间苯二胺水杨醛Schiff碱过渡金属

合成了3种间苯二胺水杨醛Schiff碱过渡金属配合物,其结构经UuVis、IR、元素分析、摩尔电导率测定等表征。荧光光谱表明,3种配合物都能强烈猝灭牛血清白蛋白（BSA）的内源荧光。生物活性实验表明,配合物对金黄色葡萄球菌（S．aureus）、大肠杆菌（Ecoli）、枯草芽孢杆菌（B．subtilis）、绿脓杆菌（P．aeruginosa）均有不同程度的抑茵作用,其中对大肠杆菌的抑茵活性较强。3种配合物的抑菌活性均大于配体的抑茵活性。     

一种双功能的含呋喃和异噁唑环酰腙Cu(Ⅱ)配合物的合成及其性能研究

合成了一种含异噁唑环和呋喃环的新型酰腙的Cu(Ⅱ)配合物,通过红外、紫外光谱和荧光光谱等研究了该配合物的结构及其性质,同时测定了铜配合物对枯草芽孢杆菌、绿脓杆菌、大肠杆菌和金黄色葡萄球菌的抑菌活性。结果表明,铜配合物的水溶液在484 nm处呈现一强蓝色荧光发射峰。铜配合物有较好的抑菌效果,其抑菌活性明显优于配体。该配合物兼有荧光性能和抑菌活性,可应用在材料科学、光动力学疗法等领域。     

N-苯甲酰基-N'-芳基硫脲与铜的配合物的合成及抑菌性研究

以N-苯甲酰基-N'-芳基硫脲和氯化铜为原料,在乙醇中合成了4种未见报道的标题配合物,通过元素分析、红外、紫外及荧光光谱和循环伏安法等对配合物进行了表征,初步确定其组成为[Cu(L)2Cl2]并推测了结构。对金黄色葡萄球菌、枯草芽孢杆菌以及大肠杆菌的抑菌活性测试结果表明,合成的4种配合物均有抑菌活性,且抑菌活性强于相应的配体,其中苯环上为双甲氧基取代的配体及其与铜的配合物对金黄色葡萄球菌的抑制能力强于其他配合物和配体。实验还发现配体的抑菌活性随配体取代基推电子能力呈规律性变化,配体中推电子取代基的数目和推电子能力是影响配合物抑菌活性的主要因素。     

赖氨酸水杨醛Schiff碱Ni(Ⅱ)配合物的合成及表征

采用逐滴反应法合成了一种新的L-赖氨酸水杨醛Schiff碱金属配合物[Ni(Lys-Sal)]。应用电导率测定、元素分析、紫外光谱、红外光谱等表征方法,讨论了配合物的可能组成和结构,并进行抑菌活性的相关探究,结果表明,配合物对金黄色葡萄球菌、大肠杆菌、枯草杆菌及绿脓杆菌的抑菌活性较差。     

N-(2-羟基乙基)-5-溴水杨醛亚胺合铜(Ⅱ)配合物的合成与表征

设计合成了未见文献报道的Ｎ－（２－羟基乙基）－５－溴水杨醛亚胺合铜（Ⅱ）等３种配合物。其组成与结构已由元素分析和红外光谱表征。初步抑菌试验表明３种酚物均有较强的抑菌活性。     

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。     

两种赖氨酸水杨醛Schiff碱稀土金属配合物的合成及表征

采用逐滴反应法合成了两种新型的赖氨酸水杨醛Schiff碱稀土金属配合物[In(Lys-Sal)、Th(Lys-Sal)]。应用电导率测定、元素分析、红外光谱、紫外光谱等方法表征,讨论了配合物的可能组成和结构,并进行抑菌活性的相关探究,结果表明配合物对大肠杆菌、金黄色葡萄球菌、绿脓杆菌及枯草杆菌有较好的抑菌活性。     

席夫碱稀土铈配合物的合成、表征及抗菌活性

利用四乙酰丙酮铈配合物[Ce（acac）4]和Salphen型水杨醛缩邻苯二胺（Schiff碱）合成了双齿Salphen型席夫碱铈金属配合物（SB-Ce）,用红外光谱（FTIR）、紫外-可见光谱（UV-Vis）和差热-热重（TG-DTA）分析进行结构表征,将SB-Ce配合物用于抑菌活性实验。结果表明,SB-Ce对大肠杆菌、枯草杆菌、金黄色葡萄球菌和酵母菌都有一定的抑菌活性,其中对金黄色葡萄球菌的抑菌性最好。     

两种邻氨基苯甲酸缩水杨醛Schiff碱金属配合物的合成及抗菌活性

报道了两种邻氨基苯甲酸缩水杨醛席夫碱金属配合物的合成,并通过红外、紫外、荧光光谱及热分析对其结构和性能进行表征,确定其组成分别为Al(L.2H2O).2H2O和ZnL2,在最大激发波长光源辐射下,测定了它们的荧光性,两种配合物均能发射荧光,峰值(λmax)分别为471和526 nm;初步生物测试结果表明,两种配合物对大肠杆菌、枯草杆菌和金黄色葡萄球菌均有好的抑菌活性,其中ZnL2对大肠杆菌及枯草杆菌的抑菌效果尤为明显。     

苯并咪唑水相合成及其抑菌活性研究

邻苯二胺与3-甲氧基-4-羟基苯甲醛在水中洁净合成了1-（3-甲氧基-4-羟基苄基）-2（3-甲氧基-4-羟基苯基）苯并咪唑。并合成了其Cu（Ⅱ）、Sn（Ⅱ）、Zn（Ⅱ）三个配合物。利用正交法优化了反应条件,较佳条件为反应温度60℃、反应时间2.0 h、胺醛摩尔比0.3。抑菌活性结果表明0.01 g/L浓度的样品对四种菌种均具有较佳的抑菌活性。     

过渡金属组氨酸水杨醛Schiff碱配合物的合成及生物活性

合成了四种组氨酸水杨醛$chiff碱过渡金属配合物[Cu(His-Sal)、Ni(His-sal)、Co(His-Sal)、Mn(His-Sal),His=组氨酸,Sal=水杨醛],其结构经UV、IR,元素分析,摩尔电导分析表征.荧光光谱表明四种配合物都能强烈猝灭BSA的内源荧光.生物活性实验表明配合物对金黄色葡萄球菌...     

对甲氧基肉桂酸乙酯的制备及其抑菌活性测定

采用水蒸气蒸馏法提取沙姜挥发油,然后以溶剂结晶法制得对甲氧基肉桂酸乙酯。通过气-质联用色谱法对其进行了结构鉴定,通过体外抑菌实验,利用纸片法和试管法分别测定了其对金黄色葡萄球菌、大肠杆菌、绿脓杆菌、白色念珠菌和黑曲霉菌的抑菌活性和最低抑菌浓度(M IC)。结果表明,对甲氧基肉桂酸乙酯对这5种常见皮肤致病菌均有良好的抑菌活性,对绿脓杆菌、大肠杆菌、金黄色葡萄球菌、黑曲霉菌和白色念珠菌的最低抑菌浓度分别为0.625,1.25,2.5,2.5和10.0 mg/mL。     

Studies on Some Biologically Cobalt(II), Copper(II) and Zinc(II) Complexes With ONO, NNO and SNO Donor Pyrazinoylhydrazine-Derived Ligands

Biologically active complexes of Co(II), Ni(II), Cu(II) and Zn(II) with novel ONO, NNO and SNO donor pyrazinoylhydrazine-derived compounds have been prepared and characterized on the basis of analytical data and various physicochemical studies. Distorted octahedral structures for all the complexes have been proposed. The synthesized ligands and their complexes have been screened for their antibacterial activity against bacterial species Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus and Klebsiella pneumonae. The activity data show the metal complexes to be more active than the parent free ligands against one or more bacterial species.     

Metal complexes of diisopropylthiourea: synthesis, characterization and antibacterial studies

Co(II), Cu(II), Zn(II) and Fe(III) complexes of diisopropylthiourea have been synthesized and characterized by elemental analyses, molar conductivity, magnetic susceptibility, FTIR and electronic spectroscopy. The compounds are non-electrolytes in solution and spectroscopic data of the complexes are consistent with 4-coordinate geometry for the metal(II) complexes and six coordinate octahedral for Fe(III) complex. The complexes were screened for their antibacterial activities against six bacteria: Escherichia coli, Pseudomonas auriginosa, Klebsiella pneumoniae, Bacillus cereus, Staphylococcus aureus and Bacillus pumilus. The complexes showed varied antibacterial activities and their minimum inhibitory concentrations (MICs) were determined.     

Synthesis and Antibacterial Activities of 1-Alkyl-3-methacryloyl (Acryloyl) of Benzimidazolone (Thione) Derivatives

A series of (28) 1-alkyl-3-methacryloyl (acryloyl)-benzimidazolone (thione) deriv-atives were synthesized. The structures of the new derivatives were confirmed by (1)H-NMR, (13)C-NMR and ESI-MS spectral analysis. The antibacterial activities of these compounds against several strains of bacteria, such as Bacillus cereus, Bacillus subtilis, Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa, were evaluated by methods of paper disc-diffusion and broth mciro-dilution. Methacryloyl derivatives displayed higher antibacterial activities against tested bacterial strains than those of acryloyl derivatives in in vitro tests. A structure-activity relationship (SAR) study revealed that the presences of the methacryloyl moieties is essential to the antibacterial activities of the compounds.     

Characterization and Antimicrobial Activity of Erbium(III) Complexes of C-3 Substituted 2-hydroxy-1,4-naphthalenedione-1-oxime Derivatives

Erbium(III) complexes of 2-hydroxy-l,4-naphthalenedione-1-oxime and its C-3 substituted derivatives are synthesized and characterized by elemental analysis, thermogravimetric analysis, infrared spectroscopy, magnetic susceptibility measurements 2-hydroxy-1,4-naphthalenedione-1-oxime derivatives are analysed using (1)H and (13)C NMR spectroscopy. The molecular composition of the synthesized complexes is found to be [ML(3)(H(2)O)(2)]. The antimicrobial activity of these complexes is determined by well diffusion method against the target microorganisms- Staphylococcus aureus, Xanthomonas campestris, Pseudomonas aeruginosa, Candida albicans and Aspergillus niger. The antimicrobial activities of 2- hydroxy-1,4-naphthalenedione-1-oximes and their complexes are compared. It is observed that 2-hydroxy-1,4-naphthalenedione-l-oximes exhibit higher antifungal activity as compared to antibacterial activity. These activities are reduced upon complexation of these oximes with Erbium.     

Structural and Biological Behaviour of Co(II), Cu(II) and Ni(II) Metal Complexes of Some Amino Acid Derived Schiff-Bases

Biologically active tridentate amino acid (Alanine, Glycine & Tyrosine) derived Schiff-bases and their Co(II), Cu(II) & Ni(II) complexes have been synthesised and characterised on the basis of their conductance and magnetic measurements, elemental analysis and (13)C-NMR, (1)H-NMR, IR and electronic spectral data. These Schiff-bases and their complexes have been evaluated for their antibacterial activity against bacterial species such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumonae, Proteus vulgarus and Pseudomonas aeruginosa and this activity data show the metal complexes to be more antibacterial than the Schiff-bases against one or more bacterial species.     

Synthesis of the Bacteriostatic Poly(l-Lactide) by Using Zinc (II)[(acac)(L)H2O] (L = Aminoacid-Based Chelate Ligands) as an Effective ROP Initiator

The paper presents a synthesis of poly(l-lactide) with bacteriostatic properties. This polymer was obtained by ring-opening polymerization of the lactide initiated by selected low-toxic zinc complexes, Zn[(acac)(L)H₂O], where L represents N-(pyridin-4-ylmethylene) tryptophan or N-(2-pyridin-4-ylethylidene) phenylalanine. These complexes were obtained by reaction of Zn[(acac)₂ H₂O] and Schiff bases, the products of the condensation of amino acids and 4-pyridinecarboxaldehyde. The composition, structure, and geometry of the synthesized complexes were determined by NMR and FTIR spectroscopy, elemental analysis, and molecular modeling. Both complexes showed the geometry of a distorted trigonal bipyramid. The antibacterial and antifungal activities of both complexes were found to be much stronger than those of the primary Schiff bases. The present study showed a higher efficiency of polymerization when initiated by the obtained zinc complexes than when initiated by the zinc(II) acetylacetonate complex. The synthesized polylactide showed antibacterial properties, especially the product obtained by polymerization initiated by a zinc(II) complex with a ligand based on l-phenylalanine. The polylactide showed a particularly strong antimicrobial effect against Pseudomonas aeruginosa, Staphylococcus aureus, and Aspergillus brasiliensis. At the same time, this polymer does not exhibit fibroblast cytotoxicity.     

Antibacterial Co(II), Cu(II), Ni(II) and Zn(II) Complexes of Thiadiazoles Schiff Bases

Schiff bases were obtained by condensation of 2-amino-l,3,4-thiadiazole with 5-substituted-salicylaldehydes which were further used to obtain complexes of the type [M(L)(2)]Cl(2), where M=Co(II), Cu(II), Ni(II) or Zn(II). The new compounds described here have been characterized by physical, spectral and analytical data, and have been screened for antibacterial activity against several bacterial strains such as Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. The antibacterial potency of these Schiff bases increased upon chelation/complexation, against the tested bacterial species, opening new aproaches in the fight against antibiotic resistant strains.