的合成及应用性质研究

用固相法合成了水溶性卟啉配合物[LnTPPS4(C3H4N2)2]·3H2O(Ln=Gd,Dy,Tm,Yb),并对它们进行了配合物-氯铂酸钾-三氯化钛三组分体系的光敏催化性能研究。     

Electrochemical Behavior of Nd~(3 ) and Ho~(3 ) in LiCl-KCl Eutectic Melt

ＥｌｅｃｔｒｏｃｈｅｍｉｃａｌＢｅｈａｖｉｏｒｏｆＮｄ３＋ａｎｄＨｏ３＋ｉｎＬｉＣｌＫＣｌＥｕｔｅｃｔｉｃＭｅｌｔＺｈａｏＭｉｎｓｈｏｕ（赵敏寿），ＬｕＸｉａｎｇｐｉｎｇ（吕翔平），ＬｉａｎｇＪｉｎ（梁金）（ＬａｂｏｒａｔｏｒｙｏｆＲａｒｅＥａｒｔ...     

A Study on the Specific Heat of the Lanthanide Oxides

In this paper,we report the measurements of the specific heat of the lanthanide oxides(La_2O_3,CeO_2,Pr_6O_(11),Nd_2O_3,Sm_2O_3,Eu_2O_3,Gd_2O_3,Tb_4O_7,Dy_2O_3,Ho_2O_3,Er_2O_3,Tm_2O_3,Yb_2O_3,Lu_2O_3)from-150℃ to800℃ by using adiabatic scanning calorimeter.We found that chemical reactions occur during the heating pro-cess of initial La_2O_3 and Nd_2O_3 materials by using DTA and X-ray diffraction.The results of specific heatmeasurement show that except CeO_2 and Tb_4O_7,other twelve lanthanide oxides were accompanied withendothermal change and weight loss to a certain degree during the heating process.     

General View on the Hi－Tech Industrial Applications of Rare Earths in Japan－Present and Future

ＧｅｎｅｒａｌＶｉｅｗｏｎｔｈｅＨｉ－ＴｅｃｈＩｎｄｕｓｔｒｉａｌＡｐｐｌｉｃａｔｉｏｎｓｏｆＲａｒｅＥａｒｔｈｓｉｎＪａｐａｎ－ＰｒｅｓｅｎｔａｎｄＦｕｔｕｒｅＯｈｍａｃｈｉＲ（大町良治）（ＳａｎｔｏｋｕＭｅｔａｌＩｎｄｕｓｔｒｙＣｏ．，Ｌｔｄ．，...     

Influence of RE Content on Damping Capacity of Alloy ZA27

Ｔｈｅｄａｍｐｉｎｇｃａｐａｃｉｔｙｏｆｍａｔｅｒｉａｌｓｉｓａｍｅａｓｕｒｅｏｆｔｈｅｅｎｅｒｇｙｔｈａｔｉｓｄｉｓｉｐａｔｅｄｉｎｔｈｅｍａｔｅｒｉａｌｓｄｕｒｉｎｇｍｅｃｈａｎｉｃａｌｖｉｂｒａｔｉｏｎｕｎｄｅｒｃｙｃｌｉｃｌｏａｄｉｎｇ．Ｔｈ...     

Effect of Yttrium on Mechanical Properties,Thermal Stability and Creep Resistance of High Temperature Titanium Alloy Ti-1100

Ｆｏｒｍａｎｙｙｅａｒｓｔｈｅｍａｘｉｍｕｍｓｅｒｖｉｃｅｔｅｍｐｅｒａｔｕｒｅｏｆｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｔｉｔａｎｉｕｍａｌｌｏｙｓｕｓｅｄｉｎａｉｒｃｒａｆｔｅｎｇｉｎｅｗａｓｌｉｍｉｔｅｄｂｅｌｏｗ５５０℃，ｗｈｉｌｅＴＩＭＥＴＡＬ１...     

Lanthanide complexes-functionalized ordered mesoporous TiO2: Multicolor emission (visible and near-infrared luminescence) based on visible-light sensitization

Recently, much attention has been paid to the lanthanide luminescent materials based on the visible-light sensitization for their potential applications in the fields of bio-imaging and optical devices. In this work, the lanthanide complexes have been covalently bonded to the ordered mesoporous titania (OMT) matrix, and the resulting titania-based hybrid ordered mesoporous materials (named as LnDB-OMT, Ln = Eu, Sm, Yb, Nd) were characterized by using Fourier-transform infrared (FT-IR) spectroscopy, small-angle X-ray powder diffraction (SAXD), N₂ adsorption–desorption isotherms, transmission electron microscopy (TEM), fluorescence spectroscopy, and thermogravimetric analysis. Generally, exciting with visible light is advantageous over UV excitation. Of importance here is that, under excitation with visible light, the LnDB-OMT all show characteristic visible (Eu³⁺, Sm³⁺) as well as near-infrared (Sm³⁺, Yb³⁺, Nd³⁺) luminescence of the corresponding Ln³⁺ ions (multicolor emission covered from 500 to 1400 nm spectral region), which is attributed to the energy transfer from the ligands to the Ln³⁺ ions via an antenna effect.     

Preparation and Characterization of Heteropolytungstoarsenate Complexes Containing Lanthanide Elements

ＰｒｅｐａｒａｔｉｏｎａｎｄＣｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆＨｅｔｅｒｏｐｏｌｙｔｕｎｇｓｔｏａｒｓｅｎａｔｅＣｏｍｐｌｅｘｅｓＣｏｎｔａｉｎｉｎｇＬａｎｔｈａｎｉｄｅＥｌｅｍｅｎｔｓ￥ＷａｎｇＷｅｉｑｉｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｃ...     

Effects of different introduction methods of Ce4+ and Zr4+ on denitration performance and anti-K poisoning performance of V2O5-WO3/TiO2 catalyst

The purpose of this work is to explore the effects of the introduction methods of Ce⁴⁺ and Zr⁴⁺ on the physicochemical properties, activity, and K tolerance of V₂O₅-WO₃/TiO₂ catalyst for the selective catalytic reduction of NO_x by NH₃. Four different methods, namely pre-impregnation, post-impregnation, co-impregnation, and co-precipitation, were used to synthesize a series of V₂O₅-WO₃-TiO₂-CeO₂-ZrO₂ catalysts. The catalysts were characterized by XRD, BET, NH₃-TPD, XPS, and H₂-TPR techniques. Moreover, the activity and anti-K poisoning performance were tested by an NH₃-SCR model reaction. The results show that the introduction of Ce⁴⁺ and Zr⁴⁺ can improve the catalytic performance of V₂O₅-WO₃/TiO₂ catalyst, but the impregnation method cannot enhance the anti-K poisoning performance. Ce⁴⁺ and Zr⁴⁺ introduced by co-precipitation method can effectively improve the tolerance of K, which is mainly due to the incorporation of Ce⁴⁺ and Zr⁴⁺ into TiO₂ lattice to form a uniform TiO₂-CeO₂-ZrO₂ solid solution, resulting in the optimal surface acidity and redox performance, and reducing the decreases caused by K-poisoning. Furthermore, based on the best introduction method, we further optimized the molar ratio of Ce⁴⁺/Zr⁴⁺. It is found that the catalyst exhibits the best anti-K poisoning performance when the molar ratio of Ce⁴⁺/Zr⁴⁺ is 2:1.     

Influence of Microstructure Homogeneity on the Electrochemical Performance of Hydrogen Storage Alloys

Ａｌｔｈｏｕｇｈｈａｖｉｎｇｈｉｇｈｃａｐａｃｉｔｙａｎｄｄｕｒａｂｉｌｉｔｙ，ＡＢ２ｔｙｐｅＬａｖｅｓｐｈａｓｅａｌｏｙｓｓｕｃｈａｓＴｉＺｒｂａｓｅｄａｌｏｙｓａｒｅｔｏｏｅｘｐｅｎｓｉｖｅｆｏｒｃｏｍｍｅｒｃｉａｌｕｓｅａｎｄｒａｒｅｅａ...     

Sorption of lanthanide ions on biochar composites

Sorption of lanthanum(Ⅲ), cerium(Ⅲ) and neodymium(Ⅲ) ions from the aqueous solutions of mixtures through adsorption on the biochar composites was investigated as a function of sorbent mass, pH, phase contact time and initial concentration of solutions at 295 K. The maximum removal of lanthanide ions takes place under the following conditions: 0.1 g of sorbent mass, pH 4 and 360 min contact time for all studied initial concentrations of solutions. Kinetics of La(Ⅲ), Ce(Ⅲ) and Nd(Ⅲ) ions sorption proceeded by a fast initial uptake reached equilibrium. This process was modelled by means of the pseudo first order, pseudo second order, intraparticle diffusion and Elovich models. The desorption of three lanthanide ions by nitric, hydrochloric and sulfuric acids at a concentration of 1 mol/L from biochar composites was also studied. In order to investigate the sorption mechanism FTIR, XRD and XPS analyses were performed after sorption of ions from the mixture.     

Synthesis and Relaxation Properties of Lanthanide(Gd ,Yb) Complexeswith Tris Modified DTPA

ＧｄＤＴＰＡ２－ｉｓａｗｅｌｌｅｓｔａｂｌｉｓｈｅｄｃｏｎｔｒａｓｔａｇｅｎｔｉｎｃｌｉｎｉｃａｌｕｓｅｆｏｒｍａｇｎｅｔｉｃｒｅｓｏｎａｎｃｅｉｍａｇｉｎｇｄｕｅｔｏｉｔｓｈｉｇｈｍｏｌａｒｒｅｌａｘｏｍｅｔｒｙ，ｈｉｇｈｃｈｅｍｉｃａｌｓｔａｂｉｌｉｔｙａｎｄｌｏｗｔｏｘｉｃｉｔｙ［１，２］．Ｈｏｗｅｖｅｒ，ｉｔｓｐａｓｓｉｖｅａｎｄｎｏｎｓｐｅｃｉｆｉｃｄｉｓｔｒｉｂｕｔｉｏｎｉｎｖｉｖｏｌｉｍｉｔｓｉｔｓｕｔｉｌｉｔｙｉｎｆｏｃａｌｌｅｓｉｏｎｄｅｔｅｃｔｉｏｎａｎｄｍｏｒｅｏｖｅｒ…     

The Effect of Lanthanide and Transition Metal Ions on the Fluorescence Spectra for the Anticoagulation Factor of Snake Venom

The effect of lanthanide and transition metal ions on the fluorescence spectra of theanticoagulation factor(ACF)of snake venom has been studied.It is postulated that the quenching oftryptophan residue fluorescence by lanthanide and transition metal ions is caused by the metal ion-inducedconformation change of ACF.     

Synthesis and Spectral Properties of Mixed-Ligand Complexes of Lanthanide Perchlorate with Bis-(phenylsulfinyl)ethane and Organic Lewis Bases

ＳｙｎｔｈｅｓｉｓａｎｄＳｐｅｃｔｒａｌＰｒｏｐｅｒｔｉｅｓｏｆＭｉｘｅｄＬｉｇａｎｄＣｏｍｐｌｅｘｅｓｏｆＬａｎｔｈａｎｉｄｅＰｅｒｃｈｌｏｒａｔｅｗｉｔｈＢｉｓ（ｐｈｅｎｙｌｓｕｌｆｉｎｙｌ）ｅｔｈａｎｅａｎｄＯｒｇａｎｉｃＬｅｗｉｓＢａｓｅ...     

Rare-earth,nitrogen-rich,oxygen heterocyclic supramolecular compounds (Nd,Sm, and Eu): Synthesis,structure, and catalysis for ammonium perchlorate

Three novel rare-earth, nitrogen-rich and oxygen heterocyclic supramolecular complexes, namely [Nd (BTF)₂(H₂O)₅]_n, [Sm(BTF)₂(H₂O)₅]_n, and [Eu(BTF)₂(H₂O)₅]_n, were synthesized. A single crystal was obtained by the solvent evaporation method, and the structure and coordination mode of metal complexes were determined by single crystal X-ray diffraction. Results show that the supramolecular complexes contain many hydrogen bonds and thus have good thermal stability (T_dec > 540 K). The thermal decomposition of ammonium perchlorate (AP) catalyzed by the complexes was investigated by differential thermal analysis, which reveals a pre-eminent catalytic effect on AP. The high temperature decomposition peak of AP can be advanced by nearly 90 K at the amount of added complexes of 10 wt%, and the activation energy of AP descent range is from 70 to 150 kJ/mol. The other properties were fully characterized through elemental analysis and Fourier transform infrared spectroscopy.     

NiTi合金在甲酰胺-氨磺酸溶液中的电化学反应机制

运用循环伏安和极化曲线法研究了镍钛合金在甲酰胺-氨磺酸体系中的电化学反应机制。对阳极极化曲线和Tafel曲线的研究表明,镍钛阳极的动力学参数为:a=5.6399,b=0.7229,i0=1.5784×10-8A.cm-2,nβ=0.08。循环伏安法和XPS研究表明,在本实验条件下,镍钛合金在甲酰胺-氨磺酸体系中是以整体的形式,而不是以钛元素和镍元素分别进行阳极溶解的,该阳极反应为不可逆过程,为一步7电子的氧化过程,该阳极反应为:NiTi-7e→Ti4++Ni3+,Ni3+在酸性溶液中极不稳定,发生还原过程:Ni3++e→Ni2+。     

Synthesis and Spectroscopic Characterization of Compounds of Lanthanide-2,4-Pentanedionates with Pyridine

Compounds of the formula [Ln(pd)_3(py)_2] where Ln=La～Yb and Y except Pm and Tin,Hpd (=2,4-pentanedione) and py (=pyridine) have been synthesised and characterised by physical and spectral studies.Pyridine is coordinated in all the compounds.The covalency parameters β,b~(1/2),δ and η indicate at least somecovalency in these compounds.The compounds have been checked for their use as NMR shift reagents usingcholesterol as substrate.Eight coordinate compounds increase their coordination number when added to thesubstrate.     

The ~(13)C-NMR Study of the Conformation of L-Arginine in Aqueous Solution by Lanthanide Probes

The heavy lanthanide ions(Dy,Ho,Er,Tm and Yb)were used to probe the conformation of L-arginine inaqueous solution.The results showed that the contact contribution to the observed~(13)C paramagnetic shift is verysmall for nuclei four or more bonds away from the bound lanthanide ion and it is significant for those in closeproximity to the lanthanide ion.The overall conformation of L-arginine was established by fitting the calculatedgeometric factors for the corresponding experimental data.In the lanthanide-L-arginine complex,the wholebackbone of the ligand is located outsite the zero-dipolar shift cone of the lanthanide ion with the carboxyl groupselectively coordinated to the metal.The calculated RE-O distance is 0.21 nm for the bidentate coordinationmode and the ligand is in an extended conformation in the solution with the molecular backbone corresponding tothe trans form.