水杨醛缩对硝基苯胺钴配合物的合成、表征及荧光性质研究

以水杨醛和对硝基苯胺为原料合成了Schiff碱水杨醛缩对硝基苯胺,将其与Co(Ⅱ)作用合成水杨醛缩对硝基苯胺钴配合物。通过红外光谱分析、元素分析、热重分析等方法对产物结构进行表征。并通过荧光光谱对配体、配合物荧光发光性质进行了研究。结果表明,配体水杨醛缩对硝基苯胺及其Co(Ⅱ)配合物CoL_2·5H_2O均有发光性能。     

分子筛固载西佛碱和四氢西佛碱铜配合物的合成和表征

合成了三种西佛碱H₂L(H₂L₁=双水杨醛缩丙二胺,H₂L2=双水杨醛缩环己二胺,H₂L₃=双水杨醛缩乙二胺)及相应的四氢西佛碱配体H₂［H₄］L,并与醋酸铜反应合成其铜配合物。采用自由配体法将金属铜配合物封装在Y型分子筛的超笼里,同时利用红外手段对其进行了表征。证明在环己烷氧化反应中Cu［H₄］-Y比CuL-Y具有更高的反应活性。     

水杨醛缩对氯苯胺合铜的合成与发光性能

设计合成了席夫碱配体水杨醛缩对氯苯胺（HL）及其铜配合物（CuL2）,由元素分析、摩尔电导率、红外光谱推测出配合物组成为CuL2。对比研究了水杨醛缩对氯苯胺和水杨醛缩对氯苯胺合铜在甲醇、无水乙醇、丙酮溶液中的荧光性质,由荧光光谱分析可以看出,配体与配合物能够发射较强的荧光,配合物CuL2的发光机理为配体的π＊→n发光。     

双水杨醛缩邻苯二胺-Ce（Ⅲ）配合物的生物活性研究

合成了一种salen稀土金属双水杨醛缩邻苯二胺ce（Ⅲ）配合物,其结构用紫外光谱、红外光谱、核磁共振及电喷雾质谱进行表征。用纸片法测定配合物对大肠杆菌和枯草杆菌的抗菌活性,表明配合物对大肠杆菌有较好的抗菌活性。用紫外光谱和荧光光谱研究配合物与小牛胸腺DNA（ctDNA）的相互作用,初步表明配合物与DNA之间很可能是嵌入作用、静电作用的方式并存,并且配合物还可作为DNA的荧光染料。     

Salen铈（Ⅲ）配合物与DNA相互作用方式的研究

合成双水杨醛缩邻苯二胺-Ce（Ⅲ）配合物,用红外光谱、核磁共振谱以及电喷雾质谱法对其结构进行表征,并用荧光光谱法、电子吸收光谱法研究了铈（Ⅲ）配合物与DNA的相互作用方式,实验研究表明配合物与DNA之间很可能是嵌入作用和部分嵌入作用并存。     

3,5-二溴水杨醛缩乙醇胺席夫碱铜(Ⅱ)配合物的制备及其仿酶催化活性研究

利用溶液法,设计合成了3,5-二溴水杨醛缩乙醇胺席夫碱及其铜(Ⅱ)配合物,通过紫外光谱﹑红外光谱﹑热重分析等技术对目标产物的结构进行了表征和确认.以催化活性为指标,考察了3,5-二溴水杨醛缩乙醇胺、3,5-二溴水杨醛缩氨基甲磺酸、3,5-二溴水杨醛缩牛磺酸3种席夫碱的铜(Ⅱ)配合物催化过氧化氢氧化抗坏血酸的反应,结果表明3种席夫碱铜(Ⅱ)配合物均具有辣根过氧化物酶(HRP)的催化功能,催化效果为乙醇胺席夫碱铜(Ⅱ)配合物＞氨基甲磺酸席夫碱铜(Ⅱ)配合物＞牛磺酸席夫碱铜(Ⅱ)配合物.研究了乙醇胺席夫碱铜(Ⅱ)配合物催化过氧化氢氧化抗坏血酸的反应动力学,并初步探讨了催化反应机理.     

2-（4-咪唑基苯乙烯基）-8-羟基喹啉锌的合成与光致发光特性

合成了一种新型的2-（4-咪唑基苯乙烯基）-8-羟基喹啉配体以及其金属锌配合物,用红外光谱（IR）、紫外光谱（UV）、元素分析（EA）、核磁共振氢谱（1H NMR）等确认了化合物的结构,通过荧光光谱测定了配合物的荧光性质,证实其具有良好的光致发光性能,最大发射波长为576 nm;热重分析实验也表明了金属锌配合物有很好的热稳定性。     

含［N,O］配体的镍配合物/烷基铝催化甲基丙烯酸甲酯的聚合

制备了两种镍配合物二［N-(2-氧基-1-萘甲醛)缩-2,6-二异丙基苯胺］合镍［Ni(L₁)₂］和二［N-(2-氧基-1-萘甲醛)缩-邻甲基苯胺］合镍［Ni(L₂)₂］。研究了它们以普通烷基铝为助催化剂催化甲基丙烯酸甲酯(MMA)的聚合。结果表明,镍配合物的结构、聚合条件如单体浓度、Al与Ni物质的量比、聚合温度和聚合时间等对甲基丙烯酸甲酯聚合反应活性有很大的影响，当甲基丙烯酸甲酯浓度为0.8 mol·L^-1、n(Al)∶n(Ni)=400、温度为0 ℃时,催化活性达到110.7 kg-PMMA·(mol-Ni·h)^-1。随着聚合时间的延长，催化活性下降，而转化率则随着聚合时间的延长而缓慢增加。     

（氧二亚甲基）双苯并咪唑及其配合物的合成与荧光性质

合成了2,2’-（氧二亚甲基）双苯并咪唑及其Ni（Ⅱ）和La（Ⅲ）的配合物,采用元素分析、红外光谱、紫外光谱和摩尔电导率等进行表征,研究了它们的固体荧光性质,发现它们都是良好的荧光物质。     

水杨醛缩芳香胺席佛碱稀土配合物的合成及其光谱性质

合成了一系列水杨醛缩芳香胺席佛碱稀土配合物,研究了它们的红外光谱、紫外可见光谱及荧光光谱性质。与配体相比,配合物的红外特征键C=N吸收波数有减小趋势,紫外光谱中出现新的长波长吸收带,荧光光谱为属离子微扰配体发光。     

呋喃胺水杨醛Schiff碱镍(Ⅱ)配合物的合成与结构表征

以4,5-二甲基-3-腈基-2-呋喃胺与水杨醛为原料,合成了4,5-二甲基-3-腈基-2-呋喃胺水杨醛Schiff碱化合物,再与氯化镍反应得到一种新型的呋喃胺水杨醛Schiff碱镍(Ⅱ)配合物.通过IR、UV、元素分析及摩尔电导率等对目标化合物进行了表征,应用荧光光谱法研究了该配合物与牛血清白蛋白(BSA)在不同温度下...     

The ring‐opening polymerization of D,L‐lactide catalyzed by new complexes of Cu,Zn, Co,and Ni Schiff base derived from salicylidene and L‐aspartic acid

D ,L ‐lactide (LA) was first successfully ring‐opening polymerized in melt by Schiff base complexes K[ML]nH₂O [M = Cu(II), Zn(II), Co(II), Ni(II); n = 2, 2, 3, 3.5; H₃L = L‐aspartic acid‐salicylidene Schiff base], which were prepared by Schiff base ligand derived from salicylidene and L‐aspartic acid and corresponding acetates. The effects of various complexes, the molar ratio of K[ML]nH₂O/LA, the polymerization temperature, and time were studied in detail. The results show that all complexes studied have the ability to initiate the ring‐opening polymerization of D ,L ‐lactide in melt. More than 90% high polymerization conversion and narrow molecular weight distribution (MWD) can be obtained very easily. However, the Ni(II) complex shows better catalytic property than other complexes on the polymerization and the molecular weight (MW) of poly(D ,L ‐lactide) (PLA) produced. With a rise in temperature and a prolongation of time, the MW of PLA decreased remarkably. The MW of PLA prepared by all complexes is not very high, which might be related to the crystalline water of complexes. X‐ray study indicated that PLA produced by Ni(II) complex is an amorphous polymer. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 3312–3315, 2002     

Structural evidence of a ketimine as the product of an amino acid with an aldehyde. An intermediate in the racemization and transamination of amino acids

The aldimine and ketimine forms of two Schiff base complexes formed by the condensation of two isomeric imidazole carboxaldehydes with an amino acid are reported. Reaction of L¹, the Schiff base condensate of 5-methyl-4-imidazolecarboxaldehyde (5Me4Im) and valine, with copper(II) perchlorate results in the isolation of [Cu(L¹)(5Me4Im)(ClO₄)] while the analogous reaction of L², the Schiff base condensate of 1-methyl-2-imidazolecarboxaldehyde (1Me2Im) with alanine, and nickel(II) results in the isolation of [Ni(L²)₂]. L¹ exhibits the expected aldimine form of the amino acid derived Schiff base, 5Me4Im-CH = N-CH(R)CO₂⁻, while L² exhibits the tautomeric ketimine form, 1Me2Im-CH₂–N = C(R’)CO₂⁻. Structural data clearly support the two tautomeric forms. The ketimine form, observed in [Ni(L²)₂], has been proposed as an intermediate in the racemization and transamination of amino acids.     

Antimicrobial Polychelates: Synthesis and Characterization of Transition Metal Chelated Barbituric Acid–Formaldehyde Resin

A monomeric Schiff base was prepared by the condensation reaction of salicylaldehyde and semicarbazide, which further react with formaldehyde and barbituric acid-formed polymeric Schiff base. Its metal polychelates were then formed with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II). All the synthesized compounds were characterized by elemental analysis, magnetic moment, FTIR, ¹HNMR, and electronic spectroscopies. The elemental analysis data show the formation of 1:1 [M: L] metal polychelates. Thermogravimetric analysis was carried out to find the thermal behavior of all the synthesized polymeric compounds and thermal data revealed that all the metal polychelates are more thermally stable than their parent polymeric Schiff base. All the synthesized polymeric compounds were screened for antimicrobial activity against some clinically important microorganisms, such as Escherichia coli, Pseudomonas aeruginosa, Bacillus subtilis, Staphylococcus aureus, Staphylococcus typhi, Candida albicans, Microsporum canis, and Aspergillus niger. In vitro antimicrobial activity was determined by the Agar Well Diffusion method and the result shows that all the metal polychelates exhibited better antimicrobial activity than their parent polymeric Schiff base.     

水杨醛缩胺类双席夫碱过渡金属配合物的合成与表征

以水杨醛与乙二胺为原料,通过席夫碱反应合成一类水杨醛缩胺类双席夫碱,并进一步与铜、锌、镍3种金属离子络合得到3种过渡金属配合物;采用元素分析、红外光谱和紫外光谱对席夫碱及其金属配合物的结构进行表征.结果表明,合成的水杨醛缩乙二胺配体分子结构与理论结构相符,且分别与铜、锌、镍离子络合形成了稳定的过渡金属配合物.     

Synthesis and Fluorescent Properties of Zn(II) Complex with Functionalized Polystyrene Containing Salicylaldehyde End Group

Summary Fuctionalized polystyrene ligand containing schiff base end group (N-Salicyliden-(4-methoxy-Anilin)) was obtained by condensation of p-methoxyanilin with polystyrene containing salicylaldehyde end group which was prepared through atom transfer radical polymerization (ATRP). The polystyrene ligand was applied to prepare Zn(II) complex. The polystyrene ligand and its complex were characterized through ¹H-NMR, IR, UV-Vis and fluorescent spectra. Compared with analogous Zn(II) complexs with small molecular schiff base, the complex was soluble in common solvents, easy to form film and showed intensive fluorescence. When excited at 330 nm, the complex emitted intense fluorescence at 500 nm. The effects of different molecular weights, amount of solvent in coordination reaction and reaction methods including conventional heating and microwave irradiation on Zn contents and fluorescent intensity were also discussed.     

New polymeric Schiff base and its metal complexes

A novel polymeric Schiff base was synthesized by the reaction of a Schiff base from 2,4‐dihydroxy benzaldehyde and aniline with acryloyl chloride and was polymerized in methyl ethyl ketone at 70°C with benzoyl peroxide as a free‐radical initiator. Polychelates were obtained in an alkaline solution of poly(2‐hydroxy‐4‐acryloyloxy‐N‐phenylbenzylidine) with aqueous solutions of metal ions such as Cu(II), Ni(II), Co(II), Ca(II), Cd(II), Mn(II), and Zn(II). The polymeric Schiff base and polychelates were characterized with elemental analysis and spectral studies. The elemental analysis of the polychelates suggested that the metal‐to‐ligand ratio was 1:2. The IR spectral data of the polychelates indicated that the metals were coordinated through the nitrogen and oxygen of the phenolic ? OH group. Diffuse reflectance spectra, electron paramagnetic resonance, and magnetic moment studies revealed that the polychelates of the Cu(II) complex were square‐planar, those of the Ni(II), Mn(II), and Co(II) complexes were octahedral, and those of the Ca(II), Cd(II), and Zn(II) complexes were tetrahedral. X‐ray diffraction studies revealed that the polychelates were highly crystalline. The thermal properties of the Schiff base and polychelates were also examined. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 494–500, 2004     

Synthesis,characterization, and thermal and antimicrobial studies of newly developed transition metal–polychelates derived from polymeric Schiff base

Monomeric Schiff base derived from salicylaldehyde and 1,3‐diaminopropane was subjected to polycondensation reaction with formaldehyde and piperazine in basic medium. The resin was found to form polychelates readily with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) metal ions. The materials were characterized by elemental analysis, spectral studies (IR, ¹H‐NMR, ¹³C‐NMR, and UV–visible), magnetic moment measurements, and thermal analysis. The electronic spectra and magnetic moment measurements of the synthesized polychelates confirmed the geometry of the central metal ion. Metal–resin bonds were registered in the IR spectra of the polychelates. The thermogravimetric analysis data indicated that the polychelates were more stable than the corresponding polymeric Schiff base. All the synthesized metal–polychelates showed excellent antibacterial activities against the selected bacteria. The antimicrobial activities were determined by using the shaking flask method, where 25 mg/mL concentrations of each compound were tested against 10⁵ CFU/mL bacteria solutions. The number of viable bacteria was calculated by using the spread‐plate method, where 100 μL of the incubated antimicrobial agent in bacteria solutions were spread on agar plates, and the number of bacteria was counted after 24 h of incubation period at 37°C. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Polystyrene anchored vanillin Schiff base—Complexation and ion removal studies

A set of six new polystyrene anchored metal complexes have been synthesized by the reaction of the metal salt with the polystyrene anchored Schiff base of vanillin. These complexes were characterized by elemental analyses, Fourier transform infrared spectroscopy, diffuse reflectance studies, thermal studies, and magnetic susceptibility measurements. The elemental analyses suggest a metal : ligand ratio of 1 : 2. The ligand is unidentate and coordinates through the azomethine nitrogen. The Mn(II), Fe(III), Co(II), Ni(II), and Cu(II) complexes are all paramagnetic while Zn(II) is diamagnetic. The Cu(II) complex is assigned a square planar structure, while Zn(II) is assigned a tetrahedral structure and Mn(II), Fe(III), Co(II), and Ni(II) are all assigned octahedral geometry. The thermal analyses were done on the ligand and its complexes to reveal their stability. Further, the application of the Schiff base as a chelating resin in ion removal studies was investigated. The polystyrene anchored Schiff base gave 96% efficiency in the removal of Ni(II) from a 20‐ppm solution in 15 min, without any interference from ions such as Mn(II), Co(II), Fe(III), Cu(II), Zn(II), U(VI), Na⁺, K⁺, NH₄⁺, Ca²⁺, Cl^?, Br^?, NO₃^?, NO₂^?,and CH₃CO₂^?. The major advantage is that the removal is achieved without altering the pH. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1536–1539, 2005     

New antimicrobial agents: The synthesis of Schiff base polymers containing transition metals and their characterization and applications

A new polymeric Schiff base containing formaldehyde and 2‐thiobarbituric acid moieties was synthesized by the condensation of a monomeric Schiff base derived from 2‐hydroxyacetophenone and hydrazine. Polymer–metal complexes were also synthesized by the reaction of the polymeric Schiff base with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) acetate. The polymeric Schiff base and its polymer–metal complexes were characterized with magnetic moment measurements, elemental analyses, and spectral techniques (infrared, ¹H‐NMR, and ultraviolet–visible). The thermal behaviors of these coordination polymers were studied by thermogravimetric analysis in a nitrogen atmosphere up to 800°C. The thermal data revealed that all of the polymer–metal complexes showed higher thermal stabilities than the polymeric Schiff base and also ascribed that the Cu(II) polymer–metal complex showed better heat resistant properties than the other polymer–metal complexes. The antimicrobial activity was screened with the agar well diffusion method against various selected microorganisms, and all of the polymer–metal complexes showed good antimicrobial activity. Among all of the complexes, the antimicrobial activity of the Cu(II) polymer–metal complex showed the highest zone of inhibition because of its higher stability constant and may be used in biomedical applications. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011