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1.
合成了铜(Ⅱ)与苯基羧酸根[PCA-=苯甲酸根(Bz-),2-苯乙酸根(PAc-),3-苯丙酸根(PPr-),4-苯丁酸根[PBu-)]和2,2′-联吡啶衍生物(dpx:2,2′-联吡啶胺dpa、2,2′-联吡啶酮dpk、2,2′-联吡啶甲烷dpm)三大系列12种新的三元配合物。用元素分析、摩尔电导、红外光谱、1H核磁共振、差热分析等实验方法表征了它们的组成和性质。确定该系列配合物化学组成为Cu(PCA)2(dpa)、Cu(PCA)2(dpm)、Cu(PCA)2(dpk)·nH2O(n=2-4)。它们具有相似的组成和配位方式。它们的可能结构为:二个PCA-与Cu(Ⅱ)单齿配位,一个dpx与Cu(Ⅱ)N,N二齿螯合配位。dpk的羰基在金属离子Cu2+的存在下发生水化作用成dpk·H2O。用1HNMR法研究了Cu(Bz)2(dpx)·nH2O和Cu(PAc)2(dpx)·nH2O二个体系其分子内或分子间可能存在的非共价键作用。  相似文献   

2.
聚醋酸乙烯酯与铜(Ⅱ)离子的配位反应及其催化作用   总被引:2,自引:1,他引:1  
以ESR、UV和IR表征Cu(2+)离子与PVAC的配位反应。根据CUCl2·2H2O乙醇溶液与PVAc-CuCl2·2H2O乙醇溶液的电导率差值随Cu(2+)离子摩尔浓度变化的明显转析点得知,1个Cu(2+)离子大约能与PVAc4个链节单元配位。证实MMA在Cu(Ⅱ)-PVAc配合物/Na2SO3体系的聚合体是无规PMMA,得率为70%。讨论了MMA在Cu(Ⅱ)-PVAc配合物/Na2SO3体系络合催化引发下的游离基反应历程。  相似文献   

3.
林秋月  陈建荣 《分析化学》1999,27(8):920-923
研究了Tween80水溶液在(NH4)2SO4存在下,水溶性螯合剂1-(2-吡啶偶氮)-2-萘酚-磺酸与金属离子螯合物在该体系中两相间的分配行为。结果表明,Pd(Ⅱ),Co(Ⅱ),在pH2.0-3.5缓冲溶液中可被Tween相完全萃取,而Zn(Ⅱ),Cd(Ⅱ),Mn(Ⅱ),Al(Ⅲ)基本上不被萃取。  相似文献   

4.
研究了二-(邻-甲苯基)硫卡巴腙(简写为H2DMBDz)与Pb(Ⅱ)和Cd(Ⅱ)配合物体系的二阶导数吸附极谱波。在pH6.0的HAc-NaAc介质中,Pb(Ⅱ)-(H2DMBDz)和Cd(Ⅱ)-(H2DMBDz)2配合物分别于-0.52V(υs.SCE)和-0.65V(υs.SCE)电位处产生一良好的可逆吸附极谱波。峰电流I″p1和I″p2分别与Pb(Ⅱ)的浓度c1和Cd(Ⅱ)的浓度c2在0.01  相似文献   

5.
对镍铜甲烷部分氧化催化剂的制备化学研究表明,在Al2O3、SiO2、MgO、TiO2、Y型分子筛等载体中,具有较好氢溢流功能的Al2O3所担载的镍铜催化剂,有最佳的反应性能,载体的产物溢流功能对反应中合成气的生成是有利的.对于NiO-CuO-Al2O3催化剂,组分Cu的最佳含量是Cu/Al=0.2/4(原子比),Ni/Al(原子比)在1/4-1.5/4范围内催化剂均保持最佳的反应性能,此时,甲烷转化率为98.1%,对CO、H2的选择性分别达97%、100%.制备方法对催化性能影响的结果显示,以(NH4)2CO3为沉淀剂的共沉淀法,是制备NiO-CuO-Al2O3催化剂的最佳方法.NiO-CuO-Al2O3催化剂的甲烷部分氧化性能在400-500℃间有一突跃,并在700℃时达到最佳值;过高的反应气空速对CO、H2的选择性是不利的  相似文献   

6.
多联吡啶钴(Ⅱ)、锰(Ⅱ)配合物的合成及结构   总被引:2,自引:0,他引:2  
报道了3个取代多联吡啶配体「4-苯基-2,2′6′,2″-三联吡啶(L1),4′,4″-二苯基-2,2′:6′,2″:6″,2-四联吡啶(L2)和4′,4″-二苯基-2,2′:6′,2″:6″,2:6,2:6,2-五联吡啶(L3)」的4个过渡金属配合物「Co(Ⅱ)(L1)2」(C1O4)2(CH3CN)(1),「Co(Ⅱ)(L2)(AcO)(H2O)」(C2O4)(2),「Mn(Ⅱ)(AcO)(L2)  相似文献   

7.
含氨茂铁异核金属配合物合成和性质研究   总被引:1,自引:1,他引:0  
Pd(Ⅱ)、Pt(Ⅱ)DMAF配合物已合成,并已定结构。本文采用MX2(M-Ni(Ⅱ),Co(Ⅱ),Zn(Ⅱ)、Cu(Ⅱ);X=Cl,Br,I)在CH2Cl2中和DMAF作用合成[MX2.2DMAF]型配合物。由NiCl2.2DMAF.C7H8晶胞参数推知属于对称链状四配位结构。IR谱表明,该化合物化学式为MX2.2DMAF。CV表明配合物中M(Ⅱ)和Fe(Ⅱ)存在。由于金属离子互相影响。Ep/2  相似文献   

8.
本文分别用聚环氧氯丙烷和聚2-氯乙基缩水甘油醚/与硫化钠反应,合成了二种含硫杂环的聚醚型螯合树脂,并研究了它们对Au(Ⅲ)、Pd(Ⅱ)、Pt(Ⅳ)、Ag(Ⅰ)、Hg(Ⅱ)、Cu(Ⅱ)和Zn(Ⅱ)的吸附性能。结果表明,该树脂在一定的酸度范围内或在EDTA存在下对Au(Ⅲ)、Ag(Ⅰ)等贵金属离子及Hg(Ⅱ)有良好的吸附性,而基本上不吸附Cu(Ⅱ)和Zn(Ⅱ),用含1-10%硫脲的0.1mol/L盐酸  相似文献   

9.
研究了一些流动载体对以二-(2-乙基己基)磺化琥珀酸钠(AOT)为表面活性剂、正庚 烷为油性溶剂的W/O型微乳状液在迁移痕量金属离子Cu2+的影响。实验结果表明,1-(2-吡 啶偶氮)-2萘酚(PAN)能大大促进 Cu2+的迁移,使其迁移率从 70%上升到 100%。用高盐度 溶液对微乳进行破乳,得到 Cu2+的富集倍数为 6,回收率约为 100%。  相似文献   

10.
研究了四元体系CsCl-LaCl3-HCl-H2O(25℃、「HCl」=13%(wt),23%(wt)和CsCl-LaCl3-HAc-H2O(30℃,「HAc」=42%(wt))的平衡态的溶度数据,并给出制了相应的溶度图,共得到了CsCl.LaCl3.4H2O、2CsCl.LaCl3.2H2O和3CsCl.LaCl3.3H2O3种化合物。对得到的新相进行了热分析,X射线粉末衍射及偏光性质的测定,依  相似文献   

11.
多环芳二酐型聚酯亚胺膜的透气性能李悦生,丁孟贤,徐纪平(浙江大学高分子科学与工程研究所,杭州,310027)(中国科学院长春应用化学研究所)关键词聚醚酰亚胺,聚酯酰亚胺,膜,透气性通常的聚酰亚胺加工性能较差,在芳环二酐的苯环间引入醚键等柔性基团后,其...  相似文献   

12.
13.
A QuEChERS (quick, easy, cheap, effective, rugged, and safe) method for the determination of benazolin-ethyl and quizalofop-p-ethyl in rape and soil by high-performance liquid chromatography-tandem mass spectrometry has been developed in this study. The residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil were determined with the developed method. The half-lives of benazolin-ethyl in rape straw and soil were 3.7–5.1 days and 14.3–26.3 days, respectively. The half-lives of quizalofop-p-ethyl in rape straw and soil were 5.0-6.1 days and 0.3–9.7 days, respectively. The residue of benazolin-ethyl and quizalofop-p-ethyl in rapeseed and soil were below the detection limit (i.e., 0.5?mg?kg?1, the maximum residue level of European Union for quizalofop-p-ethyl).  相似文献   

14.
微量元素与疾病诊断治疗的研究现状及展望   总被引:8,自引:0,他引:8  
对国内外微量元素与疾病的关系及其诊断治疗的研究现状及研究动向进行了综述,包括:微量元素与地方病、癌肿、心血管病、糖尿病、眼病、神经系统病等。参考文献72篇。  相似文献   

15.
Herein, we present the synthetic route and the photophysical, electrochemical as well as laser properties of novel red‐emitting boron‐dipyrromethenes (BODIPYs) bearing arylethyne moieties. Such functionality is added along the main axis of the chromophore leading to single‐ and double‐substituted derivatives. The relationship between the dye structure and the lasing properties is studied in detail with the help of the photophysical and electrochemical properties as well as quantum mechanical simulations. The asymmetric substitution of the parent dye induces inhomogeneities in the charge distribution, which leads to an overall loss of the fluorescence capacity, mainly in polar media. Such non‐radiative deactivation processes can be softened by decreasing the electron‐donor ability of the substituent or even avoided by symmetrical substitution. Thus, grafting of the arylethyne moieties at the longitudinal axis of the indacene core results in an effective strategy to develop red‐edge BODIPYs with highly efficient and photostable laser emission.  相似文献   

16.
The monomeric ν(N—H) vibrations of various trisubstituted ureas of the R2UPh type and -thioureas of the R2TUPh type have been studied. The trans—out isomerism in the former and the trans—out—cis isomerism in the latter are discussed from the point of view of steric effect. The monomeric ν(N—H) vibrations of RPhUPh and RPhTUPh are also examined. The single band appearing in the spectrum of both ureas is characteristic of the cis form; this suggests the existence of phenyl—phenyl interaction (the stacking interaction proposed by Galabov et al. [10]). Behavior of ν(N—H) vibrations at several concentrations is shown to be clearly different in the three forms (trans, out and cis). The presence of the cis form is confirmed by solvent effect experiments.  相似文献   

17.
In this work, ferrocene- and ferrocenium-containing salts were employed to modify montmorillonite. X-ray measurements show an increase in the interlayer spacing upon clay modification, which means that the larger and more organophilic cations were inserted into the gallery space of montmorillonite. Attempts to prepare nanocomposites of polystyrene and ethylene vinyl acetate copolymers lead to immiscible systems; the morphology of these systems was elucidated with TEM, XRD and cone calorimetry. The thermal stability of the composites is greater than that of the virgin polymer.  相似文献   

18.
朱劲波  马立群  梁飞  苗迎春  王立民 《应用化学》2015,32(11):1221-1230
Ti-V基储氢合金在室温、常压下即可表现出良好的储氢特性,且质量储氢容量明显高于传统AB5型储氢合金,从而在氢气的精制和回收、运输和储存及热泵等方面有较早的应用。 此外,在混合气体分离、核反应堆中处理氢的同位素、镍氢电池及燃料电池负极材料等方面也得到了广泛的研究与关注。 基于目前Ti-V基储氢合金的研究现状,概述了该类合金的优势、限制性因素(包括成因)及改性手段。 此外,为了进一步理解Ti-V基合金储氢机理、构建合金组分与储氢特性之间的对应关系,本工作重点围绕Ti-V基储氢合金及其氢化物的结构、组分优化设计展开综述,并对其未来研究方向做出展望。  相似文献   

19.
钒与糖代谢及糖尿病   总被引:1,自引:0,他引:1  
微量元素钒作为生物体内必需元素,经证实有很重要的生理学功能,与机体糖代谢有十分密切的关系,且能降低糖尿病动物模型的高血糖,极有可能被开发为治疗糖尿病的药物。  相似文献   

20.
Neutral nickel(II) and palladium(II) complexes bearing β-ketoiminato ligand have been synthesized. The two complexes have been investigated as catalyst for the polymerization. Using methylaluminoxane (MAO) as a cocatalyst, both complexes produce vinyl-addition polynorbornenes, but palladium(II) complex displays much higher activity up to 8.0 × 107 g/(molPd h). Furthermore, both Ni(II) and Pd(II)/MAO system can efficiently copolymerize norbornene and 5-norbornene-2-yl acetate (NB-OCOMe) in moderate yields and in relatively high molecular weights. The analyses of the product by FTIR, 1H NMR and 13C NMR spectra give the verification of vinyl addition copolymer. The copolymers show narrow molecular weight distribution and good solubility in common organic solvents.  相似文献   

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