Kinetics of formation of a linear polymer-polymer network system in the presence of 3d metal chelates

For semi-interpenetrating polymer networks (semi-IPNs) based on an incompatible polyurethane network/linear polymethylmethacrylate pair formed in situ in the presence of 3d metal chelates, we have studied the effect of the system composition on the kinetics of formation of the components and the nature of complex formation between the metal compound and the polymer matrix. The ratio of the system components has been shown to have an effect on the selection of the macroligand in formation of complexes of the metal chelate with the polar groups of the semi-IPN, where the general character of the kinetic behavior for the formation of the network and the linear polymer is preserved. __________ Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 42, No. 6, pp. 351–356, November–December, 2006.     

差热分析(DTA)法研究五水硫酸铜的失水过程

关于五水硫酸铜的失水过程有不同的说法。归纳起来,主要有以下几种:1.五水硫酸铜的失水过程分三步进行,即     

磷酸三丁酯增敏极谱法测定铜的研究

在０．００４ｍｏｌ／Ｌ ＨＣｌ－１×１０＾－３ｍｏｌ／Ｌ ＳＣＮ＾－－５×１０＾－５ｍｏｌ／Ｌ磷酸三丁酯（ＴＢＰ）溶液中，Ｃｕ＾２＋可在－０．４２Ｖ（ｖｓ．ＳＣＥ）产生灵敏的极谱波，波高较无ＴＢＰ存在时增加近３倍，二阶导数峰电流与０．００５￣４．０ｍｇ／Ｌ Ｃｕ＾２＋呈线性关系。研究了极谱波性质及增敏机理，表明该极谱波为配合物吸附波，ＴＢＰ起协同吸附作用。本法已用于实际样品分析，结果满意。     

新型含葡萄糖基手性Salen配体及其Mn3+、Fe3+、Co2+、Cu3+配合物的合成与表征

A novel chiral Salen ligand with a glucose moiety was synthesized from the condensation of 1,2:5,6-di-O-isopropylidene-3-O-methylene-[5-(3-tert-butyl-2-hydroxy benzaldehyde)]-α-D-glucofuranose with (1R,2R)-1,2-diaminocyclohexane. Several chiral complexes of Mn³⁺, Fe³⁺, Co²⁺ and Cu²⁺ were prepared from this ligand. Both the ligand and the complexes were characterized by elemental analysis, NMR, IR, MS, and UV-Vis.     

9-羟基-芴-9-羧酸双核铜配合物[Cu(C_(14)H_8O_3)(C_9H_7N)(C_2H_5OH)]_2的合成、晶体结构及热稳定性研究

在自然界中,α-羟基羧酸广泛的存在于动植物体内,在羧酸循环、碳水化合物代谢和氨基酸的合成中起到重要的作用。Tapscott等详细总结了有关羟基羧酸及其金属配合物的合成化学[1]。芴的9位上2个氢原子被羟基和羧基取代可生成9-羟基-芴-9-羧酸(简称芴酸),它是α-羟基乙酸的衍生物,是一种具有生理活性的植物生长整形素,它能够延缓植株生长,影响植株根的向地性和茎的向光性[2]。由于芴酸含有羟基和羧基两种不同的氧配位原子,使其又可以作为一种潜在的构筑配合物的组织基元。目前有关芴酸与金属离子的合成与结构化学研究相对较少,仅见铜、镉的单…     

CuZnAl水滑石衍生催化剂上甲醇水蒸气重整制氢Ⅲ.合成水滑石用金属盐的影响

采用共沉淀法,用不同金属盐为Cu源和Zn源合成了一系列CuZnAl水滑石,以此为前体经600℃焙烧后制得相应催化剂.用硝酸盐和醋酸盐合成的水滑石结晶度高,其衍生催化剂比表面积大、Cu的分散性好且易于还原;而用硫酸盐和盐酸盐合成的水滑石结晶度差,其衍生催化剂比表面积小、Cu的分散性差且不易还原.反应评价结果显示,用硝酸盐和醋酸盐制得的催化剂活性高、反应稳定性好;而用硫酸盐和盐酸盐制得的催化剂由于低的Cu表面积以及S和Cl的毒化作用而几乎无催化活性.在醋酸盐制备的催化剂上,产物干气中CO的浓度明显较低,在250℃和WHSV=3.28 h-1的条件下约为0.03%~0.04%,仅为硝酸盐所制催化剂上CO浓度的1/5;在210℃和WHSV=0.5 h-1的条件下,该催化剂上甲醇几乎完全转化,同时CO浓度降至约0.005%.N2O滴定、CO2程序升温脱附和程序升温还原结果显示,用醋酸盐和硝酸盐制备的催化剂具有极相近的Cu表面积和表面碱性,但前者CuO的还原峰温较后者低近70℃,归因于ZnO与CuO间的强相互作用,这是催化剂具有良好选择性的可能原因.     

Characterization of the Nanoscale Microstructure of an Immersion Silver on Sputtered Copper

1 INTRODUCTION Silver and its compounds have received much attention due to their current and potential applica- tions in many areas[1, 2]. As a metal with the highest electrical and thermal conductivities, silver was one of the most important noble metals used in electrical industries in the last century. Several decades ago, however, the development of silver application in electronic area seemed not so quick. The fear for some undesirable phenomena involving silver, like “electrochemi…     

表面膨胀粘度的测定研究

用不同浓度的NaCl和表面活性剂直链的十二烷基苯磺酸钠(LAS)、稳定剂聚丙烯酰胺和水所组成的泡沫体系为研究对象,通过表面压松弛的方法,利用计算机数据拟合,得到了计算表面膨胀粘度的方法。     

Supramolecular structures of macromolecules containing bipyridine–copper(I) complexes as revealed from transmission electron microscopy studies

Transmission electron microscopy (TEM) studies on bipyridine (bpy) containing block copolymer systems showed the formation of nanoscopic polymer–ion complexes through complexation with copper(I) ions which segregated to highly ordered columnar domains of mesoscopic dimensions. The domains, i.e. stacks of [(bpy)₂Cu(I)] complex moieties could be visualized by complementary TEM techniques. First, electron energy loss spectra (EELS) showed the absorption edges of copper and nitrogen, which are specific for the bipyridine copper complexes. The element spectroscopic imaging (ESI) technique allowed the imaging of the net copper and net nitrogen distribution, and the coinciding pictures exhibited a microphase separated system in the case of a 3-block copolymer with complexed end segments. High resolution elastic bright field images showed interference lines with a line to line distance of about 8 A which could be related to the Cu–Cu distance in staggered Cu(I)–bipyridine complexes. Received: 6 August 1997 Accepted: 28 April 1998