Synthesis of substituted indenyl lanthanide chloride and molecular structure of [(C5H9C9H6)(2)Yb(mu-Cl)(2)Li(Et2O)(2)]

Reaction of anhydrous ytterbium trichlorides with 2 equiv. of cyclopentylindenyl lithium in THF solution, followed by removal of the solvent MO. crystallization of the product from diethyl ether, affords a crystal complex of the composition (C5H9C9H6)(2)Yb(mu-Cl)(2)Li(Et2O)(2). Crystallographic analysis shows that the ytterbium coordinated by two cyclopentylindenyl rings and lithium surrounded by two ether molecules are bridged by the two chlorine atoms and Yb, U and two chlorine atoms form a plane.

超细Mo-Co-K催化剂的制备及其选区电子衍射表征

中国科学院山西煤炭化学研究所

Studies on enzymological properties of antibody elicited by meso-tetra(alpha, alpha, alpha, alpha-O-phenylacetyl benzene)porphyrin

meso-Tetra (alpha, alpha, alpha, alpha-O-phenylacetyl benzene) porphyrin was used as a complete antigen to elicit monoclonal antibody 1F2 through the immunization and cell fusion techniques. McAb 1F2 obtained was demonstrated very pure by HPLC and MALDI/TOFMS. The retention time of McAb 1F2 was 2. 63 min. The subtype of McAb 1F2 was IgG2a. The relative molecular weight was 156 678. 8. When the McAb 1F2-porphyrin was formed, the maximal absorption of the porphyrin soret region had a redshift from 408 to 416 nm and hyperchromical effect, showing that the antigen-antibody combination was rigid and intense, and the abzyme constancy was high. But compared with HRP, the activity of the abzyme was only 4. 687 5 U/mg and 1. 899 % of that of HRP. Its K-m was 20. 29 mmol/L, k(cat) 396. 82 min(-1), k(cat)/K-m. 1. 955 7 X 10(4) L . mol(-1) . min(-1).

Improved size control of large palladium nanoparticles by a seeding growth method

A new approach to the preparation of large palladium nanoparticles with diameters between 25 and 100 nm is presented. In this approach PdCl42- ions are reduced on the surface of performed 12-nm-diameter gold "seeds'' by the introduction of ascorbic acid. The resultant particles exhibit improved monodispersity relative to previous work. Interestingly, these nanoparticles possess Au-Pd core-shell structures. The method can be scaled up to produce 50-110 mg of large palladium nanoparticles.

聚琥珀酸丁二酯的辐射交联及其生物降解性

对聚琥珀酸丁二酯 (PBS1)采用两步法辐照 ,比其它辐照法得到的凝胶含量高 ,这是由于在室温下预先辐射所形成的交联网络结构减少了聚合物的降解。交联后的PBS1有较高的耐热变形性。通过酶降解试验和土埋法降解实验 ,PBS1有很高的生物降解性 ,即使它产生了很高的交联结构。在 6 5℃时 ,酶的降解率最高。由于交联样品所含有的交联网络结构阻碍它的降解 ,交联PBS1的生物降解失重低于未交联样品。

电中性的GdDTPA双酰胺衍生物作为MRI造影剂

1988年德国卫生局批准(NMG)_2[Gd(DTPA)·H_2O]可作为 MRI 造影剂临床应用(商品名为 Magnevist),NMG 为 N-甲基葡萄糖胺根。从药物动力学角度看,Gd(DTPA)具有弛豫性强、毒性小、细胞外分布、不通过正常的血脑屏障、迅速由肾脏排出、在人体内结构稳定、具有高溶解度等特征。Gd(DTPA)对中枢神经系统病变增强效果良好,但是组织分布无特异性,对腹部器官如肝脏、脾脏的成像效果较差。为了改善其器官选择性,而且使生物体更易接受,减少毒副作用,人们在电中性的 GdDTPA 衍生物方面作了许多努力。

Hydrothermal synthesis and crystal structure of sandwich-like heteropolymolybdophosphates

Sandwich-like heteropoly molybdochromophosphates of supermolecular compound [NH3(CH2)(6)NH3](2)H-3{Cr[Mo6O15(HPO4)(H2PO4)(3)](2)}. 4H(2)O has been hydrothermally synthesized and the single crystal structure has been determined by X-ray diffraction. The crystal data are has follows: triclinic, space group P (1) over bar a=12.156(2), b=12.809(3), c=13.530(3) Angstrom, alpha=102.46(3)degrees, beta=93.67(3)degrees, gamma=93.46(3)degrees, V=2046.9(7) Angstrom(3), Z=1, M-r=2768.69, D-c=2.246 g/cm(-3), F(000)=1337, mu=2.162 mm(-1). The structure has been refined to R=0.0666 and wR=0.1745 by full-matrix least-squares method. The title compound is composed of 1, 6-diaminohexane, water molecules, and {Cr[Mo6O15(HPO4)(H2PO4)(3)](2)}(7-) anion which consists of six oxygen atoms from two [Mo6P4] units with a sandwich-like transition metal atom Cr located at the center of symmetry.