芳羧酸功能化的聚苯乙烯与Tb(Ⅲ)离子形成的 高分子-稀土配合物的荧光发射性能

通过大分子反应将苯甲酸(BA)键合在聚苯乙烯(PS)侧链, 制得芳羧酸功能化的聚苯乙烯PSBA。以PSBA为大分子配基, 以邻菲啰啉(Phen)为小分子配体, 与Tb(Ⅲ)离子配位, 分别制备了二元配合物PS-(BA)₃-Tb(Ⅲ)与三元配合物PS-(BA)₁-Tb(Ⅲ)-(Phen)₂及PS-(BA)₁-Tb(Ⅲ)-(Phen)₃,采用红外光谱(FTIR)和紫外吸收光谱(UV) 对配合物进行了表征, 深入研究了配合物(溶液与薄膜)的荧光发射性能。 研究结果表明, 大分子配基PSBA与Tb(Ⅲ)离子所形成的二元或三元高分子-稀土配合物均能发射出很强的Tb(Ⅲ)离子特征荧光, 即键合在PSBA侧链的配基BA能有效地敏化Tb(Ⅲ)离子的荧光发射。与二元配合物相比较, 以小分子Phen为第二配体所形成的两种三元配合物具有强度更高的荧光发射。     

铕与苯甲酸、邻菲啰啉系列配合物的合成和光谱分析

合成了铕与苯甲酸(BA)二元配合物及铕与BA、邻菲啰啉(Phen)三元配合物,研究了配合物的红外、紫外吸收光谱及荧光光谱.紫外光谱的研究表明,配合物的紫外吸收主要表现为配体的吸收,配体吸收能量传递给中心离子Eu3+.配合物红外光谱不同于配体的红外光谱,羧基的对称伸缩振动vm (coo-)移至1418cm-1,反对称伸缩振动vaa(COO-)移至1562cm-1,表明稀土与配体之间形成了配位键;测定了配合物及其防伪油墨的荧光性能,铕与苯甲酸、邻菲啰啉形成的三元配合物表现出中心离子Eu3+的特征荧光,616nm荧光发射最强谱蜂对应Eu3+的5D0→7F2跃迁.制备的稀土荧光防伪油墨在可见光下印迹无色,在紫外灯下呈现明显红色荧光.     

（EUxRE1-x）（FTFA）3Phen配合物的合成、表征及荧光性能

在无水乙醇溶液中用氯化稀土与4,4,4-三氟-1-(2-呋喃基)-1,3-丁二酮(FTFA)和邻菲啰啉(Phen)反应,合成了标题配合物;对其进行了元素分析、摩尔电导、红外光谱分析及荧光性能的研究。结果表明其化学组成分别为Eu(FTFA)3Phen、Sm(FTFA)3Phen;(Eu0.5RE0.5)(FTFA)3Phen(RE=Y,La和Gd)及(EuxGd1-x)(FTFA)3Phen(x=0.1,0.3,0.4,0.7,0.9)。配体FTFA通过烯醇式氧负离子与稀土离子双齿螯合配位,Phen的两个氮原子与稀土离子呈环状配位;所有配合物均为非电解质。光谱实验结果表明,铕配合物的荧光发射强度要远大于钐配合物的荧光强度;对于铕系列掺杂配合物来讲,所有激发光谱都为一宽带峰,表明配体能很好的吸收能量;在荧光惰性Gd3 离子的含量0.1相似文献   

铕-2-羟基喹啉-4-羧酸配合物的合成及光谱性能

以Eu3+为中心离子,2-羟基喹啉-4-羧酸(H2hqc)、1,10-菲罗啉(Phen)和三苯基氧磷(TPPO)为配体,合成了新型配合Eu(Hhqc)3(H2O)、Eu(Hhqc)3Phen(H2O)5和Eu(Hhqc)3TPPO(H2O)5.用元素分析和红外光谱对配合物进行了表征,IR表明配合物Eu(Hhqc)3Phen(H2O)5的Δν值大于钠盐Δν值,配合物中羧酸根以单齿方式配位.而配合物Eu(Hhqc)3(H2O)和Eu(Hhqc)3TPPO(H2O)5Δν值均小于钠盐的Δν值,表明配合物中羧酸根与Eu3+呈螯合双齿配位方式.室温下测定了配合物的荧光光谱,研究了它们的荧光性能.结果表明,配合物均在581,594,615,654和703nm附近产生五条谱带,为Eu3+的特征发射,归属为5 D0→7 FJ(J=0,1,2,3,4)能级间的跃迁,第二配体Phen和TPPO的引入对Eu3+的荧光发射有明显增强作用,且Phen效果更好.     

水杨醛甘氨酸席夫碱-含氮杂环稀土配合物的合成及其与DNA作用的光谱研究

合成了以水杨醛甘氨酸席夫碱（Sal-GlyK）、邻菲罗啉（Phen）和2,2’-联吡啶（Bipy）为配体、Eu³⁺、La³⁺为中心的配合物。对其进行了元素分析和摩尔电导、红外光谱及紫外吸收光谱测定,推测配合物的组成分别为RE（Sal-Gly）（NO₃）·2H₂O和RE（Sal-Gly）（Phen）（NO₃）·H₂O、RE（Sal-Gly）（Bipy）（NO₃）·H₂O（RE³⁺=Eu³⁺,La³⁺）。通过紫外吸收光谱及荧光光谱研究了稀土配合物与小牛胸腺DNA的作用方式及其结合常数。结果表明,本文合成的配合物与DNA的结合能力的顺序为RE（Sal-Gly）（Phen）（NO₃）·H₂O>RE（Sal-Gly）（Bipy）（NO₃）·H₂O >RE（Sal-Gly）（NO₃）·2H₂O,表明配合物是以插入方式与DNA结合,含有良好平面性和较大表面积配体的配合物可以更好地插入到DNA的碱基对中。     

稀土三元配合物粉末和凝胶共发光效应的光声光谱研究

合成了Eu（TTA）3·Phen和Eu0.8Y0.2（TTA）3·Phen固体配合物微晶粉末及其掺杂的SiO2凝胶样品。在300－800nm测定并解释了其光声光谱。在配体吸收处，Eu0.8Y0.2（TTA）3·Phen的光声强度低于Eu（TTA）3·Phen的光声强度；而对于配合物掺杂的凝胶样品，则情况相反。Y^3+的引入改变了配合物的弛豫过程，且配合物在粉末和凝胶状态下，弛豫历程不尽相同。结合荧光光谱研究了标题化合物的发光特性，并建立了能量传递模型。     

[Zn（Phen）（5-Fu）_2]（NO_3）_2与牛血清白蛋白相互作用的荧光光谱

以Zn（）为中心离子,5-氟脲嘧啶（5-Fu）和邻菲口罗啉（Phen）为配体,合成了[Zn（Phen）（5-Fu）2]（NO3）2配合物,并利用荧光光谱考察了该配合物与牛血清白蛋白（BSA）的相互作用。实验结果表明,配合物与BSA作用可导致BSA内源荧光猝灭,其猝灭机理为静态猝灭,结合常数Ka=1.56×106L/mol,结合位点数n=1.40,且该配合物能够猝灭BSA分子表面94.0%的色氨酸（Trp）残基,是良好的BSA猝灭剂。     

Eu(BA)_3Phen掺杂聚丙烯腈纳米纤维的荧光特性研究

通过苯甲酸和1,10-菲啰啉为配体合成Eu(BA)3Phen三元配合物,并利用静电纺丝技术制备了以聚丙烯腈聚合物为载体的荧光纳米纤维.采用扫描电子显微镜、荧光和绝对光谱测试分别对其微观形貌和荧光特性进行研究.测试与分析结果表明,Eu(BA)3Phen配合物掺杂聚丙烯腈纤维直径约为200nm,直径均匀且取向随机.在中波紫外辐射下,纳米纤维呈现出明亮的红色荧光.随着Eu(BA)3Phen配合物掺杂量的增加,配体到稀土离子之间能量传递更有效,使得纳米纤维的发光强度显著增强.在电功率为115.61mW的308nm中波紫外发光二极管激发下,1wt%、2wt%和4wt%Eu(BA)3Phen掺杂聚丙烯腈纳米荧光纤维总的发射光子数分别为25.71×10~(11)、61.50×10~(11)和106.12×10~(11) cps,其中Eu3+的5D0’7F2跃迁发射的光子数分别高达15.98×10~(11)、41.21×10~(11)和70.76×10~(11) cps.纤维中Eu3+在5D0’7F2发射的最大受激发射截面为4.12×10-21 cm~2,呈现出纳米荧光纤维较强的光辐射能力.光谱参数的绝对化表征表明Eu(BA)3Phen掺杂聚丙烯腈纳米纤维光子转换的高效性,展示了其作为紫外-可见光转换层在柔性太阳能电池增感领域广阔的应用前景.     

偏苯三甲酸铕（Ⅲ）系列四元配合物的合成及相关性能研究

合成了Eu（Ⅲ）与偏苯三甲酸（TLA）、2-噻酚甲酰三氟丙酮（HTTA）和邻菲罗啉（Phen）形成的两个新的四元配合物。运用元素分析、红外光谱、扫描电镜、热重与荧光光谱等手段对它们进行了系统的表征。研究结果表明,偏苯三甲酸与2-噻酚甲酰三氟丙酮Eu（Ⅲ）和邻菲罗啉形成的四元配合物,具有比偏苯三甲酸Eu（Ⅲ）和邻菲罗啉形成的三元配合物更强的荧光强度与更宽的紫外激发,比配合物Eu（TTA）3Phen更好的热稳定性。得到了两种热稳定性较好的鲜艳红色荧光材料。     

1,3-二苯基-4-酰基-5-吡唑酮Eu(Ⅲ)配合物的荧光性质

以四种1,3－二苯基－4－酰基－5－吡唑酮（酰基分别为苯甲酰基、苯乙酰基、丁酰基和氯乙酰基,化合物以DPBZP、DPPAP、DPBTP和DPCAP表示）为配体,合成了Eu(Ⅲ）的二元和三元配合物。通过化学分析和元素分析确定了配合物的组成,通过FTIR谱对配合物进行了表征。测定了配合物的荧光光谱,结果表明：配合物发射Eu(Ⅲ）的特征荧光;配合物荧光;配合物荧光强度与配体吡唑环4－位酰基上的取代基团密切相关,荧光强度随配体不同的变化顺序为DPBZP＜DPPAP＜DPCAP;第二配体邻菲罗啉具有较为明显的荧光增强作用。     

Ordered luminescent nanohybrid thin films of Eu(BA)3Phen nanoparticle in polystyrene matrix from diblock copolymer self-assembly

A simple route for fabricating highly ordered luminescent thin films based on hybrid material of diblock copolymer and europium complex, assisted with self-organization of polystyrene-block-poly(ethylene oxide) (PS-b-PEO) diblock copolymer upon solvent annealing, is presented. PS-b-PEO self-organized into hexagonal patterns and europium complex of Eu(BA)₃Phen was selectively embedded in PS blocks after solvent annealing in benzene or benzene/water vapor. During benzene annealing, the orientation of the PEO cylindrical domains strongly depended on the Eu(BA)₃Phen concentration. In contrast, when the hybrid thin films were annealed in mixture of benzene and water vapor, high degree of orientation of the PEO cylindrical domains is more easily obtained, which is independent of Eu(BA)₃Phen concentration. Furthermore, preferential interaction of PEO domains with water induces a generation of nanopores in the hybrid thin film. Atomic force microscopy (AFM), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were used to characterize the long-range lateral order and phase composition of the hybrid thin films. The ordered nanohybrid thin films kept the fluorescence property of Eu(BA)₃Phen and showed a strong red emission under the 254 nm light's irradiation. The fluorescence property was confirmed by photoluminescence (PL) spectra.     

Luminescent properties of encapsulation of europium complex into meso-structured silica monoliths

Meso-structured silica monoliths using PEG (PEG=polyethylene glycol) as a low-cost template and synthesized via sol-gel methods were used as host materials for incorporation of europium complexes Eu(BA)₃Phen (BA=benzoic acid and Phen=1,10-phenanthroline). The meso-structured silica was silylated by 3-aminopropyltriethoxysilane (APTES) or 3-glycidoxypropyltrimethoxysilane (GPTMS) before wet impregnation. Samples were characterized by BET, diffuse reflectance (DR) spectroscopy, infrared spectroscopy and fluorescence measurements. The results showed that the emission quantum efficiency of GPTMS silylated meso-structured silica with larger pore size was up to 44.6%. Also, the lifetime measurement showed the complex encapsulated in this rigid matrix had longer lifetime than the pure complex in solid or liquid.     

Luminescent Properties of a Polymer Photoluminescent Composite Containing the Binuclear (EU,TB) Complex as an Emitter

Uninuclear europium (Eu), as well as binuclear Eu and terbium (Tb), complexes were synthesized using acrylic acid (AA) as the first ligand and 1,10-phenanthroline (Phen) as the second ligand. The relative weight ratio of the europium (III) (Eu³⁺) to terbium (III) (Tb³⁺) ions of the binuclear complex was 1:1 as determined via energy dispersive X-ray analysis. The structures of the Eu(AA)₃Phen and Eu_0.5Tb_0.5(AA)₃Phen complexes were characterized by Fourier transform infrared spectroscopy. A series of tri-cellulose acetate (TCA)/ the Eu(AA)₃Phen and TCA/Eu_0.5Tb_0.5(AA)₃Phen composites were prepared by solution blending, and their luminescent properties were investigated by fluorescence spectrophotometry. The excitation spectra of all composites indicated that the TCA matrix probably affected the energy absorption and transfer of organic ligands. In TCA/Eu_0.5Tb_0.5(AA)₃Phen composites the introduced Tb³⁺ ions had some influence on energy absorption and transfer of organic ligands; the energy transfer process of the complex is suggested to be as follows: Phen→AA→Tb³⁺ion→Eu³⁺ion. The emission spectra indicated that the luminescent intensity of the TCA/Eu_0.5Tb_0.5(AA)₃Phen composites was noticeably stronger than that of the TCA/Eu(AA)₃Phen composites, suggesting that the comparatively stable and high-efficiency energy transfer process was only slightly influenced by the TCA matrix. In summary, the TCA/Eu_0.5Tb_0.5(AA)₃Phen (90/10) composite possesses fine luminescent properties for potential usage as red fluorescent materials.     

铕(Ⅲ)配合物的合成及发光性能研究

分别以1,10-邻菲咯啉、三苯基氧磷、2,2’-联吡啶为第二配体,以苯甲酰丙酮为第一配体,合成了3种铕(Ⅲ)配合物。通过红外光谱、紫外-可见光吸收光谱和荧光光谱对其性能进行了表征。初步从理论上探讨了不同的第二配体对铕(Ⅲ)配合物光致发光性能的影响,并建立了分子内能量传递模型。结果表明：配体和配合物对紫外光都有强烈吸收,所有配合物在紫外光激发下均能发射Eu3+的特征荧光;第二配体与Eu3+间的能级差以及第一配体与第二配体间的能级差都会影响铕(Ⅲ)配合物的荧光量子效率。     

Synthesis and luminescence properties of europium (III) complexes

Three types of europium complexes were synthesized by introducing benzoylacetone as the first ligand and 1, 10-phenanthroline, triphenylphosphine oxide, 2,2'-bipyridyl as the second ligand, respectively. The properties of above materials were characterized by infrared absorption spectra, UV-Vis absorption spectra and fluorescence spectra. Then, it was discussed that the different second ligands of europium complexes can affect their luminescence properties, and their intramolecular energy transfer models had been set up. The results indicated that ligands and complexes have a strong absorption of UV light and the three types of europium complexes exhibit characteristic luminescence of europium ion when excited by UV light. In addition, it is suggested that the fluorescence yield of europium complexes mostly depend on both the energy difference between the second ligand and the Eu3+ ion and the energy difference between the second ligand and the first ligand.     

铕-芳香羧酸-丙烯腈三元配合物的合成及发光性能研究

以对甲基苯甲酸、大茴香酸、间氯苯甲酸、苯甲酸和对羟基苯甲酸为第一配体,丙烯腈为反应型配体,合成了五种新的铕-芳香羧酸-丙烯腈三元配合物.通过元素分析,EDTA配位滴定分析,热分析,红外、紫外和荧光光谱分析对目标配合物的组成、结构进行了表征,并研究了它们的发光性能.结果表明,五种新的反应型铕三元配合物均具有良好的发光性能,各芳香羧酸向铕离子传递光能的能力为:对甲基苯甲酸＞苯甲酸＞间氯苯甲酸＞对羟基苯甲酸＞大茴香酸,将这些含反应型配体丙烯腈的发光铕配合物引入高分子化合物中可望合成出键合型铕高分子发光材料.     

Spectroscopic studies on the luminescence properties of ternary europium complexes with different ligands

In this paper, ligand effect of several bi-dental oxygen (O) and nitrogen (N) ligands on the red luminescence properties of europium ion (Eu³⁺) was studied comprehensively. Absorption, emission, and excitation spectral properties of ternary europium complexes with different combinations of ligands including thenoyl trifluoroacetone (TTA), naphthyl trifluoroacetone (NTA), 2,2′-bipyridyl (bpy) and phenanthroline (Phen) were investigated. Efficient Eu³⁺ red emission was observed with all the combinations of the above mentioned ligands. The most intense emission was found with the all nitrogen coordinated complex Eu(bpy)₂(Phen)₂ while the longest wavelength excitation band was recorded with oxygen-nitrogen mixed NTA-bpy complex Eu(NTA)₁(bpy)₃. With change of the ligands combination and ratio, the Eu³⁺ emission peak changes slightly from 612 to 618 nm. The absorption and excitation spectra of the europium complexes were compared and analyzed referring to the individual absorption spectral properties of the ligands. The relation between ligand-to-metal charge transfer states and luminescence intensities for different complexes was studied.     

2-(4-氟代苯甲酰基)苯甲酸-铕配合物的合成、结构表征及荧光性能的研究

以硝酸铕、2-(4-氟代苯甲酰基)苯甲酸(HL)、1,10-菲咯啉(Phen)和三苯基氧膦(TPPO)合成了EuL₃(H₂O)₆,EuL₃Phen(H₂O)₄和EuL₃(TPPO)(H₂O)₅三种固态配合物。用元素分析、红外光谱、核磁共振氢谱对配合物进行了组分确定和结构表征。IR表明,2-(4-氟代苯甲酰基)苯甲酸与Eu3+形成配合物后,位于1 692 cm-1处羧基的ν_CO峰消失,2 500～3 200 cm-1处羧基的ν_O—H峰也消失,出现了羧酸盐特有的反对称伸缩振动吸收峰(ν_as(CO-₂))和对称伸缩振动吸收峰(ν_s(CO-₂)),且Δν(ν_as(CO-₂)-ν_s(CO-₂))与钠盐的Δν相近,说明羧酸根与Eu3+以对称双齿桥式配位。在1H NMR中,形成配合物后第一配体苯环上的质子峰变为宽峰且移向高场,Phen和TPPO中质子化学位移移向低场。室温下测定了配合物的荧光激发光谱和发射光谱,激发光谱表明配合物EuL₃(H₂O)₆,EuL₃Phen(H₂O)₄和EuL₃(TPPO)(H₂O)₅的最佳激发波长分别为353.0,355.0和357.0 nm;发射光谱均显示Eu3+离子的特征发射光谱,且表明Phen对Eu3+离子的荧光发射有明显增强作用。     

萘甲酸功能化的聚苯乙烯与Eu(Ⅲ)离子所形成的高分子-稀土配合物的荧光发射特性

通过大分子反应将萘甲酸(NA)键合在聚苯乙烯(PS)侧链, 制得萘甲酸功能化的聚苯乙烯PSNA。 以PSNA为大分子配基, 以邻菲罗啉(Phen)为小分子配体, 与Eu(Ⅲ)离子配位, 分别制备了高分子-稀土二元发光配合物PS-(NA)₃-Eu(Ⅲ)与高分子-稀土三元发光配合物PS-(NA)₃-Eu(Ⅲ)-Phen。 采用红外光谱(FTIR)和紫外吸收光(UV)谱对配合物进行了表征, 深入研究了配合物的化学结构与发光性能的关系, 并应用Antenna效应理论, 从微观机理上进行了深入分析。 制备了配合物的固体薄膜, 考察了固体薄膜的荧光发射性能。 研究结果表明, 大分子配基PSNA与Eu(Ⅲ)离子所形成的二元或三元高分子-稀土配合物, 均能发射出很强的Eu(Ⅲ)离子的特征荧光, 即键合在PSNA侧链的配基NA能有效地敏化Eu(Ⅲ)离子的荧光发射。 大分子侧链的萘甲酸配基比苯甲酸配基对Eu(Ⅲ)离子荧光发射具有更强的敏化作用。 第二配体的协同配位效应导致三元配合物的荧光发射强度高于二元配合物。