Synthesis and Structural Determination of Nine-Coordinate K[Gd~Ⅲ(edta)(H_2O)_3]·5H_2O

1 IntroductionMagnetic Resonance Imaging (MRI) ap-peared in l980's. It has gradually become animPortant member in the diagnosis imagingtechnology fieId. Generally, in order to furtherraise the diagnosis quality of MRI, this tech-no1ogy needs to be imPoved and perfectedthrough two respects, i.e., the imProvement ofinstrument design and the aPplication of contra-st agents containing paramagnetic coInPounds.In fact, these paramagnetic comPounds appar-ently shorten relaxation time, increase…     

Investigation on Molecular and Crystal Structures of Metal Complexes with Aminopolycarboxylic Acids——Synthesis and Structure of K[In~Ⅲ(EDTA)(H_2O)]·2H_2O

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Synthesis and Structural Determination of Nine-coordinate K_2[Y~Ⅲ(dtpa)(H_2O)]·7H_2O

1 ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｃｏｍｐｏｕｎｄｓｏｆｔｈｅｒａｄｉｏａｃｔｉｖｅｅｌｅ ｍｅｎｔ90 Ｙｈａｖｅｏｆｔｅｎｂｅｅｎｕｓｅｄｆｏｒｔｈｅｔｒｅａｔ ｍｅｎｔｏｆｅｖｅｒｙｋｉｎｄｏｆｃａｎｃｅｒ[1]ｂｅｃａｕｓｅｔｈｅｙｃａｎｅｍｉｔｐｕｒｅａｎｄｈｉｇｈ ｅｎｅｒｇｙ β ｒａｙａｎｄｐｏｓｓｅｓｓｔｈｅａｐｐｒｏｐｒｉａｔｅｈａｌｆ ｌｉｆｅ (ｔ1/ 2 =64 0ｈ)ａｎｄｍｏｄｅｒａｔｅｅｎｅｒｇｙ(Ｅｍａｘ=2 .2 7ＭｅＶ) .Ｈｏｗｅｖｅｒ,ｔｈｅｒａｄｉｏａｃｔｉｖｅｒａｙｓｏｆｔｈｅ90 Ｙｉ…     

Electrical conductivity and thermopower studies on Fex[Pt(C2O2)2]·6H2O (where x ⋍ 0.8)

The electrical conductivity (d.c. and 35 GHz) and thermopower of Fe_x[Pt(C₂O₄)₂]·6H₂O, FeOP, are presented and compared with those of other partially oxidized bis(oxalato)platinate salts of divalent cations. At room temperature FeOP is metallic with a conuctivity of 6 S cm⁻¹ and a thermopower of 15 μV/K. Below room temperature there is a structural transition, which has little influence on transport properties. Below 160 K FeOP is a semiconductor with an activation energy of 55 meV.     

α-Zr(HPO4)2·H2O·4E5A复合粉体的制备

α-磷酸锆与正丁胺(n-butylamine,BA)、四乙烯五胺(4E5A)在去离子水中混合均匀,0～25℃下搅拌6 h,制得具有捕收甲醛功能的层状复合粉体α-ZrP-4E5A.研究了物料用量及反应条件对插层产物收率的影响,并对产物进行了分析、表征,结果表明α-磷酸锆插层产物热稳定性较好,对甲醛的捕收率较高.     

Hydrothermal synthesis of Zn_4SO_4(OH)_6·5H_2O and its application as anode material for nickel/zinc batteries

1　INTRODUCTIONNickel/zincbatteryhassuperiorperformancetobothlead/acidandnickel/ironbatteries .Thereport edspecificenergiesareusually 5 5 75W·h·kg- 1,theoverallcharge/dischargeenergyefficiencyisgood(>70 % )andthebatteryhasexcellentlow tempera tureperformance(a 15 0A·hcelldischargedat - 18℃delivers 80 %oftheenergyavailableat 2 5℃) [1] .Thiscompareswithonly 5 0 %forlead/acidbatteries ,therefore ,thenickel/zincbatteryisveryattractiveforelectricvehicleapplications[2 ,3] .Themainproblemi…     

Quantum interference and Shubnikov–de Haas oscillations in β″-(ET)4(H3O)[Fe(C2O4)3]·C6H4Cl2 under pressure

Magnetoresistance oscillations of the quasi-two dimensional charge transfer salt β″-(ET)₄(H₃O)[Fe(C₂O₄)₃]·C₆H₄Cl₂ are investigated in pulsed magnetic fields of up to 55 T, under an applied pressure of 0.5 GPa. As it is the case at ambient pressure, data are in agreement with the coexistence of a Shubnikov–de Haas orbit and a quantum interference path with the same cross section. As a result, oscillations are observed at temperatures as high as 25 K.     

The electrical conductivity and anisotropy of the molecular metal: Cs0.82[Pd(S2C2(CN)2)2]·0.5H2O

Results are presented for electrical conductivity measurements in two orthogonal directions in the molecular conductor Cs_0.82[Pd(S₂C₂(CN)₂)₂·0.5H₂O. The conduction band in this complex is believed to be via overlap of π orbitals based on the dithiolate ligands. The electrical conductivity measurements were made using the Montgomery analysis technique which compensates for the geometric shape of the crystal. Electrical conduction was found to be typically 11.0⁻¹ cm⁻¹ along the crystal (a axis) and l.0Ω⁻¹ cm"1 across the crystal (c axis). These measurements therefore give an anisotropy of around 11. The conductivity was recorded between 300 and 90 K.     

A study of the relationship between the phase transitions and transport properties in Zn0.81[Pt(C2O4)2]·6H2O

An investigation into the variation of the intensity of the satellite reflections with temperature in Zn_0.81[Pt(C₂O₄)₂]·6H₂O is reported. The first appearance of satellites corresponds to a big fall in conductivity and a large change in the thermopower, even though the intensity of the satellites is quite weak. The phase transition from Cccm to Pccn space group results in the appearance of new satellites and further large changes in both conductivity and thermopower.     

Zn(NO3 ) 2 ·6H2O,Na2MoO4 ·2H2O 与 Na5P3O10对 1Cr18Ni9Ti 的协同缓蚀作用

目的研究硝酸锌、钼酸钠及三聚磷酸钠之间的协同缓蚀作用机理,使其在性能上实现互补。方法以酸性高锰酸钾溶液为基础,通过极化曲线和失重法实验,研究3种缓蚀剂对1Cr18Ni9Ti奥氏体不锈钢的协同缓蚀作用。结果硝酸锌和三聚磷酸钠以抑制不锈钢的阴极反应为主,钼酸钠则主要抑制不锈钢的阳极反应。硝酸锌与钼酸钠表现出明显的拮抗作用,导致缓蚀效果变差。只有当三聚磷酸钠加入后,三者之间才表现出了良好的协同作用,使总的缓蚀性能达到最优,复配后的缓蚀效率可以达到90%以上。结论硝酸锌、钼酸钠及三聚磷酸钠之间存在良好的协同缓蚀作用,可以明显降低1Cr18Ni9Ti不锈钢在酸性高锰酸钾溶液中腐蚀速率,从而延长设备的使用寿命。     

Microwave-assisted solid-state decomposition of La[Co(CN)6]·5H2O precursor: A simple and fast route for the synthesis of single-phase perovskite-type LaCoO3 nanoparticles

Pure and single-phase nanoparticles of perovskite-type LaCoO₃ were prepared via microwave-assisted solid-state decomposition of La[Co(CN)₆]·5H₂O precursor in the presence of CuO powder as a strong microwave absorber within a very short reaction time of 10 min. Product was characterized by X-ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FT-IR), Raman spectroscopy, UV–visible spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and surface area measurement. The method is simple, fast and energy efficient and resulted in fine particles (10–30 nm) with high specific surface area and narrow size distribution. This hybrid microwave heating route is promising for the synthesis of other mixed oxide and related compounds.     

Novel packing type of ET radical cation layers in a new organic conductor (ET)5[Dy(NCS)6NO3]·C2H5OH with a metal-complex lanthanide anion

A new radical cation (ET)₅[Dy(NCS)₆NO₃]·C₂H₅OH salt was prepared by electrochemical oxidation of ET in a chlorobenzene–ethanol solution. Its crystal structure and conducting properties were examined. The salt has a layered crystal structure with a basically new packing type of the radical cation layer, which was called an ω-type. Resistance studies reveal a semiconducting nature of this salt.