Complexing properties of methyl and phenyl glycine derivatives in their compounds with H+, Ni(II), Cu(II), and Zn(II)

The influence of the solvent and the substituents on the complexing properties of methyl and phenyl glycine derivatives is discussed. On the basis of a computer analysis of potentiometric titration results, the composition and the stability constants of the complexes ofN-methylglycine,N,N-dimethylglycine,N-phenylglycine and phenylglycine with H⁺ and with Ni(II), Cu(II), Zn(II) were determined. The ligand-metal coordination mode as well as the zwitterion level in percent in ligand/proton systems were determined by spectral analyses and equilibria studies.

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Komplexbildung der Methyl- und Phenylglycin-Derivate in ihren Verbindungen mit dem Proton und Ni(II), Cu(II) und Zn(II)

Zusammenfassung Der Einfluß des Lösungsmittels und der Substituenten auf die komplexbildenden Eigenschaften der Methyl- und Phenylglycin-Derivate wird diskutiert. Anhand einer Computer-Analyse von potentiometrischen Daten wurden die Zusammensetzung und die Beständigkeitskonstanten der Komplexe vonN-Methylglycin,N,N-Dimethylglycin,N-Phenylglycin und Phenylglycin mit H⁺, Ni(II), Cu(II) und Zn(II) festgestellt. Mittels spektroskopischer Methoden und Gleichgewichtstudien wurde der Koordinationstyp des Liganden mit dem Metall festgestellt sowie der Prozentanteil des Zwitterions im Ligand/Proton-System.

     

流动注射分光光度法测定微量铜的研究

研究了在ＴｒｉｔｏｎＮ－１０１存在下，２－羟基－３－羧基－５－磺酸基苯重氮氨基偶氮苯（ＨＣＳ－ＤＡＡ）显色流动注射光度测定微量铜的新方法，用ｐＨ０．４～１１．５Ｎａ２Ｂ４Ｏ７－ＮａＯＨ缓冲溶液作载流，ＨＣＳＤＡＡ和ＴｒｉｔｏｎＮ－１０１的混合试剂作试剂流，采双道流路，５３０ｎｍ检测反应生成红色配合物，方法线性范围是０．０２４～０．２０μｇ／ｍＬ，检出限为８ｎｇ／ｍＬ，进样频率为１００样次／ｈ，直接     

A Novel Hybrid Solid Constructed from Tetramolybdate and Copper Complexes with Mixed Ligands: [{(Cu·phen)2(tp)}{(Cu·phen·H2O)2(tp)}{Mo4O14}]

A novel copper molybdate with mixed ligands, [{(Cu·phen)2(tp)}{(Cu·phen·H2O)2(tp)}{Mo4O14}] (phen=1,10-phenanthroline, tp=terephthalate) 1, has been hydrothermally synthesized and structurally characterized. The crystal belongs to monoclinic system, space group P21/c with a=13.1711(7), b=19.6132(10), c=13.6910(7) (A), β=117.6870(10)°, V=3131.8(3)(A)3, Z=2, C64H44Cu4Mo4N8O24, Mr=1946.99, Dc=2.065 g/cm3, F(000)=1920, μ(MoKα) (A) 2.198 mm-1, R=0.0810 and wR=0.2012 for 4233 observed reflections (Ⅰ ＞ 2σ(Ⅰ)). The structural analysis indicates that the title compound contains a discrete tetramolybdate cluster decorated with copper complex fragments and tp ligands bridging the clusters into a wave-like layer. The hydrogen bonding between adjacent layers further extends the compound into a 3-D framework.     

酞菁铜与Q-CdS超微粒子界面的光致电荷转移研究

半导体超微粒子与有机分子界面的光致电行转移过程是当前光化学和材料科学研究的一个活跃领域［‘，2］；研究的目的主要有两个方面，一是研究半导体超微粒子表面光致电行转移的特性；二是研究有机分子对超微粒子的光敏化作用．目前，超微粒子的功能化研究日益深入，其独特的光     

重氮化5-氨基-吡唑还原合成5-H-吡唑衍生物

5-氨基吡唑类化合物,经重氮化后,在铜粉存在下,可高收率地生成相应的5-H-吡唑衍生物。研究证明,铜粉作为还原剂直接参与了反应。为考察反应的适用范围,选用含不同取代基的5氨基吡唑衍生物进行研究,结果表明,它们均能被还原,高收率地生成相应的还原产物。该方法操作简便、反应条件温和、时间短、产物易分离纯化。     

无水醋酸镍与水杨醛肟固相配位反应的热化学研究

用新型的具有恒定温度环境的反应热量计，以６ｍｏｌ·ｄｍ－３ＨＣｌ溶液为量热溶剂，分别测定了ＨＳＡＯ，Ｎｉ（Ａｃ）２和Ｎｉ（ＳＡＯ）２，ＨＡｃ先后溶于该溶剂的溶解焓．设计了一个新的热化学循环，计算得到该配位反应的反应焓ΔｒＨ＝－８６．０７５ｋＪ·ｍｏｌ－１，并估算出了ΔｆＨ［Ｎｉ（ＳＡＯ）２，２９８Ｋ］＝－４０１．３３６ｋＪ·ｍｏｌ－１．     

醋酸十二铵的吸附和SiO2悬浮液的稳定性

（1）测定了醋酸十二烷基铵（DAA）在CAB－O－SIL上的吸附，其等温线属双平台或LS型[1－3，5]；（2）NaCl的存在使DAA的吸附增加．但不影响其低浓度下第一平台的吸附量；HCl的存在则在全浓度范围内抑制了DAA的吸附，（3）测定了CAB－O－SIL颗粒在上述各溶液中的悬浮液的稳定性；（4）根据表面形成小胶团的吸附理论（即二步模型产）[2，3，5，]，并借助电导跟踪溶液中发生的变化，满意地解释了吸附和聚沉的实验结果．     

Synthesis, crystal structure and magnetic properties of a novel complex [Cu(NIT2Py)(PDA)(H2O)]·(CH3OH)(H2O)

A novel complex [Cu(NIT2Py)(PDA)(H₂O)]·(CH₃OH)(H₂O) has been synthesized and structurally characterized by X-ray diffraction methods. It crystallizes in the monoclinic space group P2(1)/c. The structure consists of [Cu(NIT2Py)(PDA)(H₂O)] moiety, one solvent methanol molecule and one water molecule. The copper(II) ion is in a distorted octahedral environment: one nitrogen atom and one oxygen atom from the NIT2Py, one nitrogen atom from the PDA (2,6-pyridine dicarboxylic acid) and one oxygen atom from the aqueous in the basal plane; two oxygen atoms from the PDA in the axial position. The units of [Cu(NIT2Py)(PDA)(H₂O)] were connected as one dimension chain by the intermolecular hydrogen bonds. The complex exhibits intramolecular antiferromagnetic interactions between the Cu(II) ion and the NIT2Py.     

Thermal decomposition of Cd(CH3COO)2·2H2O studied by a coupled TG-DTA-MS method

The thermal decomposition of cadmium acetate dihydrate in helium and in air atmosphere has been investigated by means of a coupled TG-DTA-MS method combined with X-ray diffraction analysis. Dehydration of Cd(CH₃COO)₂·2H₂O is a two-stage process with Cd(CH₃COO)₂·H₂O as intermediate. The way of Cd(CH₃COO)₂ decomposition strongly depends on the surrounding gas atmosphere and the rate of heating. CdO, acetone and CO₂ are the primary products of decomposition in air. In helium decomposition goes by two parallel and consecutive reactions in which intermediates, Cd and CdCO₃, are formed. Metallic cadmium oxidizes and cadmium carbonate decomposes giving CdO. Some of the metallic cadmium, depending on the heating rate and the concentration of oxygen, evaporates. Acetone is partially oxidized in secondary reactions with oxygen. This revised version was published online in July 2006 with corrections to the Cover Date.     

痕量铜的合并带法流动注射分析——Fe~(3+)-S_2 O_3~(2-)-Cu~(2+)催化体系

本文基于 Cu~(2+)对三价铁离子与硫代硫酸盐反应生成深紫蓝色物质的褪色反应的催化作用采用流动注射合并带技术,建立了痕量铜(Ⅱ)的快速分析方法。方法的线性范围在0～350μg/L 检出限为10μg/L,相对标准偏差为1.68％,进样频率可达100样次/小时,具有很高的选择性。