Aluminium(III) as a promoter of cellular oxidation

Aluminium has been known as a neurotoxic agent to experimental animals since the last century (Arch. Exp. Pharmacol. 40 (1897) 98). However, great interest arose in it bioinorganic chemistry as well biology when it was demonstrated to be the causative agent in pathologies related to the long-term dialysis treatment of uremic subjects with renal failure (Life Chem. 11 (1994) 197), and as a potential etiopathogenic cofactor for several neurodegenerative diseases. The inorganic biochemistry of aluminium is still largely to be discovered. In this review the pro-oxidative property of aluminium toward biological membrane will be presented and its implications in involvement in human pathology will be discussed in an interdisciplinary frame from the bioinorganic point of view.     

轻稀土硝酸盐与邻菲罗啉(Phen)高配比混配配合物的合成和表征

本文采用水-有机溶剂合成了三个稀土硝酸盐与邻菲罗啉的混配配合物,通过元素分析、红外、差示扫描和热重等分析测试手段,确证了配合物的组成为Ln(Phcn)_4(NO_3)_3·3H_2O,并研究了它们的性质。     

双N—乙酸取代氮氧杂大环及其镧系配合物的合成

首次合成了一种新的1.2-双(3,4:9,10-二苯并-5,8-二氧杂-1,12-二氮杂环十五烷-N-乙酸)乙烷大环配体,制备了它的8个镧系元素(La,Pr,Nd,Sm,EU,Gd,Dy,Yb)配合物,用红外光谱、元素分析、核磁共振谱及电导等方法进行了表征,讨论了可能的配位情况。     

Ni,Pd／Al2O3对丙酮加氢一步合成甲基异丁基酮性能比较

研究了Ａｌ２Ｏ３负载Ｎｉ、Ｐｄ催化剂上丙酮加氢一步合成甲基异丁基酮的反应活性。考察了不同Ｎｉ含量和不同Ｐｄ含量对活性的影响。结果表明，在载体Ａｌ２Ｏ３中加入不同含量的ＳｉＯ２后，会改善载体的性能，Ｎｉ／Ａｌ２Ｏ３催化剂中添加稀土元素Ｌａ或Ｃｅ后可改善催化剂的稳定性。     

2，6－双（1′－苯基－3′－甲基－5′－氧代－4′－甲酰吡唑）吡啶稀土配合物的合成与表征

在乙醇－水溶液中合成了１４种２，６－双（１′－苯基－３′－甲基－５＇－氧代－４＇－甲酰吡唑）吡啶稀土配合物。元素分析确定其化学组成为ＲＥ＿２Ｌ＿３·ｎＨ＿２Ｏ，并用紫外可见光谱、红外光谱、核磁共振谱、热分析、荧光光谱、摩尔电导等进行了表征。     

Neue Pyridiniumchlorometallatverbindungen der Seltenerdelemente

Summary Reaction of the rare earth chlorides with pyridinium chloride in tetrahydrofuran (THF) under anhydrous conditions gave nearly insoluble precipitates of the composition (pyH)₃ RECl₆·THF (RE=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Tm, Yb, and Lu). They were characterized by chemical analysis and IR spectroscopy; decompositionin vacuo was studied, yielding the hithero unknown complexes (pyH)₃ RECl₆ (RE=La, Ce, Pr, Sm, Tb, Ho, Y, Tm, and Lu).

     

Development of the FTIR properties of nano-structure silica gel doped with different rare earth elements,prepared by sol-gel route

Structural characteristics of pure silica gel (silica-xerogel, SiO₂) and silica gel doped with some rare earth elements (REEs) such as, praseodymium Pr³⁺, and Europium Eu³⁺, Erbium Er³⁺ and Holmium Ho³⁺ ions, with different concentrations ranging from 1 up to 6%, in the form of monolith materials were prepared by sol-gel technique, Using tetra-ethoxysilane as precursor materials, which are of particular interest for sol-gel integrated optics applications. Some structural features of sol-gel derived monolith are analyzed, namely the structure of nano-particle momolith samples, based on X-ray diffraction (XRD) and Fourier Transform Infrared (FTIR). We show that the XRD spectra of α-crystobalite are obtained for the pure samples at 1100°C and even by doping with the four REEs ions.     

改性磁性壳聚糖微球对Cu2+、Cd2+和Ni2+的吸附性能

Fe3O4/ chitosan magnetic microspheres of 50 to 80 滋m were prepared using the inverse phase emulsion dispersion and chemical crosslinking technology, and then modified with ethylenediamine for use in the adsorption of heavy metal ions. The adsorption properties of the modified Fe3O4/chitosan toward Cu2+, Cd2+ and Ni2+ were investigated. It was found that the adsorption capacities of Cu2+ and Ni2+ increased with pH, and a maximum adsorption for Cd2+ occurred at pH=3. The saturated adsorption capacities calculated by Langmuir isotherms were 54.3 mg·g-1 for Cu2+, 20.4 mg·g-1 for Cd2+, and 12.4 mg·g-1 for Ni2+, respectively. The adsorption kinetics were well described by pseudo-second-order equation models. The experimental results showed that the Fe3O4/chitosan modified with ethylenediamine presented higher adsorption selectivity for Cu2+ than for Cd2+ and Ni2+ in all studied pH ranges.     

稀土发光材料在固体白光LED照明中的应用

固体白光发光二极管将成为21世纪新一代的节能光源. 要实现白光发射的重要途径之一是利用稀土发光材料的荧光转换技术, 把InGaN半导体管芯发射的460 nm蓝光或400 nm近紫外光转换成白光. 分别就这两种管芯报道了我们研制的发射蓝、绿、黄、红等不同颜色的稀土发光材料： YAG：Ce, Ca1-xSrxS：Eu^2＋, Ga2S3：Eu^2＋, MGa2S4：Eu^2＋（M=Ca, Sr, Ba）, SrGa^2＋xS4＋y：Eu^2＋, （Ca1-xSrx）Se：Eu^2＋, SrLaGa3S6O：Eu^2＋, （M1, M2）10（PO4）6X2, （M1=Ca, Sr, Ba; M2=Eu, Mn; X=F, Cl, Br）, NaEu0.92Sm0.08（MoO4）2, 并报道了由它们制成的白光发光二极管的色坐标、相关色温和显色指数等参数.     

块状LaNi5基纳米合金的正电子湮灭研究

利用高温高压技术，在不同的压力和温度(-4．5GPa，-800℃)下将LaNi5基快淬合金粉直接压制成了块状纳米晶合金。X射线衍射分析表明，高压使其晶粒内部发生了明显的压致晶粒碎化，其平均晶粒尺寸在4．5GPa下从75．5nm降至24．6nm。利用正电子湮灭技术研究了这种晶粒碎化效应对纳米合金内部缺陷结构的影响。测试结果表明，在高温高压的作用下，由于界面上原子的迁移和弛豫加剧，导致晶界上尺寸较大的微孔隙缺陷逐渐转化为尺寸较小的自由体积缺陷，使得纳米合金的致密度逐渐增强，显微硬度逐渐升高，从而在高温高压下得到致密的块状纳米合金材料。