Electrochemical properties of rare earth AB(3)-type alloy as negative electrode material in MH-Ni battery

Electrochemical properties of rare earth AB(3)-type hydrogen storage alloys as negative electrode material and a polymer instead of 6 M KOH aqueous solution as solid state electrolyte in MH-Ni battery have been investigated at room temperature and 28degreesC first time. The partial replacement of Ni by Al and Mn elements increases the specific capacity and cycle stability of the alloy.

Expert system for elucidation of structures of organic compounds (ESESOC) - Algorithm on stereoisomer generation

An algorithm for enumeration of stereoisomers due to asymmetric carbon, C=C double bond and so on has been developed. It consists of three steps. The output of stereoisomers can be represented by 2.5-dimensional connection table.

A one-pot procedure to prepare S-protected 4-iodothiophenols

By means of non-aqueous reduction of pipsyl chloride followed by treatment with K2CO3 and then reacting with acetyl chloride or benzyl chloride, S-acetyl/benzyl -4-iodothiophenols were obtained in a one-pot procedure with yield as high as 90%. These S-protected arenethiols are very important intermediates to synthesize self-assembled molecular wires.

Synthesis and electroluminescent properties of a novel terbium complex

A new carboxylic acid ligand (o-amino-4-hexadecane benzoic acid, AHBA) and a corresponding terbium complex (Tb(AHB)(3)) were synthesized and characterized. A multilayer electroluminescent device with poly(N-vinylcarbazole) (PVK), 2-(4-biphenyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole (PBD) and the terbium complex as emissive layer was fabricated: glass substrate/ITO/PPV/PVK:-To(AHB)(3):PBD/Alq(3)/Al. The photoluminescence (PL) and electroluminescence (EL) spectra were discussed. This EL cell exhibited characteristic emission of terbium ions with a maximum luminance of 35 cd/m(2) at 20 V. (C) 2000 Elsevier Science S.A. All rights reserved.

Green electroluminescence generated from the thin film based on a soluble lanthanide complex

Electroluminescent (EL) devices based on a soluble complex Tb(MDP)(3) [Tris-(monododecyl phthalate)Terbium] doped with poly (N-vinylcarbazole) (PVK), (2-(4-biphenyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole) (PBD) were fabricated. The device structures of ITO/PVK/PVK:PBD:Tb(MDp)(2)/Aiq(3)/Al and ITO/PVK:PBD:Tb(MDP)(3)/Alq(3)/Al were employed. The Tb(MDP), as emissive layer was spin-coated. The EL cell exhibited characteristic emission of terbium ion. (C) 2000 Elsevier Science S.A. All rights reserved.

Detection of anti-human serum albumin antibody using surface plasmon resonance biosensor

The biosensor based on surface plasmon resonance(SPR) technology is a very useful tool to study the interaction between biomolecles. The main advantages of this technique is to "visualize" macromolecular interactions directly in real time, and in a label-free mode rather than indirect methods like enzyme-linked immunosorbent assays (ELISAs). We immobilize human serum albumin (HSA) to the carboxymethyldextran-modified sensor chip surface covalently to detect the activity of anti-HSA in serum, and regenerate the surface with .1 mol/L phosphoric acid. The results show that SPR biosensor can detect the activity of anti-HSA in real-time quickly and the sensor chip can be used over 100 cycles.

A QSAR of the toxicity of amino-benzenes and their structures

The quantum chemical parameters and the topological indices have been calculated for the prediction of the toxicity of amino-benzenes in the environment, and work has been done on the multiple regression and neural networks. The combination of CoMFA with formation heat yields greatly improved results. A good model has been obtained which provides a basis for the studies of the toxic action mechanism.

表面等离子体共振法检测人血清白蛋白抗体活性

表面等离子体共振法是研究生物大分子间相互作用的有效方法之一，和非直接方法（如酶联免疫）相比，具有实时、快速和免标记等特点。我们在甲羧基化葡聚糖修饰的传感片表面直接交联固定人血清白蛋白（ＨＳＡ），用于ａｎｔｉ－ＨＳＡ抗体活性的检测，并用Ｈ_３ ＰＯ_４（０．１ｍｏｌ／Ｌ）溶液再生。结果表明表面等离子体共振（ＳＰＲ）生物传感器能快速实时检测ａｎｔｉ－ＨＳＡ抗体的活性，且传感片能够重复使用１００次以上。

Cationic cyclization of styrene-butadiene rubber

Controlled cyclization of styrene-butadiene rubber (SBR) was achieved with the aid of cationic catalyst system based on diethylaluminium chloride (AIEt(2)Cl) and benzyl chloride (C6H5CH2Cl) and by working in xylene solution at high temperature (T > 100 degreesC). The main parameters of the cyclization process were investigated. Elastomers with low intrinsic viscosity, ready solubility, free gel were obtained. The products were characterized with IR H-1-NMR, DSC, GPC. The polycyclic structure was determined. (C) 2001 Published by Elsevier Science Ltd.

A one-pot procedure to prepare ethynylferrocene and iodoethynylferrocene

Ethynylferrocene and iodoethynylferrocene were prepared in high yield as 88-90% through a one-pot procedure. 1, 1'-diiodoferrocenylene was in-situ prepared from reaction of CHI3 PPh3, t-BuOK and ferrocenecarboxaldehyde, further reaction with t-BuOK or n-BuLi gave the title compounds.

Rapid electron propagation through molecular wire monolayers sandwiched between two gold electrodes

Conjugated bisthioester 1 was synthesized applying Sonogashira coupling reactions. Using self-assembly in combination with nanoparticles deposition techniques, we developed a novel method to fabricate a "gold electrode-molecular wire monolayers-gold nanoparticles" sandwich-like structure. Rapid electron propagation through this sandwich-like structure was observed by cyclic voltammetry and ac impedance measurements.

Energy transfer from Ce3+ to Eu2+ and electron transfer from Ce3+ to Eu3+ in BaY2F8 : Ce, Eu systems

Phorsphors of BaY2F8 : Ce3+, BaY2F8: EU2+ and BaY2F8 : Ce, Eu were prepared by higher temperature solid reaction and their excitation, emission and diffuse reflection spectra were made. We firstly found that the competition of energy transfer from Ce3+ to Eu2+ and electron transfer from Ce3+ to EU3+ existed in CeF3 and EuF3-co-doped BaY2F8 systems. The f-f transition emission of EU2+ was increased with increasing x in systems BaY2F8 : 0. 03Ce, xEU. Ce4+ ions coexist,with Ce3+ ions and substitute Y3+ for Ce4+ in the systems BaY2F8 : Eu, Cc.

A new solid-supported iterative divergent/convergent strategy for the synthesis of dendrimers

A rapid and convenient solid-supported iterative divergent/converpent approach was developed to prepare rigid phenylacetylene dendrimers. The generation number grows very rapidly and the purification at each step is very simple. (C) 2001 Elsevier Science Ltd. All rights reserved.

Four-level decay model of P-6(7/2) excited state of Eu2+ ion in KMgF3

A four-level model of P-6(7/2) excited state of Eu2+ ion in KMgF3: Eu2+ has been proposed. The decay profiles of the P-6(7/2) excited sstate of Eu2+ are two exponential and the physical implication of each term in the fit equation responsible for the model is interpreted. The data obtained spectroscopically are in good agreement with the fit results.