配合[Cu(o-ABA)2(2,2''-bipy)]·(H2O)的水热合成、晶体结构及电化学性质

铜是生物体内重要的微量元素,广泛地存在于动物、植物和微生物体内,并且通常与生物配体形成稳定的混配配合物,在生命过程中(酶的催化、物质的储存和运送以及铜离子的转运等)起着极其重要的作用,因此研究铜生物配体配合物对探索铜在生物体内的作用机制有重要意义[1～3].     

[Cu(L-His)(Phen)]·2ClO4·H2O的合成、表征及晶体结构

铜是生物体中必需的微量元素．生物体中大部分铜与两种以上生物配体形成混配配合物,与生命过程中酶的催化、物质的储存和运送及铜离子的转运过程有关,因此研究铜的生物配体（如氨基酸等）混配配合物对探索钢在生物体中的功能性作用机制有着重要意义．目前关于氨基酸一铜（Ｉ）一邻菲咯琳混配配合物的合成及其性质研究日益为人们所关注［’－’］．本文合成了Ｌ一组氨酸、 １,１０一邻菲咯批铜（ Ｅ）配合物,并进行了表征和Ｘ射线晶体结构分析．该配合物尚未见文献报道．１实验部分１．１仪器及试剂Ｃｌｌ（ＣＩＯ。）。·６Ｈ。Ｏ按文献…     

水杨醛天冬氨酸过渡金属配合物的ESR波谱及抗O2·-性能

测定了水杨醛天冬氨酸Cu(Ⅱ)配合物在室温和低温下吡啶中的溶液ESR谱,室浊溶液谱观测到二级效应和驰豫效应,给予了理论解释,计算了弛豫参数;根据低温ESR波谱参数,计算了键参数,讨论了配合物的成键特性和稳定性。利用ESR法直接测定了水杨醛天冬氨酸席夫碱配体及其铜、锌、钴、镍配合物抗O2性能,结果表明：配体和配合物均有抗O2^-性能,配生物清除能力比配体强,其中铜配合物清除O^-2能力最强。     

1,10-菲咯啉及其衍生物铜配合物的抗癌活性研究进展

作为一种微量生命元素,铜在生物进程中扮演着重要角色,很多铜配合物呈现抑制癌细胞增殖的活性。本文论述了以1,10-菲咯啉及其衍生物为配体的铜配合物的抗癌活性研究进展,分析了其对DNA裂解的可能机理。对比顺铂类抗癌药物,展望了铜配合物作为抗癌药物的应用前景。     

稀土对氨基酸旋光度的影响

稀土在农林牧业和医学方面应用的不断扩大,导致稀土通过多种途径进入人体．为此,有必要了解稀土对生物体的近期和远期效应［１］．研究稀土与氨基酸的相互作用将为探索稀土在生物体内的代谢及其生物效应提供基础．近２０年来,稀土－氨基酸配合物的研究一直为人们所重视...     

铜（Ⅱ）－α－氨基酸配合物的离解动力学研究

铜（Ⅱ）－α－氨基酸配合物的离解动力学研究吴宝璋（厦门大学化学系厦门８６１００５）关键词铜配合物，金属－氨基酸相互作用，生物配体，配合物离解动力学铜是生命体系中最重要的微量元素之一，由于生理上的原因，动物体内铜离子的补给宜用它的配合物，而不是简单的盐...     

苯并咪唑取代胺类及其金属配合物的研究与应用

概述了双苯并咪唑取代胺类、三苯并咪唑取代胺类及四苯并咪唑取代胺类配体及其金属配合物的研究和应用。研究报道,这些配体与人体必需的微量元素铜、锌、钴、镍、锰等金属形成的配合物能较好地模拟SOD分子中与金属离子配位的组氨酸的结构,且具有较好的拟SOD生物活性。     

配位化学中的直线自由能关系(XIX)

前文[1]曾报导了侧基二氧四胺大环配体的合成及表征．与普通配合物相比，大环多胺配合物具有较高的稳定性及惰性和奇特的空间构型，其过渡金属配合物具有特殊的性质和用途，如作酶的模型、氧的载体等．铜（Ⅱ）配合物可作超氧歧化酶（SOD）的模型，超氧离子是人体内的氧代谢产物，它在体内过量积累会引起多种疾病，超氧歧化酶对超氧离子起催化歧化作用，以维持机体的正常运行间，故这种大环多胺Cu（Ⅱ）配合物具有重要的生物功能及广阔的应用前景．本文研究了四种带侧基二氧四胺大环配体-5-取代邻菲罗啉（5－Xphen；L1）铜（Ⅱ）三元配合…     

Schiff碱铜配合物的生物活性

Schiff碱及其铜配合物以良好的生物活性而被人们广泛地研究. 综述了Schiff碱铜配合物作为医药和农药的活性, 并就其发展尤其在农药方面进行了展望.     

邻香草醛缩天冬氨酸铜、锌、钴、镍配合物的合成

氨基酸希夫碱是具有多种配位原子和生物、化学活性的配体,其过渡金属配合物对生物无机化学和医药有重要意义［１～３］,我们曾报道过某些氨基酸希夫碱及其配合物的抗Ｏ－·２性能［４,５］．本文合成了邻香草醛缩天冬氨酸铜、锌、钴、镍配合物并进行了系列表征,提出其...     

铜(II)/明胶(酶解明胶)络合物的制备及其络合形态的探讨

许多金属元素对于生物体是必需的,Ｎａ、Ｋ、Ｍｇ、Ｃａ、Ｍｎ、Ｆｅ、Ｃｏ、Ｃｕ、Ｍｏ和Ｚｎ在人体中的含量约３％;各种金属离子在生物体中具有不同的作用,其功能是很复杂的．铜在生物体内主要是进行氧化还原反应,起输送氧气和电子载体的作用．如果人体内缺乏铜,则...     

Metal and cofactor insertion

Cells require metal ions as cofactors for the assembly of metalloproteins. Principally one has to distinguish between metal ions that are directly incorporated into their cognate sites on proteins and those metal ions that have to become part of prosthetic groups, cofactors or complexes prior to insertion of theses moieties into target proteins. Molybdenum is only active as part of the molybdenum cofactor, iron can be part of diverse Fe-S clusters or of the heme group, while copper ions are directly delivered to their targets. We will focus in greater detail on molybdenum metabolism because molybdenum metabolism is a good example for demonstrating the role and the network of metals in metabolism: each of the three steps in the pathway of molybdenum cofactor formation depends on a different metal (iron, copper, molybdenum) and also the enzymes finally harbouring the molybdenum cofactor need additional metal-containing groups to function (iron sulfur-clusters, heme-iron).     

Recyclable copper catalysts in the enantioselective glyoxylate-ene reaction catalyzed by chiral fluorous-tagged bis(oxazolines)

Chiral fluorous bis(oxazoline)/copper complexes have been applied to the asymmetric glyoxylate-ene reaction, giving moderate to high enantioselectivities. An efficient separation of the copper catalyst using a solid/liquid separation or the FRPSG concept, and its reuse was achieved.     

Copper—A “Modern” Bioelement

Copper is a bioessential element in biology with truly unique chemical characteristics in its two relevant oxidation states +I and +II. Significant progress has been made in recent years in the elucidation of the frequently surprising biochemistry of this trace element. Those advances were especially furthered through mutual stimulation involving results from biochemistry, molecular biology, and medicine on one hand and the synthesis as well as the structural and spectroscopic characterization of low molecular weight model complexes on the other. The most notable features of protein-bound active copper are its almost exclusive function in the metabolism of O₂ or N/O compounds (NO, N₂O) and its frequent association with oxidizing organic and inorganic radicals such as tyrosyl, semiquinones, superoxide, or nitrosyl. This unique biological role of copper can be rationalized given its chemical and assumed evolutionary background.     

Thermal decomposition of poly(2-vinylpyridine): Effect of complexation with copper chloride

The thermal decomposition of complexes between poly(2-vinylpyridine) (P2VPy) and copper chloride was investigated by several techniques, including thermogravimetric analysis and mass spectrometry. P2VPy was selected as the host polymer for two reasons: its ability to form complexes with copper compounds which are soluble in high concentrations, and because it forms essentially no char upon pyrolysis. The decomposition mechanism of P2VPy changes significantly upon complexation with copper compounds. P2VPy was initially thought to be an ideal ligand for the pyrolytic formation of pure copper owing to its low carbon yield upon thermal decomposition. The presence of copper chloride during polymer decomposition alters the decomposition mechanism of the polymer and accounts for significant yields of carbonaceous char. The magnitude of this effect is dependent upon the quantity of copper present. Polymer char yields as high as 41 wt% have been obtained when each pyridine moiety is complexed by CuCl₂. Studies based on the model compound Cu(2-picoline)₂Cl₂ indicate that the diffusion length of released volatiles plays a significant role in the observed decomposition mechanisms.     

Metals in biology: Electronic structure,properties and charge transfer for copper complexes of glyoxal and dithiene

Summary In an attempt to study the role of metals in biologyab initio SCF calculations have been performed on a model complex simulating the binding between metals and biological materials. There is a certain distinction between the copper complexes compared to the other transition metals and in many cases the copper complexes are more similar to the Li and Be complexes than to other transition metal complexes. One special feature of the copper complexes is their strong ability for an easy transfer between the Cu(I) and Cu(II) states, allowing for a very flexible charge transfer with small energies required for the redox processes. These processes have been described in terms of orbital energies and Mulliken populations.Dedicated to Professor Inga Fischer-Hjalmars on the occasion of her 75th birthday     

Non-steroidal antiinflammatory drug-copper(II) complexes: structure and biological perspectives

Copper(II) complexes with the non-steroidal antiinflammatory drug mefenamic acid in the presence of aqua or nitrogen donor heterocyclic ligands (2,2'-bipyridine, 1,10-phenanthroline, 2,2'-bipyridylamine or pyridine) have been synthesized and characterized. The crystal structures of [(2,2'-bipyridine)bis(mefenamato)copper(II)], 2, [(2,2'-bipyridylamine)bis(mefenamato)copper(II)], 4, and [bis(pyridine)bis(methanol)bis(mefenamato)copper(II)], 5, have been determined by X-ray crystallography. UV study of the interaction of the complexes with calf-thymus DNA (CT DNA) has shown that the complexes can bind to CT DNA and [bis(aqua)tetrakis(mefenamato)dicopper(II)] exhibits the highest binding constant to CT DNA. The cyclic voltammograms of the complexes in the presence of CT DNA solution have shown that the complexes can bind to CT DNA by the intercalative binding mode verified also by DNA solution viscosity measurements. Competitive studies with ethidium bromide (EB) indicate that the complexes can displace the DNA-bound EB suggesting strong competition with EB. Mefenamic acid and its complexes exhibit good binding propensity to human or bovine serum albumin protein having relatively high binding constant values. All the compounds have been tested for their antioxidant and free radical scavenging activity as well as for their in vitro inhibitory activity against soybean lipoxygenase showing significant activity.     

Copper(II) cyclam-based complexes for radiopharmaceutical applications: synthesis and structural analysis

Two molecular structures of the copper(II) complex, Cu(H(2)TETA), have been determined by X-ray crystallography. The Jahn-Teller distortion differs between the two structures; occurring either along the axis of the pendant acetate arms or across the macrocyclic ring. An analysis of deposited data from over one hundred copper(II) cyclam X-ray structures in the Cambridge Structural Database (CSD) reveals that Jahn-Teller distortion across the ring is highly unusual for such compounds in the solid state. Novel chelators based on the piperazino/side-bridged cyclam have been prepared and copper(II) complexes formed. The single crystal X-ray structures of two copper(II) complexes, with either an ester or acid N-pendant arm, have been determined and in both cases the pendant arm is bound to the metal centre.     

Synthesis of N-morpholine or N,N-diethyl, N′-monosubstituted benzoyl thiourea copper complexes: characterization and electrochemical investigations

A series of N-morpholine or N,N-diethyl, N′-substituted benzoyl thioureas (R = Cl, Br, OMe or NO₂ in ortho, meta or para position) have been synthesized by condensation of morpholine or diethylamine with substituted benzoyl isothiocyanates. All CuL₂ complexes have been characterized. Cyclic voltammetry has shown that the irreversible process copper(II)/copper(I) redox systems are influenced slightly by the substitution, whereas the quasi-reversible copper(III)/copper(II) redox systems are not.