CL-P204萃淋树脂分离铟(Ⅲ)镓(Ⅲ)锌(Ⅱ)

铟、镓作为重要的电子工业材料,在高技术领域有着广泛的应用．但是由于它们都是非常稀有而且分散的金属,至今以其为主要成份的主矿床尚未发现,它们通常是以微量的组分共生于锌矿等矿物中,因此,有关从锌矿中分离铟、镓的研究具有重要意义．由于铟、镓、锌３种离子的性...     

CL-P_(204)萃淋树脂吸萃铟(Ⅲ)的性能和机理

有关分离回收稀有金属铟和镓的研究和应用已有较多报道．过去主要是采用溶剂萃取法，但由于工业料液中钢、镓的含量很低，溶剂萃取法往往达不到高效分离回收的目的．同时由于该法使用了大量有机溶剂和革取剂，造成环境污染，这就大大限制了溶剂萃取法在分离回收钢、嫁的应用．离子交换法可以弥补溶剂革取法在工业料液中分离回收钢、嫁的这些不足，但由于该法存在着处理量小、选择性差、树脂的种类少等问题，因而该法也没能在工业上得以广泛应用．革淋树脂法兼有溶剂革取法和离子交换法的优点，克服了二者的不足，近来有人已将该法用于稀土、…     

电感耦合等离子体原子发射光谱法测定铝酸钠溶液中的镓

正镓是一种低熔点、高沸点的银白色金属,被广泛用于半导体材料、太阳能薄膜、永磁材料等电子领域。镓在地壳中的含量极少,全球储量约为23万t。镓本身不能单独形成矿物,常伴生于铝土矿、铬铁矿等中,质量分数为0.002%~0.02%,镓主要是作为其他金属冶炼的副产物提取[1]。在氧化铝生产过程中,铝酸钠溶液中的镓不断被富集,质量浓度高达     

荧光镓的电化学行为及稀土—荧光镓络俣吸附波研究

本文研究了荧光镓在PH2－10底液中的伏安行为，证实其偶氮基首先还原为氢化偶氮、，然后通过氢化偶氮的歧化反应或二电子还原生成相应的胺化物，荧光镓在汞电极上的吸附符合Frumkin等温式，在PH9．5的氯性底液中可获得稀土－荧光镓的络合吸附波,对重稀土的检测限为1．0×10^-8mol/L，测定了电活性络合物的组成及发光材料BaFCl:Ho中钬的含量。     

铝镓咔咯配合物的发光性质、堆积效应与轴向配位作用

本文合成了2种第三主族金属铝和镓咔咯配合物Al(tpfc)、Ga(tpfc)、Al(tpfc)(Py)2、Ga(tpfc)(Py)。测定了在甲苯溶液中,铝和镓咔咯的电子光谱、荧光光谱、荧光量子产率及荧光寿命。在不同溶剂作用下,铝和镓咔咯的电子吸收光谱和荧光光谱的峰位置和强度存在差异。在二氯甲烷溶液中,轴向配体吡啶能促进铝和镓咔咯的π-π堆积。不同轴向配体与金属咔咯的结合能力为:咪唑>4-甲基咪唑>吡啶,铝比镓的咔咯配合物有更强的结合轴向配体的能力。     

丙烯聚合中硅烷类外给电子体及其复配技术研究进展

聚丙烯是一类重要的通用塑料,主要用于汽车工业、家用电器、电子、包装及建材家具等领域。在现有聚丙烯工业生产中,通常加入外给电子体来影响丙烯聚合过程,达到调控产品物理性能的目的。本文对丙烯聚合中硅烷类外给电子体及其复配技术进行了综述,并对外给电子及其复配技术在聚丙烯新产品开发上的应用进行了分析。     

含在口中就熔化的金属

一提到金属 ,人们自然联想到那是坚硬、耐磨、耐高温的象征。但谁能想到世界上还有含在人的口中就熔化的金属呢 ?这就是 1871年俄国化学家门捷列夫在编制化学元素周期表时曾预言的“类铝”、1875年法国化学家布瓦博德朗从闪锌矿中离析出的金属———镓 (Ga)。如果把一小块固体镓含在人的口中 ,要不了多久 ,固体镓就熔化为液体镓 ,在嘴里滚来滚去。这是因为镓的熔点仅为 2 9.78℃ ,比正常人的体温 (37℃ )还要低几度。镓的原子序数是 31,原子量是 6 9.72 3,属ⅢA族 ,电子构型为 (Ar) 3d10 4s24 p1,氧化态为 +1、+3,固体镓为蓝灰色、液体镓…     

荧光镓的电化学行为及稀土-荧光镓络合吸附波研究

本文研究了荧光镓在pH 2～10底液中的伏安行为。证实其偶氮基首先还原为氢化偶氮,然后通过氢化偶氮的歧化反应或二电子还原生成相应的胺化物。荧光镓在汞电极上的吸附符合Frumkin等温式。在pH 9.5的氨性底液中可获得稀土-荧光镓的络合吸附波。对重稀土的检测限为1.0×10^-8mol/L。测定了电活性络合物的组成及发光材料BaFCl:Ho中钬的含量。     

硒的分析方法研究

硒是一种分散的稀有元素，它在电子工业，医疗等部门有广泛的用途和诱人的发展前景。本文介绍了一些硒的定性和定量分析方法。     

电子动量谱仪的研制和He原子结构的研究

前文指出，电子动量语学是研究原子和分子结构的一种新方法，其价值在于：它既能直接得到电子能级，又能相当直接和精细地得到各个电子态的动圭分布（屯就是动会表象中的电子波函数模方）．这些信息对量子化学等学科是极为有用的．在发达国家，电子动量语学已受到广泛的重视，但在国内还几乎是空白．虽然少数单位正在或准备开展这一工作，然而至今还没有成功的实验报导，其原因是国内还没有电子动量谱仪（Elec－tronM。nt。Spectro。ter，缩写为EMS），它是开展电子动量谱学实验的关键设备，在现阶段的国内外市场上均无产品出售，需要使…     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.