A metal-organic framework Cu2(NDC)2(DABCO) was synthesized from copper nitrate trihydrate, 2,6-Napthalenedicarboxylic acid (H2NDC), and 1,4-diazabicyclo[2.2.2]octane (DABCO) by solvothermal method. Its physicochemical properties were confirmed by several techniques such as X-ray powder diffraction (PXRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Cu2(NDC)2(DABCO) appeared as well-shaped crystals. To get diphenyl sulfide as desired product from the C-S cross coupling reaction of iodobenzene and thiophenol, the Cu2(NDC)2(DABCO) was used as heterogeneous catalyst in the presence of LiO-tBu as base. The results showed that the transformation could proceed with more than 93% reaction conversion being obtained after 6 h at 120 oC when using 5 mol% Cu2(NDC)2(DABCO) catalyst in the presence of LiO-tBu. The solid catalyst could be recovered and reused five times without a significant degradation in catalytic activity. The coupling reaction could only proceed to achieve major product in the presence of the Cu2(NDC)2(DABCO catalyst.
This work presents a facile and green method using Citrus aurantifolia fruit extract for the biosynthesis of magnetite nanoparticles (MNs). The effects of some effective parameters such as temperature, reaction time and the ratio of Citrus aurantifolia extract to sodium borohydride on the synthesis were investigated. The synthesized Fe3O4 nanoparticles were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), energy-dispersive X- ray spectroscopy (EDX), transmission scanning electron microscopy (TEM), and vibrating sample magnetometer (VSM). The results showed that the MNs were well-monodisperse with the mean size of 50 nm and superparamagnetism value of 40.1 emu/g. Adsorption of Cr(VI) in aqueous solution at pH 2.5 using MNs reached 94.9% for removal of Cr(VI). The main contribution of this work was the synthesis of MNs in an economical and environmental friendly way, achieving size-controlled MNs at mild conditions. A possible mechanism of MNs synthesis was also presented.
A porous crytalline metal-organic framework Fe3O(BPDC)3 was synthesized, and its properties were characterized by various techniques, including X-ray powder diffraction (PXRD), Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen physisorption measurements. The Fe3O(BPDC)3 was used as an efficient catalyst for the oxidative coupling reaction of benzaldehyde and (E)-1-phenylethan-1-one O-acetyl oxime to form 2,4,6-triphenylpyridine as desired product. The reaction could proceed readily, with more than 83 % reaction yield being achieved after 360 min at 140 oC in the presence of 10 mol% Fe3O(BPDC)3) catalyst and Di-tert-butyl peroxide as an oxidant. This Fe-MOF exhibited higher activity than other MOFs and traditional homogeneous catalysts in the oxidative coupling reaction. The transformation could only proceed to obtain main product in the presence of Fe3O(BPDC)3.
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