resumo
A novel periodic mesoporous organosilica (PMO) material was synthesized through one-step co-condensation of 1,2-bis(triethoxysilyl)ethane (BTESE) and benzoic acid-functionalized organosilane (BA-Si) using cetyltrimethylammonium bromide (CTAB) as a structure-directing agent under basic conditions. The materials were fully characterized by FTIR, XRD, N(2) adsorption-desorption isotherms and FESEM. FTIR spectra proved that BA-Si was successfully incorporated into the PMO materials (PMOs) via benzyl group as a linker. XRD and N(2) adsorption-desorption isotherms revealed the characteristic mesoporous structure with highly uniform pore size distributions. FESEM confirmed that the morphology of the PMOs was significantly dependent cri the molar ratio of two organosilica precursors. In addition, BA-PMO was attempted as a Supporter to link the Tb(3+) ions via impregnation of TbCl(3) into BA-PMO through a ligand exchange reaction. The obtained material Tb-BA-PMO was also characterized. The result showed that the mesostructure of the sample remained intact. Under the UV radiation, the sample exhibited the characteristic strong emission of Tb(3+) ions. In contrast with the pure complex, the resulting hybrid material was demonstrated to presented better thermal stability, demonstrated by thermogravimetric analysis. (C) 2008 Elsevier Inc. All rights reserved.
palavras-chave
INTRAMOLECULAR ENERGY-TRANSFER; BETA-DIKETONATE COMPLEX; ION EXCHANGE METHOD; LUMINESCENCE PROPERTIES; TERBIUM-COMPLEX; ORGANIC GROUPS; LARGE-PORE; SILICA; MCM-41; SIEVES
categoria
Chemistry; Science & Technology - Other Topics; Materials Science
autores
Guo, XM; Guo, HD; Fu, LS; Zhang, HJ; Deng, RP; Sun, LN; Feng, J; Dang, S
nossos autores
Lianshe Fu
Investigador Auxiliaragradecimentos
This project is financially supported by the National Natural Science Foundation of China (Grant Nos. 20490210, 206301040 and 20602035) and the MOST of China (Grant Nos. 2006CB601103, 2006DFA42610). L.S.F. thanks Fundacao para a Ciencia e Tecnologia (FCT, Portuguese agency) for financial support of this research.