铜(Ⅱ)/铁(Ⅲ)Salen双核配合物的再研究

本文设计了两种不同合成路线，分别制得了相应的铜（Ⅱ）／铁（Ⅲ）Ｓａｌｅｎ双核配合物［Ｓａｌｅｎ代表Ｎ，Ｎ＇－亚乙基双（水杨醛缩亚胺）二价酸根］．通过对这两种产物的元素分析、红外光谱、电子光谱、磁化率及质谱的测定，确定它们属于同一种双核配合物，化学组成为ＣｕＦｅ（Ｓａｌｅｎ）Ｃｌ３·１／２Ｓ（Ｓ＝ＣＨＣｌ３或ＣＨＣｌ２），并对它们的结构进行了讨论．     

对溴苯乙酮缩氨基硫脲配合物的合成表征与抑菌活性

合成了对溴苯乙酮缩氨基硫脲（ＨＬ）与Ｎｉ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｏ（Ⅲ）的配合物，通过元素分析、红外光谱、磁矩、摩尔电导等表征了配合物．测试了配合物、配体及盐的抑菌活性．     

17电子钒开环夹心羰基配合物的合成及XRD,IR,EPR研究

以４种甲基取代戊二烯基为配体合成了４个过渡金属钒开环夹心羰基配合物［２，４－（ＣＨ３）２Ｃ５Ｈ５］２ＶＣＯ（Ｉ），［２，３－（ＣＨ３）２Ｃ５Ｈ５］ＶＣＯ（Ⅱ），［２－ＣＨ３Ｃ５Ｈ６］２ＶＣＯ（Ⅲ）和［３－ＣＨ３Ｃ５Ｈ６］２ＶＣＯ（Ⅳ），其中Ⅱ，Ⅲ，Ⅳ为新配合物，用Ｘ射线单晶衍射，ＩＲ，ＥＰＲ法对所合成配合物进行了结构表征，发现Ｉ具有两种晶相。     

Cu（Ⅱ）－Ln（Ⅲ）双核配合物的合成、磁性和抗菌活性

合成和表征了６种以草酰胺为桥联的异双核配合物Ｃｕ（ｏｘｅｎ）Ｌｎ（ｐｈｅｎ）２（ＣｌＯ４）３（ｏｘｅｎ代表Ｎ，Ｎ′－双（２－氨乙基）草酰胺根阴离子；ｐｈｅｎ为１，１０－邻菲咯琳；Ｌｎ表示Ｙ、Ｌａ、Ｃｅ、Ｎｄ、Ｇｄ和Ｙｂ）．测定了Ｃｕ（ｏｘｅｎ）Ｇｄ（ｐｈｅｎ）２（ＣｌＯ４）３·Ｈ２Ｏ的变温磁化率（４～３００Ｋ）；井用最小二乘法和从自旋Ｈａｍｉｌｔｏｎｉａｎ算符导出的磁方程拟合，求得交换积分Ｊ＝２．３ｃｍ－１；表明配合物中Ｃｕ（Ⅱ）和Ｇｄ（Ⅲ）离子间存在弱的铁磁性超交换作用。测试了配合物的抗菌活性。     

3—硝基邻苯二甲酸根桥联双核钴（Ⅱ）配合物的合成,磁性及抗癌活性

合成了两种以３－硝基邻苯二甲酸根为桥联配体的新型双核钴（Ⅱ）的配合物，即「ｏ２（３ＰＴ）（Ｐｈｅｎ）４」。（ＣｌＯ４）２．４Ｈ２Ｏ（配合物１）帮「Ｃｏ２（３ＰＴ）ＮＰｈｅｎ）４」（ＣｌＯ４）Ｄ２．５Ｈ２Ｏ（配合物２）。发现该两配合均具有较强的抑制人白血病细胞的活性。     

碘冉酸阴离子桥联双核铜（Ⅱ）配合物的合成与磁性

碘冉酸阴离子桥联双核铜（Ⅱ）配合物的合成与磁性孟祥军寇会忠邹国彰廖代正姜宗慧＊王耕霖（南开大学化学系天津３０００７１）关键词碘冉酸，Ｃｕ（Ⅱ），双核配合物，合成，磁性１９９６－０８－２０收稿，１９９６－１１－１８修回国家自然科学基金资助项目随着生物无...     

双安息香缩三乙四胺双核过渡金属配合物的合成,表征与载…

合成了双安息香缩三乙四胺及其与草酸共同配位的Ｃｏ（Ⅱ），Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）的三元双核金属配合物。经经质谱、红外光谱等方法表征。用气体吸收装置探讨了配合物在ＤＭＦ溶剂中的载氧性质和载氧动力学。     

过渡金属L丙氨酸席夫碱配合物的合成及其抗O_2~(.-)性能

合成了Ｌ－丙氨酸缩邻香草醛席夫碱及其过渡金属Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）和Ｆｅ（Ⅲ）等的配合物．通过元素分析、摩尔电导、红外光谱、电子光谱、热分析及顺磁共振波谱等手段对它们进行了表征，并探讨了它们对Ｏ·－２的清除作用     

N—亚水杨基氨基酸3d金属配合物的合成,表征和抑菌活性

合成了丙氨酸、亮氨酸水杨醛席夫碱及其与Ｍｎ（Ⅱ）、ＣＯ（Ⅱ）、Ｎｉ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｕ（Ⅱ）的配合物，通过元素分析、摩尔电导、磁化率、红餐光谱和电子光谱等进行了睛征，用ＰＨ法测定了配合物稳定常数，实验发现，配合物抑菌活性优于配体抑菌活性。     

N－亚水杨基氨基酸3d金属配合物的合成、表征和抑菌活性

合成了丙氨酸、亮氨酸水杨醛席夫碱及其与Ｍｎ（Ⅱ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｕ（Ⅱ）的配合物。通过元素分析、摩尔电导、磁化率、红外光谱和电子光谱等进行了表征。用ｐＨ法测定了配合物稳定常数。实验发现，配合物抑菌活性优于配体抑菌活性。     

大环多胺及其金属配合物与DNA的相互作用*

本文综述了近年来基于大环多胺及其金属配合物与DNA相互作用的研究进展,着重介绍本课题组在有关单双核、多核以及功能化大环多胺衍生物及其金属配合物与DNA相互作用方面的研究和发现,并对其在化学核酸酶方面的应用进行了讨论。在单双核大环多胺衍生物方面,我们分别合成了以吡啶、苯环、咪唑、三氮唑为侧臂的单核大环多胺金属配合物,同时合成了以刚性桥相连的双核配合物和以柔性链相连的双核配合物。并研究这些单双核大环多胺与DNA的相互作用,发现以刚性链相连的双核大环多胺金属配合物具有很好的切割DNA的性质,可以在低浓度、短时间内切断DNA。在功能化大环多胺方面,我们合成了含有碱基、PNA单体、咪唑鎓盐、冠醚、二茂铁等功能化基团的大环多胺衍生物及金属配合物,并研究了其与DNA的相互作用。在多核大环多胺方面,我们合成了基于大环多胺的寡聚物,研究发现该类物质可与DNA形成复合物,从而有效地保护DNA免于酶解。     

Electrochemically-driven conformational shift in mono- and di-copper constrained macrotricyclic cyclen receptors

An electrochemical study of mono- and di-copper constrained cyclen macrotricycles is presented. Electrochemical data in DMF solution indicate that the reduction of dinuclear complexes occurs in two steps in the -0.4 to -0.8 V vs.AgCl/Ag potential range yielding CuII CuI and CuI CuI species further reduced to Cu metal at highly negative potentials. Mononuclear complexes are reduced in two steps to CuI and Cu metal. Electrochemical data suggest that reduction of both mononuclear and dinuclear complexes approach a square scheme involving electrochemically-driven conformational shifts for metal ions. The presence of endo- and exo-forms of the complexes are revealed by changes in the electrochemical response of the complexes in the presence of tetraethylammonium chloride, 1-azabicyclo[2.2.2]octane and diazabicyclo[2.2.2]octane competing ligands.     

Ni(II), Cu(II), and Zn(II) dinuclear metal complexes with an aza-phenolic ligand: crystal structures,magnetic properties,and solution studies

The basicity behavior and ligational properties of the ligand 2-((bis(aminoethyl)amino)methyl)phenol (L) toward Ni(II), Cu(II), and Zn(II) ions were studied by means of potentiometric measurements in aqueous solution (298.1 +/- 0.1 K, l = 0.15 mol dm-3). The anionic L-H- species can be obtained in strong alkaline solution; this species behaves as tetraprotic base (log K1 = 11.06, log K2 = 9.85, log K3 = 8.46, log K4 = 2.38). L forms mono- and dinuclear complexes in aqueous solution with all the transition metal ions examined; the dinuclear species show a [M2(L-H)2]2+ stoichiometry in which the ligand/metal ratio is 2:2. The studies revealed that two mononuclear [ML-H]+ species self-assemble, giving the dinuclear complexes, which can be easily isolated from the aqueous solution due to their low solubility. This behavior is ascribed to the fact that L does not fulfill the coordination requirement of the ion in the mononuclear species and to the capacity of the phenolic oxygen, as phenolate, to bridge two metal ions. All three dinuclear species were characterized by determining their crystal structures, which showed similar coordination patterns, where all the single metal ions are substantially coordinated by three amine functions and two oxygen atoms of the phenolate moieties. The two metals in the dinuclear complexes are at short distance interacting together as shown by magnetic measurements performed with Ni(II) and Cu(II) complexes, which revealed an antiferromagnetic coupling between the two metal ions. The [Cu2(L-H)2]2+ cation shows a phase transition occurring by the temperature between 100 and 90 K; the characterization of the compounds existing at different temperatures was investigated using X-ray single-crystal diffraction, EPR, and magnetic measurements.     

Selective recognition of HIV RNA by dinuclear metallic ligands

We describe the development of dinuclear metallic ligands to target specific HIV RNA structures. Two series of dipyridinyl-N bridged dinuclear metal complexes were synthesized and their binding activities toward TAR and RRE RNA were studied both experimentally and theoretically.     

Highly efficient phosphodiester hydrolysis promoted by a dinuclear copper(II) complex

The interaction of Cu(II) with the ligand tdci (1,3,5-trideoxy-1,3,5-tris(dimethylamino)-cis-inositol) was studied both in the solid state and in solution. The complexes that were formed were also tested for phosphoesterase activity. The pentanuclear complex [Cu(5)(tdciH(-2))(tdci)(2)(OH)(2)(NO(3))(2)](NO(3))(4).6H(2)O consists of two dinuclear units and one trinuclear unit, having two shared copper(II) ions. The metal centers within the pentanuclear structure have three distinct coordination environments. All five copper(II) ions are linked by hydroxo/alkoxo bridges forming a Cu(5)O(6) cage. The Cu-Cu separations of the bridged centers are between 2.916 and 3.782 A, while those of the nonbridged metal ions are 5.455-5.712 A. The solution equilibria in the Cu(II)-tdci system proved to be extremely complicated. Depending on the pH and metal-to-ligand ratio, several differently deprotonated mono-, di-, and trinuclear complexes are formed. Their presence in solution was supported by mass, CW, and pulse EPR spectroscopic study, too. In these complexes, the metal ions are presumed to occupy tridentate [O(ax),N(eq),O(ax)] coordination sites and the O-donors of tdci may serve as bridging units between two metal ions. Additionally, deprotonation of the metal-bound water molecules may occur. The dinuclear Cu(2)LH(-3) species, formed around pH 8.5, provides outstanding rate acceleration for the hydrolysis of the activated phosphodiester bis(4-nitrophenyl)phosphate (BNPP). The second-order rate constant of BNPP hydrolysis promoted by the dinuclear complex (T = 298 K) is 0.95 M(-1) s(-1), which is ca. 47600-fold higher than that of the hydroxide ion catalyzed hydrolysis (k(OH)). Its activity is selective for the phosphodiester, and the hydrolysis was proved to be catalytic. The proposed bifunctional mechanism of the hydrolysis includes double Lewis acid activation and intramolecular nucleophilic catalysis.     

DNA cleavage by the photocontrolled cooperation of Zn(II) centers in an azobenzene-linked dizinc complex

We synthesized a new photoactive dinuclear zinc(II) complex by linking two zinc centers with a ligand containing an azobenzene chromophore and investigated the DNA cleavage activities of its trans and cis forms. The trans structure of the dinuclear zinc complex was determined by X-ray crystallography, where each zinc center is situated in an octahedral coordination environment comprised of three nitrogen atoms from the ligand and three oxygen atoms from two nitrate ions. The dinuclear zinc complex containing the azobenzene chromophore was photoisomerizable between the trans and cis forms. The binding affinities of the trans and cis complexes with calf thymus (CT)-DNA were similar. Although the DNA cleavage activity of the trans complex was negligible, the cis complex was able to cleave DNA. We attribute the efficient activity of the cis complex to the cooperation of the two closely located zinc centers and the inactivity of the trans complex to the two metal centers positioned far away from each other. The DNA cleavage activity of the cis complex exhibited a pH-dependent bell-shaped profile, which has been observed in the hydrolytic cleavage of DNA by zinc complexes. The DNA cleavage activity was not inhibited by a major groove binder, methyl green, but decreased significantly by a minor groove binder, 4',6-diamidino-2-phenylindole, indicating that the dinuclear zinc complex binds to the minor groove of DNA. The present work shows the importance of the cooperation of two zinc ions for hydrolytic DNA cleavage, which can be photoregulated by linking the two metal centers with a photoisomerizable spacer, such as an azobenzene chromophore.     

Dinuclear complexes of a pseudocalixarene macrocycle: structural consequences of intramolecular hydrogen bonding

A series of dinuclear complexes of a pseudocalixarene macrocycle H6L containing two 2,2'-methylenediphenol groups have been synthesised and structurally characterised. Using divalent metal ions, complexes containing a common hyperbolic paraboloid (saddle) M2(H4L)2+ core are formed. The structure is controlled by two strong O-H-O interactions resulting from metal ion-promoted monodeprotonation of the methylenediphenol units. The metal ions are located in a cleft within which neutral or anionic guests can bind. Use of trivalent metal ions leads to complete deprotonation of the phenol groups and loss of the saddle conformation.     

Versatile host for metallo anions and cations

The crystal structures of two metallo oxides, perrhenate and dichromate, are reported with a diprotonated tetraamido/diamino-based macrocycle, L, in which the floppy ligand assumes a folded conformation. When the four amides are deprotonated, this same ligand binds transition-metal ions in its tetraanionic form, H-4L. For the divalent metal ions Cu2+ and Ni2+, H-4L again folds and dinuclear complexes are formed. With trivalent metal ions Co3+ and Fe3+, the ligand wraps about the metal ions, resulting in mononuclear complexes.     

磁场对Schiff碱配合物模拟甲烷单加氧酶催化性能的影响

生命体中存在许多双金属酶 ,其结构和作用机制目前尚不清楚 ,为了模拟甲烷单加氧酶的催化作用 ,我们将催化活性较高的金属卟啉、稳定性较高的 Schiff碱及双核结构结合起来 ,设计合成了一系列“类卟啉型”Schiff碱双核配合物 ,并将这些双核配合物模拟酶催化亚碘酰苯 (Ph IO)单加氧化环己烷反应 ,发现其催化活性及抗氧化稳定性类似于四芳基金属卟啉 [1～ 3 ] ;还发现在模拟酶催化环己烷氧化反应中双核配合物中的两个金属离子间存在协同作用 [4 ] .外加磁场对一般热化学反应影响较小 [5～ 7] ,而在催化反应中的磁场效应更明显 [5,8] .为了较…     

Structural, MALDI-TOF-MS, magnetic and spectroscopic studies of new dinuclear copper(II), cobalt(II) and zinc(II) complexes containing a biomimicking μ-OH bridge

The Py(2)N(4)S(2) octadentate coordinating ligand afforded dinuclear cobalt, copper and zinc complexes and the corresponding mixed metal compounds. The overall geometry and bonding modes have been deduced on the basis of elemental analysis data, MALDI-TOF-MS, IR, UV-vis and EPR spectroscopies, single-crystal X-Ray diffraction, conductivity and magnetic susceptibility measurements. In the copper and zinc complexes, a μ-hydroxo bridge links the two metal ions. In both cases, the coordination geometry is distorted octahedral. Magnetic and EPR data reveal weakly antiferromagnetic high spin Co(II) ions, compatible with a dinuclear structure. The magnetic characterization of the dinuclear Cu(II) compound indicates a ferromagnetically coupled dimer with weak antiferromagnetic intermolecular interactions. The intra-dimer ferromagnetic behaviour was unexpected for a Cu(II) dimer with such μ-hydroxo bridging topology. We discuss the influence on the magnetic properties of non-covalent interactions between the bridging moiety and the lattice free water molecules.