期刊
MATERIALS RESEARCH BULLETIN
卷 46, 期 8, 页码 1197-1201出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2011.04.009
关键词
Nanostructures; Chemical synthesis; X-ray diffraction; Catalytic properties
资金
- National Natural Science Foundation of China [20851002, 21076003]
- National Basic Research Program of China (973 Program) [2009CB930200]
- Academic Human Resources Development in Institutions of Higher Learning under the jurisdiction of the Beijing Municipality [PHR 200907105, 00500054R5005]
A novel synthesis of the functionalized bimodal mesoporous silica with ionic liquid (FBMMs) was performed. After grafting 1-methyl-3-(trimethoxysilyl)propylimidazolium chloride onto the surface of bimodal mesoporous silicas, 1,4-bis(9-O-quininyl)phthalazine ((QN)(2)-PHAL) and K2Os(OH)(4)center dot 2H(2)O were immobilized onto the modified FBMMs by adsorption or ionic exchange methods, and then, the asymmetric dihydroxylation reaction was carried out by using solid catalysts. Techniques such as X-ray diffraction, Fourier Transform Infrared spectroscopy, N-2 adsorption and desorption were employed to characterize their structure and properties. The results showed that the mesoporous ordering degree of bimodal mesoporous silica decreased after functionalization and immobilization of OsO4-(QN)(2)PHAL. Being very effective in asymmetric dihydroxylation with high yield and enantioselectivity, the prepared heterogeneous solid catalyst could be recycled for five times with little loss of enantioselectivity, with comparison of those results obtained in homophase system. Moreover, the effect of Osmium catalyst on asymmetric dihydroxylation was investigated. (C) 2011 Elsevier Ltd. All rights reserved.
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