共沉淀分离富集-ICP-AES测定饲料级硫酸铜中微量As和Pb

在氨性介质中 ,以硫酸铁铵作共沉淀剂 ,预富集硫酸铜中的微量砷、铅 ,ICP- AES测定砷、铅的含量。方法检出限可满足日常分析的需要。加标回收率 As95 .0 %— 98.8% ;Pb96 .9%— 97.5 % ;相对标准偏差As4 .4 % ;Pb5 .8%。     

微波消解-FAAS法测定三种蒙成药中铜、铁、锰、钙和镁

微波消解 -火焰原子吸收分光光度法测定蒙成药中 5种金属元素。实验结果表明 ,微波消解方法简便 ,消化时间短 ;测试方法具有较好的精密度和准确度     

电感耦合等离子体质谱、中子活化分析及其它谱学方法测定环境、生物样品中铝形态和含量研究进展

本文综述了上世纪90年代以来电感耦合高频等离子体质谱(ICP-MS)、中子活化分析(NAA)以及其它谱学方法测定环境生物样品中铝形态的研究进展,共引用文献60篇。     

catena‐Poly­[[(benzoato‐κO)silver(I)]‐μ‐2‐amino­pyrimidine‐κ2N1:N3]

The title complex, [Ag(C₇H₅O₂)(C₄H₅N₃)]_n, is a polymer based on a mononuclear silver(I)‐centered fragment. The Ag^I atom is trigonally coordinated by two N atoms from two 2‐­amino­pyrimidine ligands and one O atom from one benzoate anion, giving zigzag polymeric chains with an [–Ag—N—C—N–]_n backbone running along the a axis. It is proposed that intermolecular hydrogen bonding drives the formation of the chain polymer.     

A dinuclear CoII complex: bis(μ‐di­hydrogen phosphato‐κ2O:O′)­bis­[(bipyridine‐κ2N,N′)(di­hydrogen phosphato‐κO)­cobalt(II)]

The title compound, [Co₂(H₂PO₄)₄(C₁₀H₈N₂)₂], is dinuclear, centred on a symmetry centre of the P space group. Each Co atom has a distorted square‐pyramidal coordination involving two N atoms from a bi­pyridine mol­ecule and three O atoms from two bridging and one terminal di­hydrogen ortho­phosphate anion. The molecular structure and packing are stabilized by intermolecular hydrogen‐bond interactions.     

抗流感药达菲(Tamiflu)合成纵览

流行性感冒是由流感病毒引起的呼吸道疾病, 传染性很强、对人类健康构成实质性的威胁. 由于流感病毒多变, 临床上用于治疗流感的药物到目前为止仅有“达菲”等有限的几种. 本文将文献中已有报道的“达菲”的合成路线汇总并进行简要的综述.     

SYNERGISTIC EFFECT OF Cu-ZSM-5 ZEOLITE ON FLAME RETARDED PP BY MELAMINE SALT OF DIPENTAERYTHRIOL PHOSPHATE

A novel intumnescent flame melamine salt of dipentaerythriol phosphate (MDP),was prepared from dipentaerythritol (DPE) polyphosphoric acid,and melamine.The flammability,combustion behavior,and thermal degradation and stability of PP-MDP were characterized.When MDP loading was 20 wt%,LOI values of the composites reached up to 27%,and UL94 rating,V-2.PP-MDP containing 1 wt% Cu-ZSM-5 presented the highest LOI value of 30.5% and UL94 rating,V-0,and released lest heat during cone test.TG data showed that the ...     

Syntheses,crystal structures and electrochemical properties of three organic-inorganic hybrid supramolecular compounds based on copper-complex fragments and different polyoxometalates

Three new organic–inorganic hybrid compounds H[Cu^I(dafo)₂]₃{[Cu^I(dafo)₂]₂P₂W₁₈O₆₂} · H₂O (1), [Cu^I(dafo)₂]₃PMo₁₂O₄₀ (2) and [Cu^I(dafo)₂]₄SiW₁₂O₄₀ (3) (dafo = 4, 5-diazafluoren-9-one) have been hydrothermally synthesized and characterized by IR, TG and CV. Compound 1 exhibits a 3D supramolecular framework based on weak interactions between bisupported Dawson structure P₂W₁₈O₆₂ ⁶⁻ units and copper-complex fragments. With the aid of π–π stacking and hydrogen bonding interactions, a 1D supramolecular framework accommodating polyoxometalate (POM) anions is generated in 2. Compound 3 has similar fundamental units as 2, but the units are assembled in a different way. The distinction of their structures indicates that the POMs are the key factor in determining the frameworks of the final products. The electrochemical properties of these compounds have been studied using bulk-modified carbon paste electrodes. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users.     

Theoretical prediction regarding structural and thermodynamical characteristics of stable CH3PO2 isomers and unimolecular decomposition mechanisms of species CH3P(O)2, CH3O?PO,and CH2P(O)OH

The detailed isomerization and dissociation reaction potential energy profile of the CH₃PO₂ system was established at the UCCSD(T)/6‐311++G(3df,2p)//UB3LYP/6‐311++G(d,p) level of theory. Seventy minimum isomers were located and connected by 93 optimized interconversion transition states. Furthermore, 32 isomers with high kinetic stability were predicted to be possible candidates for further experimental detection. The bonding nature of the suggested stable isomers was analyzed while their molecular properties including heats of formation, adiabatic ionization potentials, and adiabatic electronic affinities were calculated at the G2, G2(MP2), G3, and CBS‐Q levels. Based on the isomerization and dissociation potential energy surface, possible unimolecular decomposition mechanisms and pathways of the low‐lying molecules CH₃P(?O)₂, CH₃O? P?O, and CH₂?P(?O)OH were discussed. Furthermore, the transition state theory rate constants of the primary unimolecular dissociation channels were also calculated. © 2009 Wiley Periodicals, Inc. J Comput Chem, 2009     

Synthesis and Plasmon‐Induced Charge‐Transfer Properties of Monodisperse Gold‐Doped Titania Microspheres

Functional spheres : Monodisperse gold‐doped titania spheres with tunable sizes under high concentration of titanium precursor have been synthesized by introducing trace amounts of chloroauric acid into the reaction system. Surface photovoltage, surface photocurrent, and transient photovoltage measurements (see figure) of annealed samples reveal that gold nanodots can act as both electron acceptors and donors under the illumination of different wavelengths of light.