Syntheses, Crystal Structures and Kinetic Mechanisms of Thermal Decomposition of Rare Earth Complexes with Schiff Base Derived from o-Vanillin and p-Toluidine

Withtheincreasingapplicationofrareearthmet alsinavarietyoffields,rareearthionscontinuallyin trudeintogeneralenvironmentandfurtherintothe bodiesofplants,animalsandhumanbeings.Itis thereforeofsignificancetoinvestigatethephysiological actionandlong termeffectofrareearthiononbiologi calbodies.VariousstudieshaveshownthatSchiff basesderivedfromsalicylaldehydeanditsderivatives haveconsiderablebiologicalimportancepartlybecause suchligandshavemanydonoratoms(N,O)andare analogoustobiologicalenvironmentt…     

稀土与苯并咪唑甲基酮缩二乙三胺Schiff碱配合物的合成、表征及生物活性

以邻苯二胺、乳酸、二乙三胺为原料合成双苯并咪唑甲基酮缩二乙三胺Schiff碱化合物,在无水乙醇溶剂中,所得的化合物与稀土离子(Ce3 、Nd3 、Sm3 )配合,合成了三种新型稀土配合物,并对其进行了元素分析、红外光谱测试、差热热重及生物活性研究。钕与苯并咪唑甲基酮缩二乙三胺Schiff碱的配合物对大肠杆菌和霉菌均有较好的杀菌活性;钐与苯并咪唑甲基酮缩二乙三胺Schiff碱的配合物对大肠杆菌有较好的杀菌活性,而对霉菌无活性;铈的配合物对所考察的菌种均无抑制作用。     

Synthesis, Characterization of α-Oxopentanedioic Acid-Isonicotinoyl Hydrazone Rare Earth-Complexes and Relaxivity of Gd-complex

Themagneticresonanceimaging (MRI)tech niqueforthemedicineisveryusefultodiagnosepre tumorandbloodvesseldiseaseinheartandbrainandothermalignantpre diseases .Therefore ,specialatten tionhasbeenalsopaidtoMRIcontrastagents ,whichareindispensablediagnosingdrugsforthemagneticresonanceimagingtechnique[1,2 ] .Gadolinium (Ⅲ)complexwithsomepolycarboxylicandpolyaminelig ands ,suchasGd(DTPA)·nH2 O ,waswidelyusedincliniclongago .OurpreviousworkshowsthatsomepolycarboxylicSchiffbasecomplexeswithrareea…     

Preparation and Characterization of Er2O3 Nanocrystals by Schiff Base Salt Combustion Method

The nanocrystals Er2O3 were prepared by using a combustion method with Schiff base as a chelating agent. The Er(Ⅲ) coordanation compound of Schiff base, obtained from erbium nitrate and retinal Schiff base, underwent a combustion process and voluminous ashes formed when calcimining the complex in air. Pure cubic Er2O3 nanocrystals with a diameter of 13nm were produced. The nanocrystals were homogeneous and rigid coacervation was not observed. The photoluminescence emission spectrum of the erbium (Ⅲ) oxide nanocrystals shows that it has a characteristic peak at 1.54μm, and some other shoulder peaks appear on both sides of the main peak.     

Synthesis and Characterization of Lanthanum Complexes with Amino Acid Schiff Base

Ｉｎｔｈｅｌｉｖｉｎｇｂｅｉｎｇｓ ,ｃａｌｃｉｕｍｉｏｎｐｏｓｓｅｓｓ ｅｓｍａｎｙｋｉｎｄｓｏｆｉｍｐｏｒｔａｎｔｂｉｏｌｏｇｉｃａｌｆｕｎｃｔｉｏｎ .Ｔｈｅｒａｄｉｕｓａｎｄｔｈｅｃｏｏｒｄｉｎａｔｅａｃｔｉｏｎｏｆｌａｎ ｔｈａｎｕｍｉｏｎａｒｅｓｉｍｉｌａｒｔｏｔｈａｔｏｆｃａｌｃｉｕｍｉｏｎ .Ｃｏｎｓｅｑｕｅｎｔｌｙ ,ｌａｎｔｈａｎｕｍｉｏｎ ,ｗｈｉｃｈｅｎｔｅｒｓｔｈｅｂｏｄｙ ,ｗｉｌｌｒｅｐｌａｃｅｃａｌｃｉｕｍｉｏｎａｎｄｓｈｏｗａｓｅｒｉｅｓｏｆｂｉｏｌｏｇｉｃａｌｅｆｆｅｃｔｓ…     

Synthesis,characterization, biological activities and luminescent properties of lanthanide complexes with [2-thiophenecarboxylic acid, 2-(2-pyridinylmethylene)hydrazide] Schiff bases ligand

A Schiff base L [2-thiophenecarboxylic acid, 2-(2-pyridinylmethylene)hydrazide] with its lanthanide metal complexes was synthesized. These complexes were characterized by elemental analysis, molar conductivity measurements, spectral analysis(NMR, FT-IR, and UV-Vis), luminescence and thermal gravimetric analysis. The Schiff base ligand was a tridentate chelate and coordinates to the central lanthanide ion with 1:2 metal:ligand ratio. The conductivity data showed a 1:1 electrolytic nature with a general formula [LnL_2(NO_3)_2]NO_3. The luminescence emission properties for Sm, Tb, and Eu complexes were observed and showed that the ligand L could absorb and transfer energy to Sm(III), Tb(III) and Eu(III) ions. The complexes possessed a good antibacterial activity against different bacterial strains. In addition, the scavenging activity of the Ln(III) complexes on DPPH was concentration dependant and the complexes were significantly more efficient in quenching DPPH than the free Schiff base ligand.     

Construction of NIR luminescent nanoscale lanthanide complexes with new flexible Schiff base ligands

Four mono-and bi-nuclear lanthanide complexes [LnL~1(No_3)(H_2O)DMF](Ln=Nd(1) and Yb(2)) and[Ln_2(L~2)_2(OAc)_2](Ln=Nd(3) and Yb(4)) were synthesized by using two new Schiff base ligands with long(CH_2)_2 NH(CH_2)_2 backbone.The lengths of the Schiff base ligands are about 1.8 nm.The bi-nuclear lanthanide complexes 3 and 4 have nanoscale structures with sizes of approximately 0.7 nm×1.1 nm×1.6 nm.For 3,the molar ratio of Nd:Br:O obtained by the energy dispersive X-ray spectroscopy analysis is in agreement with the crystal structure.The chromogenic Schiff base ligands in1-4 can efficiently transfer energy to lanthanide ions,thus,these complexes exhibit the typical NIR luminescence of lanthanide ions.Interestingly,3 and 4 have higher NIR emission quantum yields(Φ_(em))than 1 and 2,respectively.     

Synthesis, characterization, and anticancer properties of rare earth complexes with Schiff base and o-phenanthroline

Five novel ternary complexes of the rare earth ions with o-phenanthroline（Phen） and Schiff base salicylaldehyde L-phenyla- lanine（KHL） were synthesized in ethanol. Their compositions were characterized by elemental analysis, molar conductance, ^1H NMR, FT-IR, and Raman spectra. The formulas of the complexes were verified to be RE（L）（Phen）Cl（H2O） （RE=La^3＋, Ce^3＋, Nd^3＋, Er^3＋, and Gd^3＋; L=Schiff base salicylaldehyde L-phenylalanine; phen=o-phenanthroline）. Methyl thiazolyl tetrazolium （MTT） colorimetry and flow cytometry were used to test the anticancer effect of the complexes with K562 tumor cell. The research showed that the complexes could inhibit K562 tumor cell＇s growth, generation, and induce apoptosis. The inhibition ratio was accelerated by increasing the dosage, and it had significant positive correlation with the medication dosage.     

Complexation of N＇- [1-（3-aminophenyl）ethylidine] isonicotinohydrazide with La3＋, Pr3＋, Nd3＋, Sm3＋, Eu3＋ and Gd3＋ ions and associated thermodynamics

A novel Schiff base N′-[1-(3-aminophenyl)ethylidine]isonicotinohydrazide was prepared and its complexation behavior towards some selected lanthanides had been studied employing pH-metric and calorimetric titration and spectral techniques. pH-metric studies were carried out for the trivalent La, Pr, Nd, Sm, Eu, and Gd complexes in 30% aqueous-dioxane medium at constant ionic strength of 0.05 mol/L NaClO4 and at different temperatures of 293, 303 and 313 K. The proton-ligand formation constants of the ligand indicated the presence of only one dissociable proton while the metal-ligand formation constants were compatible with the formation of 1:1 Ln(Ⅲ) complexes. The sta-bility of the complexes followed the order: La3+Gd3+, showing a break at gadolinium. The thermodynamic parame-ters, ΔG, ΔH and ΔS associated with protonation and complexation reactions were negative which suggested that all reactions were exother-mic and enthalpy-driven. Isothermal calorimetric studies of Gd3+-aeINH systems at 303 K also showed exothermic nature of the complexation reaction and formation of 1:1 complex in agreement with the pH-metric data. Formation of 1:1 complexes was confirmed by the characteriza-tion of Nd(Ⅲ) complex. A seven coordinated geometry was assigned for the complex based on its elemental and spectral data.     

几种新型Schiff碱及其稀土配合物抑菌活性的研究

采用琼脂稀释法测定了几种新型Schiff碱及其稀土配合物对大肠杆菌、金黄色葡萄球菌、枯草芽孢杆菌的抑菌活性,测得了它们抑制细菌生长的最小浓度。结果表明几种新型Schiff碱及其稀土配合物对几种受试菌均有较强的抑制作用,配合物比相应配体具有更高的抑菌活性。     

Synthesis and Photoluminescence of Three Europium (Ⅲ) Ternary Complexes with New Secondary Ligands of Different Structure

Three new 1,10-phenanthroline derivatives, dipyrido (3,2-f: 2,3-h) quinoxaline (DPQN), imidazo (5,6-f)-(1,10)-phenanthroline (IP) and 3-phenyl-imidazo (5,6-f)-(1,10)-phenanthroline (PIP) were designed and synthesized as a secondary ligand to coordinate with europium (Ⅲ) ion while dibenzoylmethane (DBM) was used as the first ligand. The compositions of the ligands and the europium (Ⅲ) ternary complexes were confirmed by elementary analysis, IR and 1H-NMR spectroscopy. The UV-visible absorption spectra, thermal stability, photoluminescence spectra, quantum yield and fluorescence life time of the Eu(Ⅲ) complexes were investigated. The effect of the structure of the secondary ligand on the photoluminescence of the complexes was discussed. The results show that the synthesized Eu(Ⅲ) complexes are good red-emitiing materials for potential application in fabrication of organic electroluminescence devices.     

Synthesis, Catalysis of Rare Earth Complexes with Aliphatic Noncyclic Polyether-Amino Acid Schiff Base

Coordination chemistry of rare earth with Schiffbase has developed rapidly in the last fewyears ,butthe majority of the complexes studied are derivedfromaromatic Schiff base .So far less papers of rare earthcomplex with aliphatic Schiff base have been rep…     

稀土硝酸盐与希夫碱邻香兰素缩丙氨酸盐及邻菲咯啉三元配合物的合成与表征

合成了稀土硝酸盐与希夫碱邻香兰素缩丙氨酸盐(以KHL表示)及邻菲咯啉的三种固体三元配合物。通过元素分析、差热-热重、红外光谱、紫外光谱及摩尔电导分析等手段,确定配合物的组成为［RE(L)(Phen)(H2O)］NO3,(RE=Y,Nd,Sm)。并对它们的配位方式及某些性质进行了研究。     

Synthesis, Characterization and Activity of Rare Earth Complexes with Schiff Base From 2,6-Diformylpyridine N-Oxide and 4-Amino-antipyrine

Six new rare earth complexes with Schiff base from 2,6-diformylpyridine N-oxide and 4-amino-antipyrine were synthesized. These complexes with general formula REL(NO3)3(RE = La, Pr, Eu, Tb, Er, Y) were characterized by elemental analysis, IR, UV, molar conductance measurements and antimicrobial activity.     

Lanthanide amino acid Schiff base complexes： synthesis, spectroscopic characterization, physical properties and in vitro antimicrobial studies

Complexes of La(Ⅲ),Nd(Ⅲ),Gd(Ⅲ),Sm(Ⅲ),and Ce(Ⅳ) were synthesized with Schiff base [(3,5-di-tert-butyl-2-hydroxybenzyl) amino] acetic acid(H 3 L).The ligand and its complexes were synthesized and characterized based on the following analysis:elemental analyses,FAB-mass,molar conductance measurements,magnetic measurement,UV-visible,IR,and NMR spectral studies.The spectral data revealed that the ligand acted as a neutral tridentate coordinating to metal ion through ONO donor sequence.Thermal degradation studies of the ligand and its complexes showed that the previous lanthanide complexes were more thermally stable than the ligand itself.The Schiff base and its complexes were screened for their antibacterial(Escherichia coli,Staphylococcus aureus) and antifungal(Aspergillus flavus and Candida Albicans).     

两种新型希夫碱及其钴(Ⅱ)配合物的合成与表征

利用1-萘胺分别与邻香草醛和对甲氧基水杨醛反应合成两种新型希夫碱化合物L1和L2;用CoCl2.6H2O分别与L1和L2进行反应,获得了与其相对应两种新的配合物CoCl2L1(1)和CoCl2L22(2)。通过元素分析、红外光谱、1H-NMR及X射线粉末衍射等测试手段,对新型希夫碱及其配合物进行了表征。结果表明,两种希夫碱酚羟基上的H原子与N原子相吸均形成了分子内氢键,并以氢键连接构成了新的六元环。L1和L2作为配体与CoCl2形成配合物时,酚羟基上的H原子没有脱去。配合物1由L1和CoCl2以摩尔比1∶1组成,配体上酚羟基氧及甲氧基氧同时与中心原子Co配位,形成双齿螯合配位构型;配合物2由L2和CoCl2以摩尔比2∶1组成,配体上只有酚羟基氧参与中心原子Co的配位,而甲氧基氧未参与配位。配合物1,2中Co原子均为四配位的。     

Synthesis and luminescence properties of rare earth ternary complexes consisting of Eu(Ⅲ), β-diketones and 1,10-phenanthroline

Three novel β-diketones (HPPP, HTPP, and HFPP) ligands were synthesized by Sonogashira coupling reaction and Claisen con-densation. The structure of β-diketones was confirmed with elemental analysis, IR, NMR and MS spectra. Three new ternary complexes consisting of Eu(Ⅲ), β-diketones, and 1,10-phenanthroline(phen) were synthesized and characterized as ThL3phen (L=PPP, TPP, FPP) with elemental analysis, chemical analysis, and IR spectra, and their luminescence properties were studied.     

一种新型三足席夫碱稀土配合物的合成及与DNA作用方式的研究

合成了一种新型三足席夫碱和它的四种稀土配合物,通过元素分析、红外光谱、紫外光谱、差热-热重、核磁共振和摩尔电导率对配合物进行了表征,推测了配合物的可能结构。应用紫外可见光谱法和电化学方法对配合物与ct-DNA之间的相互作用进行了研究,结果表明,配合物与ct-DNA之间存在插入作用;配合物CV测试随扫描速度增加,其氧化峰电位Ep发生正移,氧化峰电流Ip随扫描速度的增加呈线性增加趋势,并且Ip与扫描速率平方根(v1/2)呈良好线性关系,表明配合物在GCE上的电化学氧化反应是一个受扩散步骤所控制的过程。     

Synthesis and Application of Lanthanide Complexes with Schiff Base of Pridoxylidence-Glycine

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Synthesis and Characterization of Some Lanthanide（Ⅲ） Complexes with 4- [N-（2-methoxy benzylinine）formy1]-2, 3-dimethyl-1-phenyl-3-pyazolin-5-one

A series of seven novel lanthanide（Ⅲ ） nitrato complexes with 4-[ N-（2-methoxybenzylimine）formyl] 1-2, 3- dimethyl-1-phenyl-3-pyazolin-5-one （2mbfa）, were synthesized. These complexes were characterized by elemental analysis, molecular mass determination, conductance and magnetic moment measurements, IR, UV-visible, and ^13CNMR spectral studies, In these complexes, the Schiff base, 2mbfa, acts as neutral bidentate ligand by utilizing the carbonyl oxygen and azomethine nitrogen as donor sites. All the three nitrate ions are also coordinated unidentately with 7 coordination for the lanthanide（Ⅲ） ions with a tentative monocapped octahedral geometry for the complexes. All the seven lanthanide（Ⅲ） complexes have a general formula, [ Ln（2mbfa）：（NO3）3 ].