Luminescent Properties of Bi-Rare Earth Complexes with m-methylbenzoic Acid and 1, 10-phenanthroline

Ｔｈｅｒｅｈａｓｂｅｅｎａｇｒｏｗｉｎｇｉｎｔｅｒｅｓｔｉｎｔｈｅｌｕｍｉｎｅｓｃｅｎｃｅｐｒｏｐｅｒｔｉｅｓｏｆｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘ ｅｓｗｉｔｈｏｒｇａｎｉｃａｃｉｄｓ ,ｓｕｃｈａｓａｒｏｍａｔｉｃａｃｉｄｓｏｒｐｈｔｈａｌｉｃａｃｉｄｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｐｏｔｅｎｔｉａｌｃｈｅｍｉｃａｌａｎｄｂｉｏｌｏｇｉｃａｌａｐｐｌｉｃａｔｉｏｎｆｏｒｐｒｏｂｅｓａｎｄｌａｂｅｌｓ .Ｅｕ3 + ａｎｄＴｂ3 + ｈａｖｅｍｏｒｅｅｘｃｅｌ ｌｅｎｔｌｕｍｉｎｅｓｃｅｎｃｅｐｒｏｐｅｒｔｉ…     

Studies on synthesis and fluorescent property of rare earth complexes RE（ABMF）2AA and copolymers RE（ABMF）2AA-co-MMA

Four new complexes RE(ABMF)2AA (RE=Sm, Eu, Tb, Dy) were synthesized by the reaction of RECl3·6H2O with acrylic acid (HAA) and 1-(2-furyl)-3-phenyl-1,3-propanedione (ABMF). The copolymerization of the rare earth complexes with methyl methacrylate was studied by using 2,2-azobis-isobutyronitrile as an initiator. The composition and structure of the four complexes were characterized by elemental analysis, UV-vis and FTIR. The glass transition temperature and molecular weight of the copolymers were determined. Photoluminescent measurement showed that ligand ABMF could efficiently transfer the energy to Sm3+ and Eu3+ ions in the complexes and sensitize the luminescence of the rare earth ions, but could not sensitize Tb3+ and Dy3+ ions. As a result, both Sm3+ and Eu3+ complexes emitted the characteristic fluorescence of Sm3+ and Eu3+ ions due to the f-f transitions. The four copolymers could emit strong fluorescence of the rare earth ions.     

Synthesis and Luminescence of Complexes EuxY1-x（phen）L3

A series of binuclear complexes with different molar ratio of europium to yttrium with cinnamic acid and o-phenanthroline were synthesized in anhydrous alcohol. Elemental analysis shows that the composition of the complexes areEuxY1-x(phen)L3(L: C6H5CH=CHCOO, x = 1.0, 0.7, 0.5, 0.3 and 0.1). The IR absorption spectra indicate that cinnamate is coordinated to the rare earth ions and chemical bonds are formed between rare earth ions and nitrogen atoms of o-phenanthroline. Fluorescent spectra show that the emission of Eu^3 ion can be greatly enhanced if some of europium ions in the complexes are substituted by yttrium ions.     

Synthesis and Fluorescence Property of Eu^3 ＋ , Tb^3＋ Perchlorate Complexes with Diphenyl Sulfoxide and 1,10-Phenanthroline

Eu3 ,Tb3 canemitfluorescenceinconjugatedsystemcontainingorganicligand[1,2 ] ,forexample ,1 ,1 0 phenanthroline ,becauseithasbettercoordina tionabilityandbiggerconjugationsystem ,soitcantransmitenergyeffectivelytoEu3 ,Tb3 ,leadingtofluorescenceemission ,andthestabilityisveryhigh ,butsolubilityisverypoor .Inaddition ,diphenylsul foxidehasbettercoordinationabilityandbiggerconju gationsystem ,too .Soitcanalsotransmitenergyef fectivelytoEu3 ,Tb3 ,resutlinginfluorescencee mission ,andsolubi…     

Synthesis, Characterization and Fluorescence of Rare earth Nitrate Complexes with Triaza-crown Ether Derivative

Sinceaza crownethershowsspecialcoordinationpropertiestotransitionmetalandheavymetalions[1,2 ] ,therearemanyreportsofthecomplexesinhost guestchemistry ,molecularrecognition[3 ,4] andionophoreinmembranetransportation[5] ,butthereislittlereportontheirrareearthscomplexesandthefluorescenceaboutthecomplexes[6] ,andthefluorescenceintensityoftheircomplexesarenotverystrong .Weinsetbenzoylgroupintothemacrocycle ,expectingthatitsrareearthscomplexeshavebetterfluorescenceproperties .Inthispaperthesynthesis…     

稀土铕,铽β-二酮配合物的合成与发光性能

采用Claisen缩合反应合成了一种新型的β-二酮化合物1-(4-溴苯)-3-苯基丙烷-1,3-二酮(L),并以其为第一配体,邻菲罗啉(phen)为第二配体,合成出新型稀土铕,铽二元及三元配合物。通过元素分析、红外光谱、紫外光谱、荧光光谱对合成的配体及配合物进行了表征。元素分析确定了配合物的组成。红外光谱的分析表明第一配体L中的氧原子以及第二配体phen中的氮原子与稀土离子进行了配位。紫外光谱表明第一配体L为能量的给体,第二配体phen起协同作用。通过荧光光谱研究了配合物的发光性质,结果显示三元配合物的发光强度大于二元配合物,三元配合物Eu(L)3phen表现出Eu3+的特征发射,在593,615,653,701 nm处的发射峰分别归属于Eu3+的5D0→7Fj(j=1,2,3,4)能级间的跃迁,并且以位于615 nm处的5D0→7F2电子跃迁所发出的荧光强度最大;而铽配合物中并没有出现Tb3+的特征发射。进一步的研究表明,这是由于配体L的最低三重态能级较适合Eu3+的发射能级,配体L吸收的能量可以有效的通过Antenna效应传递给稀土中心离子,使得三元配合物Eu(L)3phen的发光强度较大。     

Synthesis and fluorescence properties of Eu（Ⅲ）, Tb（Ⅲ） and Sm（Ⅲ） with β-diketone and 2,2＇- bipyridine

Three new rare earth ternary complexes,RE(PPP)3bpy(RE=Sm 3+ ,Eu 3+ ,Tb 3+ ),were synthesized by the reaction of 1-phenyl-3-(p-phenylethynylphenyl)-1,3-propanedione(HPPP)and 2,2′-bipyridine(bpy)with rare earth chloride RECl3,respectively,in alcohol solution. The compositions were characterized by means of infrared(IR)spectra,chemical analysis,elemental analysis,and thermodynamic analysis.Luminescent properties of the three complexes were studied.At room temperature,under UV light excitation,the Sm 3+ ,Eu 3+ and Tb 3+ complexes exhibited characteristic emission of the central ions.The fluorescence spectra showed that the fluorescence emission intensity of Eu 3+ complex was the strongest.The narrow strongest emission band of Eu 3+ complex was considered to be a valuable material with bright red fluorescence.     

Synthesis, characterization and properties of some rare earth complexes with 2,6-pyridine dicarboxylic acid and α-Picolinic acid

Five novel ternary complexes were synthesized by the rare earth with 2,6-pyridine dicarboxylic acid andα-picolinic acid.These complexes were characterized by elemental analysis,molar conductivity,FT-IR,UV-Vis,Raman,TG-DTA and XRD.The general formula of the complexes was[RE(DPA)(L α )(H2O)]·2H2O(RE=Pr 3+ ,Nd 3+ ,Sm 3+ ,Eu,Er 3+ ;DPA=2,6-pyridine dicarboxylic acid;L α =α-picolinic acid). The investigation of fluorescence properties of the Eu-complex showed that the Eu(III)ion could be sensitized efficiently by the ligand to some extent.The antibacterial activity test indicated that all the five complexes exhibited antibacterial ability against Escherichia coli and Staphylococcus aureus with broad antimicrobial spectrums.     

铕铽混合掺杂聚合物的发光性能与微观形貌

将具有荧光性质的铕、铽以三异丙氧基稀土单一或混合的形式掺入甲基丙烯酸甲酯(MM A)或甲基丙烯酸甲酯与苯乙烯(S t)的混合单体中,形成凝胶,经原位聚合制备铕、铽单一或混合掺杂的PMM A或P(MM A-co-S t)聚合物,研究铕铽混合掺杂对材料发光性能的影响,并观察聚合物的微观形貌。结果表明:铕、铽混合掺杂PMM A或P(MM A-co-S t)中,主要呈现Eu3+的特征荧光,并使Eu3+发射强度显著提高;T b3+544nm处最强的发射峰消失了,而较弱的621nm处的发射峰却显著增强。ESEM显示了掺杂聚合物呈交联网络状的微观形貌。     

Luminescence of Terbium Complexes Incorporated into Silica Matrix

Ｔｈｅｓｏｌ ｇｅｌｍｅｔｈｏｄｈａｓｓｈｏｗｎａｓｕｉｔａｂｌｅａｐｐｒｏａｃｈｆｏｒｔｈｅｐｒｅｐａｒａｔｉｏｎｏｆｎｏｖｅｌｌｕｍｉｎｅｓ ｃｅｎｔｍａｔｅｒｉａｌｓ .Ｍａｎｙｒｅｃｅｎｔｗｏｒｋｓｈａｖｅｆｏ ｃｕｓｅｄｏｎｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｓｏｌｉｄ ｓｔａｔｅｔｕｎａｂｌｅｄｙｅｌａｓｅｒｍｅｄｉａｕｓｉｎｇｏｒｇａｎｉｃｄｙｅｄｏｐａｎｔｓ[1 ,2 ]ａｎｄｔｒｉｓ( 2 ,2′ ｂｉｐｙｒｉｄｉｎｅ)ｒｕｔｈｅｎｉｕｍ (Ⅱ )ｃｏｍ ｐｌｅｘ[3 ,4 ] ｗｈｉｃｈｃａｎｈａｖｅｓｏｍｅｐｏ…     

Synthesis, Characterization and Luminescent Properties of Complexes of Rare Earth Nitrates with 2,2′:4′,4″:2″,2-Quaterpyridine

The rare earth nitrate complexes with 2,2′:4′,4″:2″,2-quaterpyridine (L) were prepared in ethylacetate. These new complexes with the general formula [RE(NO3)3L]*H2O (RE = La, Pr, Eu, Tb, Er, Y) were characterized by elemental analysis, IR spectra, thermal analysis and molar conductance measurements. The luminescence properties of these complexes were also studied.     

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.     

苯甲酰胺-桂皮酸-铕-镧配合物的红外光谱及荧光光谱研究

用氯化铕和氯化镧混合溶液与苯甲酰胺及桂皮酸铵在水溶液中反应 ,合成了苯甲酰胺 -桂皮酸 -铕-镧配合物 ,其化学组成式为 ( Eux L a1- x) L′L3(其中 L′代表 C6 H5CONH2 ,L 代表 C6 H5CH=CHCOO- ,x分别为1 .0 0 ,0 .90 ,0 .70 ,0 .50 ,0 .30和 0 .1 0 )。测定了配合物的红外光谱及荧光光谱。结果表明 ,苯甲酰胺的氧原子和氮原子均与稀土离子配位 ;桂皮酸的羧基氧与稀土离子成键。在系列配合物中 ,由不发光的 La3 离子取代部分发光的Eu3 离子 ,可明显提高 Eu3 离子的特征荧光。本文对发光机理进行了初步探讨。     

Preparation and characterization of complexes of RE^3＋ with furfural modified water-soluble chitosan

Degraded chitosan, with highly water-solubility, was obtained by the oxidation of chitosan with H2O2, and then reacted with furrural. The final product coordinated with the rare earth ions （RE^3＋ = Sm^3＋, Eu^3＋）, which led to the formation of the complexes. The prepared complexes were characterized with Infrared Spectroscopy （IR）, Ultra Violet （UV）, fluorescence, X-Ray Diffraction （XRD）, and Thermogravimetric-Differential Scanning Calorimetry （TG-DSC） measurements.     

Emission of Rare Earth Complex Tb0.5Eu0.5 （asprin）3phen

The coprecipitate Tho.sEuo.5(asprin)3phen was synthesized. By doping the rare earth complex into polymer PVK, the EL device was fabricated with the structure of ITO/PVK: RE/PBD/AI. Compared with the device using PVK/Eu (asprin)3phen blend as the light emitting layer, the emission of Eu^3 in the PVK/Th0.5Eu0.5(asprin)3 phen blend is great-ly enhanced along with the quenching of the emission of PVK.     

Influence of Blending Temperature on Fluorescence Properties of Silicone Rubber Matrix Eu(TTA)2(phen)(MA) Composites

A series of fluorescent composites were prepared by blending silicone rubber with Eu(TTA)2(phen)(MA). The influence of mechanical blending temperature on fluorescent intensity of composites and dispersion of rare earth complexes in the SiR matrix were investigated. As for the cured rubber, it is found that its fluorescent intensity is relatively low compared with that of uncured rubber. Low temperature is beneficial to dispersion of Eu(TTA)2(phen)(MA) homogeneously. When the amount of rare earth complexes is low, the fluorescent intensity of composites prepared by mechanical blending method above melting point of Eu(TTA)2(phen)(MA) is much higher than that of composites prepared below melting point.     

Preparation of Eu （ TTA ）2 phen （ MA ）/SiR Fluorescent Materials under High Mechanical Blending Temperature

Eu（TTA）2（phen）（MA） complexes were synthesized, in which MA was introduced as the acidic ligand to increase the fluorescent intensity of the complexes. The complexes were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, and fluorescent spectra, respectively. Different amounts of rare earth complexes were blended with silicon rubber over the melting point of Eu （TTA） 2 （phen） （MA）. Next, a definite amount of 2,5-dimethyl-2, 5-di （tert-butylperoxy） hexane was added as a cross linker to the composite, to get the uncured composites. Subsequently, the composites were vulcanized at 160℃, and silicon rubber-based composites with different contents of the complexes were prepared and their fluorescent properties were observed. The contents of rare earth complexes were 0.96 %, 2.83 %, 4.63 % and 6.36 % （mass fraction）, respectively. Moreover, the composites of Eu （TTA） 2 （phen） （ MA ）/SiR were measured by SEM, XRD, and fluorescent spectra. The measurement result shows that the fluorescent intensity of uncured rubber is similar to one of the pure rare earth complexes. However, there is no marked change of fluorescent intensity in the uncured rubber when the content of rare earth complexes continues to increase.     

Synthesis and Fluorescence Properties of Europium,Terbium Doped Zn^2＋, Cd^2＋, and Cr^3＋ Complexes

Europium and terbium complexes with strong fluorescence intensity and long fluorescence lifetime were prepared. By replacing half of the europium or terbium ion with M （M = Zn^2＋, Cd^2＋, and Cr^3＋） using the doped method, and then incorporating it with 18-crown-6 ether and terephthalic acid, six heteronuclear samples EuZnLL＇Cl3·3H2O（1）, EuCdLL2＇Cl3·5H2O（2）, EuCrLL＇Cl4· 4H2O（3）, TbZnLL＇Cl3·4H2O（4）, TbCdLL＇2Cl3·4H2O（5）, and TbCrLL＇2Cl4 ·4H2O（6） （L = terephthalic acid, L＇= 18-Crown-6 ether） were obtained. The elemental analysis, molar conductivities, rare earth complexometry, Fourier Transform Infrared Spectroscopy （FT-IR）, ultraviolet （UV）, TGA, fluorescence intensity, and fluorescence lifetime of the samples were measured. The results showed that there were good luminescence properties for heteronuclear complexes （1）, （2）, （4）, and （5）, which were even stronger than those of the homonuclear complexes Eu2LL＇2Cl4·4H2O and Tb2LL＇2Cl4 ·4H2O, but the luminescence properties of EuCrLL＇Cl4·4H2O, TbCrLL＇Cl4·4H2O were very weak. A possible luminescence mechanism was suggested by the organic-inorganic doped mechanism and the law of intramolecular energy transfer.     

Fluorescence Properties of Eu3+/Gd3+/Citric Acid Mixed Complexes Doping in Silicon Rubber Matrix

Series of doped rare earth complexes-EuxGd(1-x)(CA)3·nH2O (CA=citric acid) were synthesized. Some characterizations were taken for these complexes. The experimental results shows that the doped rare earth complexes have the best fluorescence property when the ratio of Eu and Gd is from 0.7 to 0.3. Silicon rubber-based composites were prepared by mechanical blending the EuxGd(1-x)(CA)3·nH2O and silicon rubber. Then, the fluorescent property of the composites was studied. It is found that the fluorescence intensity of the composites increase linearly with the contents of the rare earth complexes increasing.     

邻氨基苯甲酸-联吡啶-混合稀土(Eu、Tb)配合物的荧光研究

:研究用邻氨基苯甲酸铵、2 ,2’-联吡啶与氯化铕、氯化铽在水 -乙醇溶液中反应合成了邻氨基苯甲酸- 2 ,2’-联吡啶 -铕铽异核稀土配合物 ,并测定了配合物的红外光谱。红外光谱数据表明 :邻氨基苯甲酸中的羧基和氨基均与稀土离子配位 ,联吡啶中的氮也与稀土离子配位 ;由元素分析数据推测 ,配合物的化学组成式为(Eux Tb1 - x) L3L′(其中 L 为邻氨基苯甲酸 ,L′为 2 ,2’-联吡啶 ) ;在 35 1nm紫外光激发下 ,研究了配合物的荧光光谱 ,结果表明 ,Eu3 的荧光发射被 Tb3 强烈敏化 ,而 Tb3 的荧光发射被 Eu3 离子强烈猝灭