一种定量分析金属镀层中特定元素含量的简单方法

用光学的方法（如常见的X射线荧光分析法、发射光谱分析法^[1]等）分析固体样品中特定元素及其含量是常见的分析方法。相对于化学方法，它们的分析过程简单、迅速。笔者在分析样品中遇到了一些比较特殊的分析要求，例如在金属外镀了另外的合金，要求分析在镀层中特定元素的浓度。一种直接的方法是用X射线荧光做定量分析，可以给出镀层的元素含量。但X荧光定量分析需要特定的标样，对使用者存在一定的不便之处，而且设备也较贵。本研究采用普通的原子光谱分析法结合简单的数学推导，解决了上述问题。本方法也可以应用于普通的光学原子发射光谱分析。     

[Cu(2,2''-bpy)Cl2]和[Cu(1,10-phen)C12]在多金属氧酸盐上的多相化:选择性氧化四氢化萘的新催化剂

Mononuclear Cu(II)bipyridine(1)and phenantroline complexes(2)were synthesized and immobilized by different procedures on H3PW12O40 polyoxometalate(POM).Characterization by XRD and SEM-EDX were performed to assess the preservation of the Keggin structure and stoichiometry of the complex.The immobilized complexes were tested as heterogeneous catalysts for the partial oxidation of tetralin(1,2,3,4-tetrahydronaphthalene)using hydrogen peroxide as oxidant in acetonitrile/water as solvent.[Cu(2,2'-bpy)Cl][H2PW12O...     

Hydrothermal Synthesis of Two 3D Lanthanide(Ⅲ) Organometallic Polymers in the 3,5-Pyridinedicarboxylate System with Different Coordination Architecture

Two coordination polymers of lanthanide complexes [(Dy)2(3,5-PDA)3(H2O)2]n 1 and [(Pr)2(3,5-PDA)3(H2O)3]n 2 (3,5-PDA = pyridine-3,5-dicarboxylate) have been synthesized under hydrothermal conditions. The prepared compounds were characterized by elemental analysis, IR and TG analyses and single-crystal X-ray structure determination. Complex 1 crystallizes in monoclinic, space group C2/c with a = 14.104(2), b = 11.1129(16), c = 15.086(2) , β =92.138(2)o, V = 2362.8(6) 3, Z = 4, C21H13Dy2N3O14, Mr = 856.34, Dc = 2.407 g·cm-3, F(000) = 1616, μ(MoKα) = 6.359 mm-1, the final R = 0.0422 and wR = 0.1016 for 2000 observed reflections with I 2σ(I). Complex 2 crystallizes in triclinic, space group P1 with a = 8.9441(13), b = 9.3959(14), c = 14.625(2), α = 98.065(2), β = 95.481(2), γ = 104.9130(10)o, V = 1164.7(3) 3, Z = 2, C21H15Pr2N3O15, Mr = 831.18, Dc = 2.370 g·cm-3, F(000) = 800, μ(MoKα) = 4.224 mm-1, the final R = 0.0355 and wR = 0.0731 for 4092 observed reflections with I 2σ(I). These polymers are constructed from the 3,5-PDA ligand but they exhibit different kinds of metal-organic framework structures. Complexes 1 and 2 are constructed from M-C-O zigzag corner-linked chains (M = Dy and Pr). In 1, the chains are composed of 8-coordinated DyIII centers, while the chains are made up of 8- and 9-coordinated PrIII centers in complex 2. These chains are cross-linked to each other by the pyridine rings of 3,5-PDA ligands, generating three-dimensional architectures. The magnetic behavior of compound 1 has been investigated, showing it exhibits antiferromagnetic interactions among the DyIII ions.a (Tianjin Key Laboratory of Structure and Performance for Functional Molecule, College of Chemistry and Life Science, Tianjin Normal University, Tianjin 300387, China) b (State Key Laboratory of Element-organic Chemistry, Nankai University, Tianjin 300071, China)     

Expression and Emmprin Regulated Function of Aquaporinl in SMMC7221 Cells

<正>Herein lie the crosstalk and regulation between AQP1 and Emmprin in SMMC7221 cells by means of siRNA technology and deglycosylation method.Firstly,HAQP1,rather than hAQP3,was selectively upregulated in SMMC7221 cells by FBS,flollowed by the upregulated expression of Emmprin.Emmprin gene silencing caused a remarkable change in the expression of AQP1 gene,just like its downstream gene,MMP9,meanwhile the water permeability and cell migration were also descended prominently.Furthermore,when treated with tunicamycin, Emmprin was deglycosylated,which made the expression of AQP1 significantly declined,followed by remarkably decreased cell membrane water permeability and cell migration.Taken together,all the data indicates the expression level and the modification of Emmprin by glycosylation are the key factors in regulating the expression of AQP1.     

[Ti（CO）6（MPEt3）]^—（M=Au,Ag,Cu）配合物稳定性及共电子性质的量子化学研究

采用ab initioHF和密度泛函B3LYP方法对[Ti(CO)6(MPEt3)]^配合物稳定性进行了系统理论计算，并对Ti-Au金属－金属相互作用能运用完全均衡校正法对基函数重叠误差（BSSE）进行较正。理论优化的结构与X射线衍射晶体结构实验基本相符，Ti-Au相互作用能为10．8575eV(B3LYP/BSSE)。进一步探讨Cu族元素为中心的同系配合物离子[Ti(CO)6(MPEt3)]^-(M=Cu,Ag,R=Me,H)的电子性质及结合能规律，结果表明：Cu族化合物中，Au形成了较为稳定的化合物，表现出金属－金属相互作用影响比较明显。     

金属插层对C60／A1N一维光子晶体带隙的影响

利用传输矩阵方法，研究了金属Ag插层对C60／A1N一维光子晶体带隙宽度以及反射率的影响．结果表明：在C60，与A1N之间插入Ag组成的[C60／Ag／A1N]n一维光子晶体，与未插入Ag层相比可使带隙增宽73．91％．最大反射率提高到91．01％．该结构可望用于制作紫外线波段的宽带反射镜．     

Symmetry role on the preedge X—ray absorption fine structure at the metal K edge

The preedge features in a system with “even”symmetry,apart from quadrupolar transition contribution,are mainly dipolar in character,associated with the existence of unoccupied states made up of mixed cation-4p with higher-neighboring cation-3d orbitals,and reflect the density of states due to the medium-range order of the system.In “odd“symmetry materials these preedge features ate the result of a transition from the ls to a final density of states of p symmetry due to an unsymmetrical mixing of the ligand wave functions with the central cation 3d orbitals,similar to atetrahedral configuration.These results are validated for Fe as a photoabsorber by comparing XAS spectra of Fe2SiO4(fayalite) to ab initio full multiple scattering calculations at the fe K edge,but pertain to all systems containing sixfold-coordinated cations.     

测定金属热膨胀系数的新方法

热膨胀是固体材料的一个重要特性.线膨胀系数是工程设计、精密仪器制造、材料焊接和加工中必须考虑的重要参数之一.学习线膨胀系数的测量是十分有意义的.