N—取代亚胺二乙酸合铂配合物的合成,表征和反应

1969年,Rosenberg等报道顺式二氯二氨合铂(顺铂)具有抗癌作用,但它有很强的毒副作用和较差的水溶性.1986年,英国正式生产第二代铂抗癌药即碳铂.Khokhar等曾合成一系列N-烷基亚胺二乙酸环己二胺合铂配合物,体外和体内实验均表现出较高的活性和低毒性.其配体以二羧基与铂配位,为八元环结构.显然这不是热力学优势产物.本文合成了一系列二胺铂配合物,结果表明配体以N、O方式与铂配位,具有五元螯合环结构.顺铂与DNA发生交联(主要是与鸟嘌呤N7配位)而抑制癌细胞生长.不同类似物之间的活性差异较大,这可能与它们和DNA作用的动力学有关.我们以鸟苷作模型化合物,用HPLC方法研究了配合物与其作用的动力学,并与顺铂、碳铂进行比较.     

二(2-苯并咪唑亚甲基)胺合铜(II)配合物与DNA作用方式的光谱研究

应用紫外、荧光、黏度等方法, 对二(2-苯并咪唑亚甲基)胺合铜(II)配合物与小牛胸腺DNA作用方式进行了研究. 配合物与DNA作用时, 使紫外吸收明显减色, 荧光降低, 黏度降低; Scatchard图表明配合物对溴化乙锭(EB)与DNA的结合为非竞争性抑制. 实验结果表明, 配合物与DNA作用方式可能为静电结合.     

二(2-苯并咪唑亚甲基)胺合铜(Ⅱ)配合物与DNA作用方式的光谱研究

应用紫外、荧光、黏度等方法，对二(2-苯并咪唑亚甲基)胺合铜(Ⅱ)配合物与小牛胸腺DNA作用方式进行了研究．配合物与DNA作用时，使紫外吸收明显减色，荧光降低，黏度降低；Scatchard图表明配合物对溴化乙锭(EB)与DNA的结合为非竞争性抑制．实验结果表明，配合物与DNA作用方式可能为静电结合。     

含三芳胺基的单环金属铂配合物的合成及其光物理与电化学性质

通过Ullmann反应和环金属化反应合成了两种新型含三芳胺基的单环金属铂配合物: [N,N-二(4-叔丁基苯基)-4-(2'-吡啶基)苯胺-C3, N1](二苯甲酰基甲烷)合铂(Ⅱ)[(BuPhNPPy)Pt(DBM)]和[N,N-二苯基-4-(2'-吡啶基)苯胺-C3, N1](二苯甲酰基甲烷)合铂(Ⅱ) [(PhNPPy)Pt(DBM)], 探讨了分子结构和反应条件对合成反应的影响, 环金属化反应的产率达到87.0%. 研究了单环铂配合物的紫外-可见光谱、光致发光和电化学性质. 研究结果表明, (PhNPPy)Pt(DBM)和(BuPhNPPy)Pt(DBM)的氧化-还原电位分别为0.80, -1.63 V和0.93, -1.45 V; 它们都具有很强的紫外吸收和光致发光性能, 其中(PhNPPy)Pt(DBM)的最大紫外吸收峰为346 nm, 最大荧光波长为537 nm, (BuPhNPPy) Pt(DBM)的最大紫外吸收和荧光波长相应红移7~13 nm.     

水溶性桥联双卟啉与DNA相互作用的研究

以4,4'-二羧酸-2,2'-联吡啶为桥联试剂, 合成了一种含8个阳离子的水溶性桥联双卟啉(PD). 以5,10,15,20-四(4-N-甲基吡啶盐)卟啉(H₂TMPyP)为参照物, 使用紫外-可见光谱、荧光光谱、圆二色谱研究了水溶性双卟啉与小牛胸腺DNA (CT DNA)的相互作用, 以溴化乙啶(EB)竞争法测定了PD与CT DNA的表观键合常数(K_app)为1.2×10⁶ L•mol^－1 (H₂TMPyP为6.9×10⁶ L•mol^－1), 并使用凝胶电泳研究了PD对pBR322质粒DNA的切割能力. 实验结果表明PD与CT DNA的作用方式是插入和外部结合的混合模式.     

桥位二级胺基取代的苝二酰亚胺的合成及其能级结构研究

通过简易的乌尔曼反应, 合成出了一系列桥位二级胺基取代的苝二酰亚胺衍生物2a～2d, 并对其能级结构进行了表征. 紫外-可见光吸收光谱表明, 桥位经过二级胺基取代后苝二酰亚胺的带隙变窄, 最大吸收峰出现了100 nm以上的红移, 从而使吸收范围覆盖到了近红外区. 循环伏安测试表明, 桥位经过二级胺基取代后的苝二酰亚胺同时呈现出可逆的还原峰和氧化峰, HOMO能级大幅上升, 具有双极性半导体特性. 初步探讨了桥位吗啡啉基团取代的苝二酰亚胺2d在有机光伏器件中的应用, 证明其既可以用作电子受体, 也可以用作电子给体.     

受体型有机光伏材料苝二酰亚胺*

苝二酰亚胺作为一种典型的n型材料,具有可见光区强吸收、光和热稳定性较高等突出优点,近年来应用到有机光伏达电池中。本文介绍了苝二酰亚胺及其各种衍生物的结构和性质,综述了其用作有机光伏受体材料（包括小分子型苝二酰亚胺材料、含苝二酰亚胺受体单元的给体-受体双功能分子和含苝二酰亚胺受体单元的给体-受体双缆型聚合物材料）的最新研究进展。     

苯乙烯与N-取代马来酰亚胺的可逆加成-断裂链转移交替共聚合

研究了二硫代苯甲酸酯存在下偶氮二异丁腈引发苯乙烯(St)、St与N-对羟基苯基马来酰亚胺(HPM)、St与N-对(2-氯/溴丙酰氧基)苯基马来酰亚胺(CPPM/BPPM)的可逆加成-断裂链转移(RAFT)均/共聚,聚合物的结构由紫外-可见光(UV-Vis)与凝胶渗透色谱(GPC)表征.结果表明,St的RAFT均聚以及St与N-取代马来酰亚胺的RAFT共聚均呈现活性聚合特征,分子量随着转化率上升而增加,且分子量分布较窄.对于St的RAFT均聚,由于双基终止,聚苯乙烯(PSt)链中"戴帽效率"随着转化率上升逐渐下降.对于St与N-取代马来酰亚胺的RAFT共聚合,电荷转移复合物的形成显著地提高了共聚反应速度,并促进交替结构的形成.随后进行了以P(St-alt-BPPM)引发St的原子转移自由基聚合以制备梳型PSt,结果表明在强极性溶剂中进行的聚合过程失去可控性,所得产物分子量极宽,而在本体聚合中所得聚合物分子量相对较窄,有一定的可控性.     

吲哚马来酰亚胺类化合物的合成及其抗肿瘤活性

为寻找具有抗肿瘤活性的新化合物, 设计合成吲哚马来酰亚胺类化合物, 并评价其体外抗肿瘤活性. 以吲哚与2-氯乙酰胺为起始原料, 经取代、缩合等反应合成了单吲哚马来酰亚胺衍生物5a～5t, 以5-硝基吲哚和不同的N-(3-氯丙基)叔胺经取代、还原、缩合等反应得到了双吲哚马来酰亚胺衍生物9a～9f. 共合成了26个未见文献报道的新化合物, 其结构经质谱、元素分析和核磁共振氢谱确证. 采用MTT法, 测试了目标化合物对肿瘤细胞株HL60, ECA-109, A549, SMMC-7721和PC-3的增殖抑制活性, 结果表明部分化合物对所测肿瘤细胞株均显示一定的抑制作用.     

苝二酰亚胺衍生物/三联吡啶铂配合物超分子在G-四链体检测中的应用

合成了3种三联吡啶铂(Ⅱ)配合物(Pt1、Pt2、Pt3)和两种苝二酰亚胺衍生物(PDI1、PDI2),构建了三联吡啶铂配合物/苝二酰亚胺衍生物超分子体系。所得超分子体系可作为"turn-on"型荧光传感器用于检测c-myc G-四链体。三联吡啶铂配合物可通过电子转移作用猝灭苝二酰亚胺的荧光,利用最小二乘法求得三联吡啶铂配合物与PDIs的结合常数为5.57×104~5.28×106 L/mol。加入G-四链体后,三联吡啶铂配合物/苝二酰亚胺超分子发生解离,苝二酰亚胺衍生物的荧光得到恢复。在Pt2/PDI2体系中加入1.5μmol/L c-myc G-四链体可使其荧光增强63倍。在c-myc的浓度为25nmol/L~1.0μmol/L范围内,Pt2/PDI2超分子体系荧光增强(F/F0)与c-myc的浓度呈良好的线性关系(R2=0.995),检测限为1.37nmol/L,表明Pt2/PDI2超分子体系可用于检测c-myc序列DNA。     

Copper(II) complexes of acylhydrazones: synthesis,characterization and DNA interaction

Two new acylhydrazone copper(II) complexes of 4‐hydroxy‐N′‐[(1E)‐1‐(4‐methylphenyl)ethylidene]benzohydrazide (HL¹) and 4 ethyl [4‐({(2E)‐2‐[1‐(4‐methylphenyl)ethylidene]hydrazinyl}carbonyl)phenoxy]acetate (HL²) have been synthesized and characterized. The structures of both acylhydrazone and copper(II) complexes were identified by elemental analysis, infrared spectra, UV–visible electronic absorption spectra, magnetic susceptibility measurements, TGA and powder X‐ray diffraction. DNA binding and DNA cleavage activities of the synthesized copper complexes were examined by using UV‐visible titration and agarose gel electrophoresis, respectively. The effect of complex concentration on the DNA cleavage reactions in the absence and presence of H₂O₂ was also investigated. The results indicate that all the complexes bind slightly to calf thymus DNA and cleavage pBR322 DNA. The mechanistic studies demonstrate that a hydrogen peroxide‐derived species and singlet oxygen (¹O₂) are the active oxidative species for DNA cleavage. Copyright © 2013 John Wiley & Sons, Ltd.     

Novel water soluble bis(μ‐chloro) bridged Cu(II) binuclear and mononuclear complexes: Synthesis,characterization and biological evaluation

A water soluble chloro bridged binuclear copper(II) complex (3) and mononuclear complex (4) have been synthesized from chloro substituted 2‐oxo‐1,2‐dihydroquinolin‐3‐yl‐methylene‐2 hydroxybenzohydrazide 1 and 2 and CuCl₂·2H₂O. The structures of the complexes have been determined by single crystal X‐ray diffraction. The binding interactions of the ligands and complexes with CT‐DNA and protein have been evaluated by absorption and emission spectroscopic method. CT‐DNA and ethidium bromide (EB) competitive studies revealed that the compounds could interact with CT‐DNA through intercalation binding mode. Interactions of the compounds with BSA were also studied by UV−visible, fluorescence and synchronous fluorescence spectroscopic methods which showed that the compounds had a strong binding affinity with BSA through static quenching process. The cytotoxic effect of the compounds examined on cancer cell lines, such as A549 (lung cancer) and MCF7 (breast cancer) cell lines showed that all four compounds exhibited substantial cytotoxic activity.     

The interaction of a novel ruthenium (II) complex with self‐assembled DNA film on silicon surface

Calf thymus DNA (ct‐DNA) films were immobilized onto patterned silicon wafers through electrostatic self‐assembly technology and interacted with a novel dinuclear ruthenium (II) complex, [(bpy)₂Ru(H₂bpi)Ru(bpy)₂](ClO₄)₄, which were demonstrated by using a confocal optical microscope. The morphology of the DNA film was measured by atomic force microscopy and the results show that the DNA strands have been folded into coiled conformations and aggregated into circles with diameters between 18 and 55 nm. The interaction process was also monitored by UV‐visible and fluorescence spectra and investigated by X‐ray photoelectron spectra. The results show that the Ru (II) complex interacts with ct‐DNA by the intercalative mode as it behaves in aqueous solutions. Copyright © 2006 John Wiley & Sons, Ltd.     

Synthesis,Spectroscopic and Electrochemical Studies of Novel Transition Metal Complexes with Quadridentate Schiff Base

A novel quadridentate, N₂O₂ type Schiff base, synthesized from 1,4‐bis‐(o‐aminophenoxy)butane and 2‐hydroxynaphthalin‐1‐carbaldehyde, forms stable complexes with transition metal ions such as Co(II), Cu(II) and Ni(II) in DMF. Microanalytical data, elemental analysis, magnetic measurements, UV‐visible and IR‐spectra as well as conductance measurements were used to confirm the structures. Electrochemical measurements show that metal complexes undergo quasi‐reversible one‐electron redox processes. The voltammetric results also revealed that the CuL complex has the highest electron transfer rate indicating that both the Cu(II) and Cu(I) forms appear in a similar planar configuration, so the electron transfer does not require larger reorganization of the complex.     

Synthesis,Crystal Structure,Antioxidation and DNA‐Binding Studies of a Zinc(II) Complex with the Bis(N‐allylbenzimidazol‐2‐ylmethyl)aniline

A complex of zinc(II) picrate (pic) with bis(N‐allylbenzimidazol‐2‐ylmethyl)aniline (abba), with composition [Zn(abba)₂](pic)₂, was synthesized and characterized by elemental analysis, electrical conductivity, IR and UV/Vis spectral measurements. The crystal structure of the zinc(II) complex has been determined by single‐crystal X‐ray diffraction. The Zn(II) is bonded to two abba ligands through four benzimidazole nitrogen, resulting in a distorted tetrahedron geometry. The DNA‐binding properties of the ligand and the zinc(II) complex were investigated by electronic absorption, fluorescence spectra and viscosity measurements. The experimental results suggest that the zinc(II) complex binds to DNA in an intercalation mode. In addition, the ligand abba and Zn(II) complex have scavenging effects for hydroxyl radicals and the complex shows stronger scavenging effects for hydroxyl radicals than the ligand.     

四氮大环-金属配合物与DNA作用的电化学及谱学研究

Mononuclear copper（Ⅱ）, nickel（Ⅱ） and cobalt（Ⅲ） tetracoordinate macrocyclic complexes were synthesized and spectroscopically characterized. The crystal structure of the three compounds were determined by X-ray crystallography. The electrochemical experimental results indicate that the three complexes could interact with DNA mainly by electrostatic interaction. The interaction of tetracoordinate macrocyclic cobalt（Ⅲ） complex with DNA was studied by cyclic voltammetry and UV-vis spectroscopy. The experimental results reveal that tetracoordinate macrocyc- lic cobalt（Ⅲ） complex could interact with DNA by electrostatic interaction to form a 1 ： 1 DNA association complex with a binding constant of 7.50 ×10^3 L·mol^-1.     

硫杂蒽酮镍（II）配合物与DNA的作用研究

合成了O-（硫杂蒽酮-[2]-基）-氧乙酸镍（II）配合物。通过元素分析,IR, DTA-TG谱对其结构进行了表征。研究表明：配体羧羰基脱质子后与镍离子配位,配合物中含有一定量的配位水。同时以紫外可见光谱、荧光光谱、园二色谱,电化学方法和凝胶电泳方法研究了该配合物与DNA的作用。结果表明,该配合物能在生理条件下比配体和金属离子更有效地切割质粒DNA,自由基捕捉剂的加入不影响配合物的切割活性。该配合物使DNA溶液的紫外吸收强度和园二色吸收强度降低,DNA的存在可使该配合物的氧化还原活性降低。与溴化乙锭和DNA的竞争反应说明,该配合物主要以嵌入方式与DNA结合。     

Ni(II) Ternary Complex Based on Antimicrobial Drug Enoxacin: Synthesis and Biological Properties

First Ni(II) ternary complex using the quinolone antibacterial agent enoxacin (HEn) as ligand and 1,10‐phenanthroline as co‐ligand has been synthesized and characterized. It is a mononuclear structure, in which enoxacin acts as a bidentate ligand bound to the metal through the ketone oxygen and a carboxylate oxygen atom. The complex exhibited good binding propensity to human and bovine serum albumin proteins having relatively high binding constants (6.40×10⁴ and 7.12×10⁴, respectively). The investigation of the interaction of the complex with calf‐thymus (CT) DNA has been performed with UV and circular dichroism (CD) spectroscopies, indicating that they bind to CT DNA probably by the intercalative binding mode. The binding constant (K_b) of the complex with CT DNA calculated with UV is 2.03×10⁵, which is higher than that of free enoxacin drug (2.09×10⁴) and even higher than that of typical intercalation indicator (1.23×10⁵) of ethidium bromide (EB). Fluorescence competitive studies with EB have revealed that the complex exhibited the ability to displace the DNA‐bound EB using the intercalative binding site. In addition, the antimicrobial activity showed that the complex exhibited a little bit good inhibition (MIC=1.843 (g·mL^?1) against B. subtilis than free HEn.     

Synthesis,characterization and comparative DNA interaction studies of new copper(II) and nickel(II) complexes containing mesalamine drug using molecular modeling and multispectroscopic methods

Complexes of copper(II) and nickel(II) containing the drug mesalamine (5-ASA) have been synthesized and characterized by FT-IR, mass and UV–vis spectra, elemental analysis, and theoretical methods. The binding interactions between mesalamine and its Cu(II) and Ni(II) complexes with calf thymus DNA (ct-DNA) were investigated using absorption, fluorescence emission and circular dichroism (CD) spectroscopies, and viscosity measurements. Absorption spectra of 5-ASA, Cu(II) and Ni(II) complexes showed hypochromism. The calculated binding constants (K_b) obtained from UV–vis absorption studies were 1.27 × 10³, 1.6 × 10³, and 1.2 × 10⁴ M^?1 for 5-ASA, Cu(II) and Ni(II) complexes, respectively. The compounds induced detectable changes in the CD spectra of ct-DNA (B → A structural transition, B → C structural transition and stabilization of the right-handed B form, for mesalamine, Cu(II) and Ni(II) complexes, respectively). The competitive binding experiments with Hoechst 33258 indicated that 5-ASA and copper complex could interact as groove binders. Furthermore, Ni complex had no effect on the fluorescence intensity and peak position of MB-DNA system. Finally, the results obtained from experimental and molecular modeling showed that complexes bind to DNA via minor-groove binding.     

DNA Binding Studies and Cytotoxicity of Ethylenediamine 8‐Hydroxyquinolinato Palladium(II) Chloride

Interaction between ethylenediamine 8‐hydroxyquinolinato palladium(II) chloride and calf thymus DNA (CT‐DNA) in aqueous solution were studied by UV‐Visible absorption, fluorescence spectroscopic techniques and gel chromatography at temperatures of 300 K and 310 K. The complex bound strongly and intercalatively to the CT‐DNA. The results of the cytotoxicity assay of the Pd(II) complex on the leukemia cell line, K562 indicated lower cytotoxicity than cisplatin. The Pd(II) complex is considered an agent with potential antitumor activity. The calculation of several binding and thermodynamic parameters of the inclusion Pd(II) complex with CT‐DNA may provide deeper insights into the mechanism of action of these types of complexes with nucleic acids.