Cs[Er6C]I12 und Cs2Lu[Lu6C]Cl18: Beispiele für quaternäre reduzierte Halogenide der Lanthanide mit isolierten „Clustern”︁

CS[Er₆C]I₁₂ and cs₂Lu[Lu₆C]CI₁₈: Examples for Quaternary Reduced Halides of the Lanthanides with Isolated “Clusters” Cs[Er₆C]I₁₂ and Cs₂Lu[Lu₆C]Cl₁₈ were obtained as byproducts through metallothermic reductions of ErI₃ and LuCl, with cesium in the presence of carbon in sealed tantalum containers at temperatures ranging from 700 to 940 °C. Cs₂Lu[Lu₆C]Cl₁₈ (isostructural with Cs₂Zr[Zr₆H]Cl₁₈, R 3 , a = 981.7 pm, c = 2723.2 pm, Z = 3, R = 0.082, R, = 0.053) contains octahedral [Lu₆C] clusters which are slightly compressed along the threefold axis and edge-bridged by twelve chloride anions to form [Lu₆C]Cl₁₂ units. Six additional Cl in exo positions of the cluster provide octahedral coordination for the seventh Lu³⁺. Cs⁺ occupies anticuboctahedral interstices within the Cl⁺ layers as a part of the (hexagonal) closest packed arrangement. Cs[Er₆C]I₁₂ (trigonal, R 3, a = 1112.0pm, c = 2063.8pm, Z = 3, R = 0.094, R, = 0.068) exhibits [Er₆C]I₁₂ units as well and shows the structural framework of Sc[Sc₆N]Cl₁₂. Instead of Sc³⁺ in octahedral holes, cesium occupies a regular iodide position within the ccp sheets forming [CsI₃] layers. Both halides are compared with other compounds of the lanthanides containing isolated [M₆X₁₂] clusters. The extreme electron deficiency is discussed.     

Lu3+-8-羟基喹啉-5-磺酸-CTMAB体系L*-L型荧光反应的研究及其分析应用

研究表明8-羟基喹啉-5-磺酸与Lu3 和CTMAB形成稳定的三元离子缔合物,发射Lu3 微扰的配体的荧光.表面活性剂CTMAB的加入提高了量子效率,使荧光强度增加10倍.对于此三元体系,体系的荧光强度与Lu3 的浓度在1.0×10-6~1.0×10-5mol/L范围内呈线性关系,当信噪比=2时,检测限为4.0×10-7mol/L,采用多点增量标准加入法测定了重稀土混合样品中的Lu3 ,结果满意.     

Electrospun Polyacrylic Acid Polymer Fibers Functionalized with Metallophthalocyanines for Photosensitizing and Gas Sensing Applications

The photophysical and photochemical properties of tetraaminophthalocyanine complexes of lutetium and zinc covalently linked to polyacrylic acid were studied alongside those of unsubstituted zinc phthalocyanine within the same polymeric fiber matrix. All three phthalocyanines within the solid fiber matrices showed photoactivity by the generation of singlet oxygen as was observed in solution. The fluorescence behaviors of the composite fibers equally parallel those in solution. For the unsubstituted zinc phthalocyanine composite, the fiber showed fluorescence quenching on interaction with gaseous nitrogen dioxide similar to that in DMF and, thus could be a promising nanofabric material in developing optoelectronic devices that are responsive to the gas.     

6－羟基水杨酸－EDTA－溴化十六烷基三甲铵体系荧光法测定铽、镝、钐、钇、镥

探讨了６－羟基水杨酸－ＥＤＴＡ－溴化十六烷基三甲铵体系对Ｔｂ３＋、Ｄｙ３＋、Ｓｍ３＋等金属离子激发态→金属离子基态跃迁型荧光增敏及Ｙ３＋、Ｌｕ３＋对该体系配体激发态一配体基态跃迁型荧光增敏效应。开发了同时测定Ｔｂ３＋、Ｄｙ３＋Ｓｍ３＋、Ｙ３＋（Ｌｕ３＋）的新荧光体系。利用该方法成功地测定了某些稀土氧化物中的铽、、镝、钐、钇、镥含量。     

镥的激光共振电离同位素选择性研究

本文在速率方程基础上通过数值模拟方法 ,对镥的激光共振电离通道 :5d6s2 2 D3 /2 (5 73.6 5 5nm)→5d6s6 p4F3 /2 (6 4 2 .5 18nm)→ 6s6 p2 4P1/2 (6 4 3.5 4 8nm)→Autoionizationstate的激光诱导同位素选择性进行了研究。在实际实验条件下用这一方法计算得到的激光波长对激光诱导同位素选择性的关系与实验结果相符合。探讨了在偏振激光作用的情况下各种激光参数 (波长、带宽和激光强度 )对激光诱导同位素选择性的影响 ,并提出了在一定实验条件下激光共振电离质谱计较为准确地测定同位素比值的方法。这一理论方法 ,同样适用于研究其它元素的激光共振电离同位素选择性和选择激光同位素分离电离通道     

Synthesis and Characterization of GaIII,YIII, and LuIII Complexes with Etifenin and Analogues

Complexes of etifenin ( 1a ), disofenin ( 1b ), and mebrofenin ( 1c ) with Ga^III, Y^III, and Lu^III were synthesized and characterized by NMR spectroscopy and UV/Vis spectroscopy. Stability and protonation constants of the complexes of 1a were determined by potentiometry and distribution diagrams were calculated. It was shown that the Y^III and Lu^III species are most stable as bis chelates at higher pH, whereas the Ga^III complex degrades at pH < 4.5.     

慢电子速度成像法结合低温冷离子阱测量镥的电子亲和势

本文采用低温冷离子阱囚禁的手段累积镥的负离子束流,使得对其电子亲和势的测量变得实际可行.运用慢电子速度成像法获得具有高分辨率的镥负离子的光电子能谱,测得镥的电子亲和势为1926.2(50) cm~(-1)或0.23882(62) eV.此外,还观察到镥负离子的两个激发态.     

Bulky Cations and Four different Polyiodide Anions in [Lu(Db18c6)(H2O)3(thf)6]4(I3)2(I5)6(I8)(I12)

Black single crystals of [Lu(Db18c6)(H₂O)₃(thf)₆]₄(I₃)₂(I₅)₆(I₈)(I₁₂) were obtained from lutetium, I₂ and Db18c6 (dibenzo‐18‐crown‐6) in THF solution. In the bulky cation, Lu³⁺ is surrounded by nine oxygen atoms, six of Db18c6 and three of water molecules to which two THF molecules are attached each. Meanwhile, four polyiodide anions, (I₃)^–, (I₅)^–, (I₈)^2– and (I₁₂)^2–, in a 2:6:1:1 ratio form a three‐dimensional network and leave space for the bulky cations.     

Structural and Optical Characterization of Ytterbium Doped Lutetium Double Phosphates

Powder samples of the ternary phosphates A₃Lu(PO₄)₂:Yb³⁺ (A = Na, Rb) have been synthesised by solid state reactions. The spectroscopic properties of Yb³⁺ in double phosphate host lattices were investigated using absorption, emission and excitation spectra at 4, 10 and 293 K in the VUV to IR range. The results obtained for both types of phosphates are compared. Together with the fundamental ²F_5/2 → ²F_7/2 emission in the IR range, a broad band emission with two peaks in the UV region were observed in Yb³⁺‐activated Na₃Lu(PO₄)₂. The second emission is due to a charge–transfer transition type. The influence of the alkali metal cation site of the host lattice on the luminescence properties was investigated. The tentative energy level scheme of the ground and excited ²F_J (J=7/2, 5/2) levels is described.     

水杨酸丁酯—Lu^3＋胶束体系荧光法测定铽

系统地探讨了水杨酸乙、丁、戊酯－ＴｒｏｔｏｎＸ－１００体系荧光法测定Ｔｂ＾３＋、Ｄｙ＾３＋的最佳条件，发现Ｌｕ＾３＋或Ｇｄ＾３＋的共享存能使Ｔｂ＾３＋、Ｄｙ＾３＋的特征荧光增敏。其中水杨酸丁酯－Ｌｕ＾３＋增敏体系的灵敏度最高，测定Ｔｂ＾３＋、Ｄｙ＾３＋的检测限分别达到０．２和０．８ｇμ／Ｌ。应用本法成功的测定了Ｌｕ２Ｏ３、Ｇｄ２Ｏ３中０．００ｘ％的Ｔｂ４Ｏ７的含量。