Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India.
Dalton Trans. 2011 Dec 14;40(46):12510-8. doi: 10.1039/c1dt10157a. Epub 2011 Oct 11.
Highly ordered 2D-hexagonal mesoporous silica has been functionalized with 3-aminopropyltriethoxysilane (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 (13)C 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, α-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.
高度有序的二维六方介孔硅已用 3-氨丙基三乙氧基硅烷（3-APTES）功能化。接下来，它与二醛，4-甲基-2,6-二甲醛基苯酚缩合，生成固定化席夫碱配体（I）。将该材料分别用甲醇溶液的氯化铜（II）和氯化镍（II）处理，得到铜和镍锚定的介孔材料，分别命名为 Cu-AMM 和 Ni-AMM。通过傅里叶变换红外（FT-IR）和紫外可见漫反射（DRS）光谱、粉末 X 射线衍射（XRD）、透射电子显微镜（TEM）、N2吸附-解吸研究和（13）C CP MAS NMR 光谱对材料进行了表征。金属接枝介孔材料已用作催化剂，在叔丁基过氧化氢（TBHP）作为氧化剂存在下，在温和的液相条件下，有效地将环己烯、反式二苯乙烯、苯乙烯、α-甲基苯乙烯、环辛烯和降冰片烯选择性环氧化为相应的环氧化物。
