Zn^2＋在电解还原铕（Ⅲ）过程中的催化行为研究

本文报道微量Zn~(2+)在电解还原铕(Ⅲ)离子过程中的催化作用,研究结果表明:当阴极中含Zn~(2+)时,铕(Ⅲ)离子将缩短到达定量还原的时间,用循环伏安法监控电极过程的结果表明:电极过程是准一级的催化过程。     

双核铕－邻甲基苯甲酸－邻菲罗啉三元配合物的晶体结构

双核铕－邻甲基苯甲酸－邻菲罗啉三元配合物的晶体结构王瑞芬，王明昭，金林培，蔡冠梁（北京师范大学化学系，１００８７５，北京；解放军防化指挥工程学院，１０２２０５，北京；第一作者，４４岁，女，副教授）关键词铕；三元配合物；晶体结构分类号Ｏ７４１．６；Ｏ６...     

Nuclear forward scattering vs. conventional Mössbauer studies of atomically tailored Eu-based materials

With the decrease in size of devices, rapid characterization of nano-devices is an inevitable necessity. It is shown that Mössbauer spectroscopy using synchrotron radiation from the advanced photon source provides such a tool of investigation. Results are presented and compared for conventional Mössbauer and Nuclear Forward Scattering for ¹⁵¹Eu-doped magnesium sulfide as an example, especially at low concentrations.     

新型稀土芳香羧酸类配合物的合成及其光致和电致发光性质

合成了新型可溶性稀土芳香羧酸类配合物，测定了有机配体的三重态能级，并考察了其光致发光相对强度、荧光寿命，发现该系列稀土配合物具有很高的光致发光效率。利用其优良的溶解性，采用高聚物掺杂、旋涂技术将其制成薄膜应用于电致发光研究中，成功地制备出具有高色纯度的稀土有机电致发光器件。对于ITO／PVK／PVK：Tb(AS)3Phen：PBD／PBD／Al电致发光器件，其最大亮度为32cd．m^-2。     

吡啶—2,6—二羧酸体系导数荧光法同时测定铀,钐,铕,铽,镝

本研究了吡啶－２，６－二羧酸（ＤＰＡ）体系导数荧光法同时测定铀，钐，铕，铽，镝的最佳条件。在ｐＨ５．５，４．８×１０＾－＾５ｍｏｌ／ＬＤＰＡ，激发波长２７２ｎｍ的条件下，可分别在５１８，６３９，６２１，５３９和６６ｎｍ处测定铀，钐，铕，铽和镝，检测限分别达到７，０．４，０．００４，０．０２６和０．２５ｎｇ／ｍＬ。应用本法测定了混合成试液中上术五种离子含量，回收率为９２．３－１０８．１％。     

Magnetic phase transitions in nanostructures induced by shear stress under high pressure

Magnetic phase transitions of the first and second order were revealed by Mössbauer spectroscopy in nanosystems of - and -ferric oxides and metallic europium subjected to shear stress (240°) under high pressure (20 kbar). For - and -ferric oxide nanoclusters, the Curie (Neel) points decreased to 300 K, whereas for nanostructured europium the Neel point increased from 90 to 100 K. The thermodynamic model of magnetic phase transitions predicting a change in the character of magnetic phase transitions and a decrease (increase) in the critical Neel (Curie) points in nanoclusters was developed. The type of magnetic phase transitions and the change in the critical points were caused by defects in nanoclusters, whose maximum concentration was observed for the clusters with the 20—50 nm size range.     

Crystal Structure of Complex Tris(4,4,4-trifluoro-1-phenyl-1,3-butanedione)(1,10-phenanthroline) Europium(III)

IntroductionCertainlanthanideionspossessharpemissionlinesinthevisibleregions.Thepossibilityoftransferringenergyeffi cientlytotheseionsbywayofstronglyabsorbingtransitionscharacteristicoforganicligandshasspurredmanyworkerstoinvestigatelanthanidechelatesaspotentiallasermaterials .Amongthemtheternarycomplexesofeuropium(III)andter bium(III)withtris(β diketonates)andanneutralligandhaveespeciallyattractedmuchattentionfortheirstronglumi nescence.Itmakethemaextensiveapplicationsindevelop mentofnewl…     

Solvation of uranyl(II), europium(III) and europium(II) cations in "basic" room-temperature ionic liquids: a theoretical study

We report a molecular dynamics study of the solvation of UO2(2+), Eu3+ and Eu2+ ions in two "basic" (Lewis acidity) room-temperature ionic liquids (IL) composed of the 1-ethyl-3-methylimidazolium cation (EMI+) and a mixture of AlCl4- and Cl- anions, in which the Cl-/AlCl4- ratio is about 1 and 3, respectively. The study reveals the importance of the [UO2Cl4]2- species, which spontaneously form during most simulations, and that the first solvation shell of europium is filled with Cl- and AlCl4- ions embedded in a cationic EMI+ shell. The stability of the [UO2Cl4]2- and [Eu(III)Cl6]3- complexes is supported by quantum mechanical calculations, according to which the uranyl and europium cations intrinsically prefer Cl- to the AlCl4- ion. In the gas phase, however, [Eu(III)Cl6]3- and [Eu(II)Cl6]4- complexes are predicted to be metastable and to lose two to three Cl- ions. This contrasts with the results of simulations of complexes in ILs, in which the "solvation" of the europium complexes increases with the number of coordinated chlorides, leading to an equilibrium between different chloro species. The behavior of the hydrated [Eu(OH2)8]3+ complex is considered in the basic liquids; the complex exchanges H2O molecules with Cl- ions to form mixed [EuCl3(OH2)4] and [EuCl4(OH2)3]- complexes. The results of the simulations allow us to better understand the microscopic nature and solvation of lanthanide and actinide complexes in "basic" ionic liquids.     

Electrode kinetics of Eu3+/Eu2+ reaction by cyclic voltammetry

The cyclic voltammetric behaviour of Eu³⁺/Eu²⁺ couple at hanging mercury drop electrode (HMDE) has been studied in chloride, bromide, iodide, thiocyanate and EDTA supporting electrolytes. The apparent rate constant and transfer coefficient for these systems have been calculated at various voltage scan rates, without using the data for standard or formal potential. The values have been compared with those obtained by earlier workers through other electrochemical methods.