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《Chinese Journal of Luminescence》 2001-03
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Preparation and Characterization of the Nanostructured Material MCM- 41 and the Luminescent Functional Supramolecule with Eu(Phen)_4 as Guest

YIN Wei 1,2 , ZHANG Mai sheng 1, KANG Bei sheng 1 (1. School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou 510275, China; 2. Department of Chemistry, Guangdong Education Institute, Guangzhou 510310, China)  
Nanosized mesoporous molecular sieve MCM 41 was synthesized with tetraethyl orthosilicate (TEOS) as the source of silica and cetyltrimethylammonium bromide (CTABR) as the template under supersonic wave conditions. By means of high resolution transmission electron microscopy (HRTEM), the nanosized MCM 41 was observed which contains  10~40nm spherical balls possessed  2 7nm regular uniform channels. The nanostructured material (NSM) MCM 41 has good dispersibility and its particle diameter is well distributed. The luminescent functional supramolecule MCM 41 Eu(Phen) 4 between the nanosized MCM 41 and Eu(Phen) 4 was prepared in EtOH, and characterized by TEM, XRD, TG, IR and fluorescent spectroscopy. The NSM of MCM 41 Eu(Phen) 4 are  10~40nm spherical balls too. The XRD patterns are similar to the normal crystal of MCM 41. The IR spectra showed that the guest Eu(Phen) 4 is non infrared active and the OH absorptions of the host MCM 41 are specially fine, strong and sharp in the supramolecule system MCM 41 Eu(Phen) 4. The luminescent spectra indicated that an energy barrier (0 395eV) exists in MCM 41 Eu(Phen) 4 preventing infrared radiation (3030cm -1 ) from reaching the guest Eu(Phen) 4 due to shielding effect of the host on the guest. The experimental results also showed that the molecules of Eu(Phen) 4 presenting in the channel of MCM 41 had formed the centers of luminescence, hence the functional supramolecular NSM with strong luminescence under UV excitation was obtained. The transitions 5D 0 → 7F J (J =1,2,3,4,5) of Eu 3+ with peak values 590 4nm, 614 6nm(617 9nm), 653 4nm, 685 4nm and 699 6nm have been observed in which the electric dipole transition, especially, 5D 0 → 7F 2 (617 9nm red), is as stronge as that for the fine powder of Eu(Phen) 4. This work has resulted in a new field of luminescence and a new route to prepare complex luminescent NSM.
【Fund】: 广州市科技重点攻关计划基金项目 ( 2 0 0 0 Z 0 76 0 1);; 北京大学稀土材料化学及应用国家重点实验室基金资助项目
【CateGory Index】: TB383
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