Triphenylphosphine Stabilized Silver Carboxylates

A series of novel triphenylphosphine stabilized silver carboxylates, potential precursors for CVD growth of ultrafast interconnection link in microelectronic devices, have been prepared and characterized.     

Arai实测谱分布数据的应用

对Arai的靶原级谱分布数据 ,通过插值、拟合处理 ,获得适用于数值积分的Δλ =0 0 0 2nm的谱分布数据 ,建立了新的谱分布数据文件 ,应用于FPM程序中。并对耐热钢GH131进行实验研究。理论强度与测量强度的相关性良好 ;基本参数法与理论影响系数法分析结果与确认值一致 ,对Cr,Ni分析的相对误差 <1 0 %。结果表明 :经处理的Arai的靶原级谱分布数据应用于FPM程序 ,提高了分析准确性 ,并扩大了基本参数法与理论影响系数法的应用范围。     

伯胺N1923从硫酸介质中萃取La（Ⅲ）和Fe（Ⅲ）的动力学

伯胺N1923(以下简称RNH_2)是分离钍和稀土的有效萃取剂。N1923对铁(Ⅲ)和稀土(Ⅲ)萃取热力学的研究表明,在硫酸体系中加入PO_4~(3-),可使稀土(Ⅲ)和铁(Ⅲ)的分离系数增大,本文研究了N1923从硫酸介质中萃取稀土(Ⅲ)和铁(Ⅲ)的动力学性质,以推动N1923在稀土工业中的应用。 N1923由上海有机化学研究所提供,伯胺含量>99％,用等当量浓度的硫酸平衡得到实验     

Microviscosity in modified Nafion membranes measured by fluorescence probes

Sodium or quaternary ammonium modified Nafion membranes in forms of Nafion-Na+,Nafion-NMe4+,Nafion-NEt4+ and Nafion-NBu4+ have been prepared by neutralizing Nafion-H+ membrane with NaOH or tetraalkylammonium hydroxide aqueous solution.Intramolecular excimer formation and fluorescence polarization methods using l,3-di(1-pyrenyl)propane and acridine orange as probes respectively have been employed for measurements of the microviscosity within those modified Nafion membranes.Results show that the probes are located in the fluorocarbon/water interface in the cluster of the membranes and the microviscosities around the probe molecules are in the range of ca.120-1200 cp and increase in the order of Nafion-Na+相似文献   

Cyclam Modified Carbon Paste Electrode as a Potentiometric Sensor For Determination of Cobalt （Ⅱ） Ions

IntroductionThe increasing use ofion sensors in the filed ofenviromental,agricultural and medicinal analysesis simulating analytical chemists to develop newsensors for the fast,accurate,reproducible and se-lective determination ofvarious species[1] .Cobaltisa biologically essential trace element.Althoughcobalt is required only in minute amounts for main-taining normal health,a lower or higher concentra-tion of it may lead to deficiency or toxicity states,respectively,resulting in impairmentor …     

叶绿素a光诱导产生O_2~/OH氧自由基

将ESR自旋捕俘技术应用于氧的瞬时自由基测定,为叶绿素a Chα光诱导化学行为的研究,提供了更为有力的手段。Harbour和Bolton用自旋捕俘剂DMPO(5,5-Dimethyl-1-pyrroline-N-oxide)首次证明,在光照下叶绿体可产生O_2。他们又用DMPO证明,Chla于光照下有少量OH自由基产生。继而Van Ginkel于1980年报导用分离出来的     

Friedel-Crafts Acylation of Ferrocene Catalyzed by Solid Superacid, Silica-supported Polytrifluoromethanesulfosiloxane

Solid superacid, silica-supported polytrifluoromethanesulfosiloxane (SiO2-Si-SCF3) was firstly used in the Friedel-Crafts acylation of ferrocene as a novel catalyst. IR spectra, WAXD and specific surface area of the superacid SiO2-Si-SCF3 were also investigated.     

Synthesis and Crystal Structure of O-Ethyl-N-（2,3,4-tri-O-acetyl-β-D-xylopyranosyl）-thiocarbamate

The crystal and molecular structures of O-ethyl-N-(2,3,4-tri-O-acetyl-p-D-xylopyranosyl)-thiocarbamate were determined by X-ray crystallography. It crystallizes in the orthorhombic system with space group P2(1)2(1)2(1), lattice parameters a=0.90636(18) nm, b=0.94716(19) nm, c=2.1855(4) nm, V=1. 8762 (7) nm3, and Z=4. All the substituents are in equatorial positions. There are four intramolecular interactions, each forming a five-membered ring. The molecules are linked by interactions to form three-dimensional framework. Atoms O6 and O8 show positional disorder.     

Inhibitory effect of H_(3 + x)PMo_(12－x)V_xO_(40)-Ton the self-polymerization of methyl methacrylate

In this work,a series of molybdovanadophosphoric heteropoly acid quaternary ammonium salts H_(3+x)PMo_(12 -x)V_xO40-T were synthesized and employed as a reaction inhibitor in the selfpolymerization of methyl methacrylate(MMA).The polymerization inhibition effect of H_(3+x)PMoPMo_(12 -x)V_xO40-T)with different number of vanadium atoms and reaction dosages was investigated using differential scanning calorimetry(DSC).It shows that the inhibitory effect was improved with the increasing dosages of H_(3+x)PMoPMo_(12 -x)V_xO40-T),and the polymerization inhibition was also affected by the number of vanadium atoms in the H_(3+x)PMo_(12 -x)V_xO40-T .Furthermore,cyclic voltammograms(CV)was used to probe the mechanism of the inhibition reaction with H3+xPMo12xVxO40-T.The result of CV indicates that the inhibition reaction is an oxidation–reduction reaction.H_(3+x)PMo_(12 -x)V_xO40-T can react directly with the MMA monomer radicals,which eliminated the MMA monomers,and therefore the self-polymerization of the MMA can be effectively inhibited by H_(3+x)PMo_(12 -x)V_xO40-T.