Preparation and characterization of luminescent cubic MCM-48 impregnated with an Eu3+ β-diketonate complex
Preparation and characterization of luminescent cubic MCM-48 impregnated with an Eu3+ β-diketonate complex
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DOI：
10.1016/j.micromeso.2003.07.002
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发表时间：
2003-11-04
影响因子：
5.2
通讯作者：
Mahiou, R
中科院分区：
文献类型：
--
作者：
Meng, QG;Boutinaud, P;Mahiou, R
报道了铕配合物Eu（DBM）（3）激活的发光硅介孔分子筛（MCM-48）的制备。2 H（2）O（其中DBM =二苯甲酰甲烷）。不同浓度的Eu（DBM）（3）。2 H（2）O引入到MCM-48的立方结构中，并将所得样品用乙醇洗涤不同的时间。UV-Vis吸收测量和热重分析被用来估计的量的Eu配合物已被纳入的MCM-48主机的孔内。通过X射线粉末衍射（XRD）、红外光谱、漫反射光谱（DR）和荧光光谱等测试手段对样品进行了表征。结果表明，Eu配合物已成功地引入到MCM-48的孔中，而不会破坏其结构。在紫外灯激发下，所有样品均显示出典型的Eu ~（3+）红色发光。在DR和荧光激发光谱中观察到的吸收最大值的位移，并将讨论与有机复合物和二氧化硅基质之间的宾主相互作用。测量并讨论了不同样品中铕发光的衰减曲线。(C)2003年爱思唯尔公司All rights reserved.
We report on the preparation of luminescent silica mesoporous molecular sieves (MCM-48) activated by the europium complex Eu(DBM)(3) . 2H(2)O (where DBM = dibenzoylmethane), using a simple wet impregnation method. Different concentrations of Eu(DBM)(3) . 2H(2)O were introduced into the MCM-48 cubic structure, and the resulting samples were washed with ethanol for different times. UV-Vis absorption measurements and thermogravimetric analysis were used to estimate the amount of Eu complex that has been incorporated within the pores of the MCM-48 host. The various samples were characterized by X-ray powder diffraction (XRD), infrared spectroscopy, diffuse reflectance (DR) and fluorescence measurements. The results reveal that Eu complexes have been successfully introduced into the pores of MCM-48 without disrupting the structure. All the impregnated MCM-48 materials show the typical red luminescence of Eu3+ when excited with a UV lamp. Shifts of the absorption maxima were observed in the DR and fluorescence excitation spectra and will be discussed in relation with guest-host interactions between the organic complex and the silica matrix. The decay profiles of the europium luminescence in the different samples were also measured and discussed. (C) 2003 Elsevier Inc. All rights reserved.