Journal
DALTON TRANSACTIONS
Volume 40, Issue 46, Pages 12510-12518Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1dt10157a
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- Department of Science and Technology, New Delhi
- Japan Society for the Promotion of Science [21655081]
- Japan Science and Technology Agency (JST)
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Highly ordered 2D-hexagonal mesoporous silica has been functionalized with 3-aminopropyltriethoxy-silane (3-APTES). This is followed by its condensation with a dialdehyde, 4-methyl-2,6-diformylphenol to produce an immobilized Schiff-base ligand (I). This material is separately treated with methanolic solution of copper(II) chloride and nickel(II) chloride to obtain copper and nickel anchored mesoporous materials, designated as Cu-AMM and Ni-AMM,respectively. The materials have been characterized by Fourier transform infrared (FT-IR) and UV-vis diffuse reflectance (DRS) spectroscopy, powder X-ray diffraction (XRD), transmission electron microscopy (TEM), N-2 adsorption-desorption studies and C-13 CP MAS NMR spectroscopy. The metal-grafted mesoporous materials have been used as catalysts for the efficient and selective epoxidation of alkenes, viz. cyclohexene, trans-stilbene, styrene, a-methyl styrene, cyclooctene and norbornene to their corresponding epoxides in the presence of tert-butyl hydroperoxide (TBHP) as the oxidant under mild liquid phase conditions.
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