N，N-二乙基一对二甲氨基苯甲酰胺的合成

以对二甲氨基苯甲酸为原料合成了增感剂N，N-二乙基-对二甲氨基苯甲酰胺，其结构经IR，UV和MS确认。     

脯氨酸催化的不对称Aldol反应的研究进展

不对称合成是手性药物制备的核心环节,A ldol反应是重要的形成C—C键的反应之一,在全合成中有广泛应用.脯氨酸的两个异构体均价廉易得,作为一个非金属不对称催化试剂,它催化的不对称A ldol反应立体选择性高,有很好的应用前景.本文就近二十年来脯氨酸催化A ldol反应的机理,溶剂效应,最新进展三方面进行了介绍.     

Dendritic Macroinitiator for the Ring—Opening Polymerization of γ—Benzyl L—Glutamate N—Carboxyanhydride

Much effort has been dedicated to the molecular design and synthesis of model proteins to define protein folding interactions and to develop protein-based materials. Among them, the ring-opening polymerization of -amino acid-N-carboxyanhy- drides (NCAs) has drawn much attention because the resulting artificial polypeptides have wide applications in biotechnology, biomineralization and diagnostics1, 2. It is well known that dendrimers are hyperbranched macromolecules possessing a very high co…     

Controllable self-assembly of parallel gold nanorod clusters by DNA origami

We demonstrate the self-assembly of three types of parallel gold nanorod clusters using a rod-like DNA origami as the template.     

哺乳妇女血、乳中三种元素含量检测

研究了哺乳期母体内血、乳中锌、铁、钙三种元素含量的检测。探讨了用一定量的基体释放剂，取少量血液、乳液经大倍数稀释，直接于原子吸收仪上进行测定。此法快速、准确、实用。     

线性低密度聚乙烯在与丁苯橡胶的共混体系中的结晶行为

本工作采用DSC、X-射线衍射、小角激光光散射、偏光显微镜等手段,研究了线性低密度聚乙烯/丁苯橡胶共混体系中聚乙烯的结晶结构、平衡熔点和结晶动力学。     

Hydrothermal Synthesis of Two New Transition Metal Coordination Polymers with Mixed Ligands

Hydrothermal reactions of 1, 2, 4‐benzenetricarboxylic acid, 1, 10‐phenanthroline and transition metal cations including Zn^II or Co^II, in basified aqueous solution gave rise to two complexes, [Zn₃(btrc)₂(1, 10‐phen)₂(H₂O)₂]_n ( 1 ), and [Co₃(btrc)₂(1, 10‐phen)₂(H₂O)₂]_n ( 2 ) (btrc = 1, 2, 4‐benzenetricarboxylate, and 1, 10‐phen = 1, 10‐phenanthroline). 1 2 crystalize isotypically in the triclinic space group P1¯. The btrc ligand acts as multi‐dentate bridging ligand in both compound 1 and 2 to link up transition metal atoms into lamella networks, which are further attached into three‐dimensional frameworks through complex hydrogen bonding and π‐π interactions. The photoluminescence spectrum for compound 1 has also been studied. The corresponding reaction with Cu²⁺ follows another pathway.     

从聚丙烯流动曲线估算分子量分布

聚丙烯的控制降解技术由于能够带来很好的经济效益，国内外都在进行研究．其中分子量分布是一个重要数据，它对于聚丙烯的注塑、纺丝、薄膜等加工过程都有重要的影响．分子量分布一般用重均分子量Mw和数均分子量Mn之比D=Mw/Mn来表征，称为分子量分布指数．它可以     

The preparation of a new polysiloxane copolymer with glucosylthioureylene groups on the side chains

A new polysiloxane with pendent sugar units was prepared by a two-step method: the preparation of the polysiloxane with amino groups on the side chain and then the copolysiloxane reacted with glucosyl isothiocyanate. All polymers were characterized by FT-IR 1H-NMR, 1H-1H-COSY, 13C-NMR, and DEPT respectively. In the same time, Platinum oxide was found to be a versatile and powerful hydrosilation catalyst in the hydrosilylation reaction of aminotrimethylenepolysiloxanes with heptamethylcyclotetrasiloxane (D₄^H).     

Determination of total phenols in environmental wastewater by flow-injection analysis with a biamperometric detector

A flow injection (FI) method with a biamperometric detector, based on the biamperometry for an irreversible redox couple, is described for the determination of phenols in environmental wastewater. The method relies on coupling of the oxidation of phenols at one platinum-wire electrode with the reduction of MnO4- at another platinum wire electrode to enable biamperometric detection with an applied potential difference of 0 V. The linear dynamic range for the dependence of current on phenol concentration was from 1.0 x 10(-6) to 1.0 x 10(-4) mol L(-1), with a detection limit of 4.0 x 10(-7) mol L(-1) (signal-to-noise ratio, S/N=3). In comparison with the 4-aminoantipyrine (4-AAP) standard method and the 3-methyl-2-benzothiazoline hydrazone (MBTH) method the proposed method can be used to detect many para-substituted phenols that do not react with 4-AAP and MBTH, and response factors are higher for most of the phenols tested. The method, which is simple, economic, and rapid (180 samples h(-1)), has been applied to the analysis of four wastewater samples. The results obtained were compared with those from 4-AAP method. The recoveries obtained by adding phenol standards to samples ranged from 94.3 to 105.2% with a standard deviation of 3.6%.