共查询到16条相似文献,搜索用时 218 毫秒
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在合成含有8-羟基喹啉(8HOQ)配位基单体的基础上,将其与甲基丙烯酸甲酯(MMA)共聚得到含有8-羟基喹啉侧基的聚甲基丙烯酸甲酯(PMMA8q),实现了8-羟基喹啉的高分子化;通过PMMA8q和小分子协同配体与稀土离子Eu(Ⅲ)的配位反应,制备了两个稀土高分子发光配合物:Eu(PMMA8q)(8HOQ)2(H2O)3和Eu(PMMA8q)2(TTA)(H2O)3(TTA:噻吩甲酰三氟丙酮)。利用元素分析、红外光谱方法对各阶段产物进行了表征,用荧光光谱研究了两个稀土高分子配合物的荧光特性及发光机理。 相似文献
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8-羟基喹啉衍生物及其金属配合物的合成与光致发光特性 总被引:6,自引:0,他引:6
设计合成了三种新型的8-羟基喹啉衍生物配体: 5-[(4-E-苯乙烯基)-苯甲亚胺基]-8-羟基喹啉(1), 5-[(4-溴-2-氟)-苯甲亚胺基]-8-羟基喹啉(2)和N-乙基-3-[2-(8-羟基喹啉基)-乙烯基]咔唑(3), 以及它们相应的金属配合物, 产物经质谱(MS)、元素分析(EA)、红外光谱(IR)、紫外光谱(UV)、核磁共振氢谱(1H NMR)进行表征, 并测定了它们的荧光性质. 结果与8-羟基喹啉比较表明, 5位和2位取代8-羟基喹啉衍生物的荧光发生了明显的红移. 同时测定了配合物(3)2Zn的荧光寿命, 结果表明, N-乙基-3-[2-(8-羟基喹啉基)-乙烯基]咔唑锌配合物表现出较长的荧光寿命. 相似文献
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以4-甲基苯磺酸作催化剂、用三乙胺调节pH值约为9的条件下, 由5-甲酰基-8-羟基喹啉和5-氨基-8-羟基喹啉合成了新的5,7′-(亚甲胺基)-二-8-羟基喹啉, 利用IR, UV, 1H NMR, MS确认了分子结构, 比较研究了其光致发光特性, 运用Gaussian 98量子化学程序包, 采用B3LYP密度泛函(DFT)的方法, 在6-31G(d,p)水平上对分子的几何构型进行结构优化; 并对目标化合物的稳定结构通过计算预测其振动光谱, 计算结果与实验值基本相符. 相似文献
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设计合成了3种8-羟基喹啉衍生物配体:(E)-2-[2-(2-硝基苯基)乙烯基]-8-羟基喹啉(4a),(E)-2-[2-(3-硝基苯基)乙烯基]-8-羟基喹啉(4b),(E)-2-[2-(4-硝基苯基)乙烯基]-8-羟基喹啉(4c)及其相应的锌配合物5a~5c,产物经1H NMR,IR,MS和元素分析技术进行了结构表征.通过紫外滴定模拟了金属锌与配体的配位过程,分别测定了它们固态和溶液状态下的荧光性质:光谱显示化合物5a~5c固体荧光光谱的λmax分别是596,625,592 nm,在DMF溶液中的λmax分别是562,536,618 nm.荧光光谱显示硝基位置的改变可以调控8-羟基喹啉锌配合物的发光性质. 相似文献
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以8-羟基喹啉为原料,合成了5-(烯丙氧)甲基-8-羟基喹啉配体及其铝配合物,并通过红外光谱对配体和配合物进行了表征,通过荧光光谱研究了配合物的光致发光性能。 相似文献
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5,7′-(亚甲胺基)-二-8-羟基喹啉的合成及其理论研究 总被引:2,自引:0,他引:2
以4-甲基苯磺酸作催化剂、用三乙胺调节pH值约为9的条件下,由5-甲酰基-8-羟基喹啉和5-氨基-8-羟基喹啉合成了新的5,7′-(亚甲胺基)-二-8-羟基喹啉,利用IR,UV,1H NMR,MS确认了分子结构,比较研究了其光致发光特性,运用Gaussian 98量子化学程序包,采用B3LYP密度泛函(DFT)的方法,在6-31G(d,p)水平上对分子的几何构型进行结构优化;并对目标化合物的稳定结构通过计算预测其振动光谱,计算结果与实验值基本相符. 相似文献
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We report the synthesis and characterization of monomeric, oligomeric, and polymeric aluminum 8-hydroxyquinolines. The new structures of aluminum quinolate are contrived for expanding the application of AlQ(3) in the area of solution process by modifying AlQ(3) structure for improving solution processibility and crystallization resistance. Oligomeric aluminum 8-hydroxyquinoline (OALQ) was obtained using methylaluminoxane (MAO) and 8-hydroxyquinoline (8-HQ). Polymeric aluminum 8-hydroxyquinoline (PALQ) consists of 8-HQ and a polymeric Al-O backbone, simply prepared by stoichiometrically reacting 8-hydroxyquinoline, pentaerythritol propoxylate, and triethyl aluminum in the presence of chloroform. The absorption and emission spectra of OALQ and PALQ bear a clear resemblance to those of AlQ(3), and the molecular orbitals of OALQ and PALQ are virtually identical to those of AlQ(3). In the SEM images of AlQ(3) and OALQ, cylindrical rods of >100 microm in length and 5-10 microm in diameter for AlQ(3) and 20-100 microm in length and 1-5 microm in diameter for OALQ were observed, respectively. The size of the cylindrical rods of OALQ decreased compared with that of AlQ(3). As for the image of PALQ, an amorphous phase with bulge spots (ca. 5 microm) was observed. These microscope data correspond well to the X-ray powder pattern results. The chemical shifts (31.1, 57.0 ppm) and peak broadness of (27)Al NMR of AlQ(3) and its DFT calculation results present that mer- and fac-AlQ(3) appear in equilibrium through pentacoordinated intermediates. With the combination of DFT optimization and NMR calculation, models of OALQ and PALQ, hexa-, penta-, and tetracoordinated structures, were proposed, which exist in polymeric Al-O backbone and with inter- and intracoordination of Al-O bonds. 相似文献
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A new hexadentate, tripodal 8-hydroxyquinoline ligand (QH3) and its trivalent metal chelates (MQ, M=Al3+, Ga3+, In3+) with hemicage structures have been prepared and the electrochemical and photophysical properties systematically studied. The hemicage structure of the metal complexes was characterized by 1H NMR, indicating a pure facial geometry, in contrast to their uncaged cousins with 8-hydroxyquinoline (Mq3) and 3-methyl-8-hydroxyquinoline (M(3Meq)3), which all exist only as the meridional form in fluid solutions at room temperature. The photoluminescence quantum efficiency for the three hemicage complexes is 1.48, 1.79, and 1.26 times higher for AlQ, GaQ, and InQ, respectively, than their corresponding 3-methyl-8-hydroxyquinoline complexes, likely due to the rigidity of the ligand system, which can efficiently decrease the nonradiative decay of the excited states. The improved electrochemical stability of the hemicage complexes has been demonstrated by cyclic voltammetry, showing an increasingly reversible behavior from InQ to GaQ to AlQ (Ered=-2.15, -2.17, and -2.22 V vs Fc/Fc+ in DMSO). We infer that the degree of reversibility and redox potential result from the metal-ligand bond strength, which is largest in the case of aluminum. 相似文献
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Knox JE Halls MD Hratchian HP Schlegel HB 《Physical chemistry chemical physics : PCCP》2006,8(12):1371-1377
Tris(8-hydroxyquinoline)aluminum(III), AlQ3, is used in organic light-emitting diodes (OLEDs) as an electron-transport material and emitting layer. The reaction of AlQ3 with trace H2O has been implicated as a major failure pathway for AlQ3-based OLEDs. Hybrid density functional calculations have been carried out to characterize the hydrolysis of AlQ3. The thermochemical and atomistic details for this important reaction are reported for both the neutral and oxidized AlQ3/AlQ3+ systems. In support of experimental conclusions, the neutral hydrolysis reaction pathway is found to be a thermally activated process, having a classical barrier height of 24.2 kcal mol(-1). First-principles infrared and electronic absorption spectra are compared to further characterize AlQ3 and the hydrolysis pathway product, AlQ2OH. The activation energy for the cationic AlQ3 hydrolysis pathway is found to be 8.5 kcal mol(-1) lower than for the neutral reaction, which is significant since it suggests a role for charge imbalance in promoting chemical failure modes in OLED devices. 相似文献
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Synthesis and characterization of 5-substituted 8-hydroxyquinoline derivatives and their metal complexes 总被引:1,自引:0,他引:1
Lihua Li 《Tetrahedron》2008,64(49):10986-10995
5-Aminomethyl-8-hydroxyquinoline (QN) was synthesized as a scaffold to generate dimers, trimers, and tetramer metalloquinolates. Starting from QN, a series of 5-substituted 8-hydroxyquinoline derivatives conjugated with small bioactive molecules were synthesized. Absorption and emission spectra indicate that these QN derivatives chelate well with metal ions, which may serve as a new platform to explore the applications of metalloquinolates for a variety of potential applications. 相似文献
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应用密度泛函PBE0方法优化5-[2'-氟-4'-溴-苯甲亚胺]-8-羟基喹啉铝(AlA3)及5-[2'-氟-4'-溴-苯甲亚胺]-8-羟基喹啉(HA)的几何构型, 用TDDFT法计算其电子光谱, 对电荷转移及金属原子与配体的结合能进行了讨论. 计算结果表明: (1) AlA3配合物较稳定, 但结合能略低于8-羟基喹啉铝(AlQ3). 与AlQ3相比, AlA3的轨道作用较强, 静电作用较弱, 两者之和相近, 但AlA3排斥能较大. (2) 计算AlA3的两个电子吸收峰与实验结果相符. AlA3中的电荷由羟基喹啉基团通过Al原子在不同配体间转移呈现出最大吸收峰, 属于AlQ3类衍生物的特征吸收峰. 因为体系的共轭程度增大使LUMO轨道能降低, 电子跃迁需要的能量减少, 故吸收峰比AlQ3红移; (3) 290 nm吸收峰是电荷由CN基团向羟基喹啉基团转移产生的. 在喹啉环接上5-[2'-氟-4'-溴-苯甲亚胺]基团可望制备出波长更长的发光材料, 且增加了一个较强的吸收峰. 相似文献