Physicochemical Properties of CuO2 (acac)2 Supported on Functionalized MCM41 Containing Thiourea Ligand

Abstract

A new material is prepared by encapsulating functionalized-MCM41 with 2-hydroxy-2-mercaptopyrimidine (2-thiouracil) and copper acetate monohydrate. The functionalized-MCM41 was first synthesized by using Ludox as silica source and cetyltrimethylammonium bromide (CTABr) as template and was modified via co-condensation method using 3-aminopropyltriethoxysilane (APTES). The surface and textural of synthesized material have been characterized by using X-ray diffraction (XRD), N2 adsorption isotherms, BET surface area measurement, FT-IR, elemental analyzer and scanning electron microscopy (SEM). The low-angle XRD results indicated that the CuO2(acac)-Thio-APS-MCM41has similar XRD pattern as the mesoporous MCM41 although the intensity decreases. For high-angle XRD, the results show the presence of monoclinic CuO at 2θ = 35.3 and 38.6° while N2 adsorption and BET results were revealed that the CuO2(acac)-Thio-APS-MCM41 possessed a good mesoporous structural ordering and uniform mesoporosity. FTIR spectra confirmed that the organosilane group still retained in the pore channel of the CuO2(acac)-Thio-APS-MCM41 even after modification and the band of C=S and Cu=O also appeared in CuO2(acac)-Thio-APS-MCM41 spectra with the presence of thiourea ligand and copper. Hence, the characterization results were revealed that the synthesized material has an ordered hexagonal structure, a narrow pore size distribution, a high surface area and thiourea complex were successfully grafted onto the pores of functionalized-MCM41

Preparation and characterization of novel phthalhydrazide-functionalized MCM-41 and its application in the one-pot synthesis of coumarin-fused triazolopyrimidines

“…MCM-41 (1 g), 3-chloropropyl trimethoxysilane (5 mmol), and dry toluene (10 mL) were added into a round-bottom ask under reux with stirring in an argon atmosphere for 24 h. The result of this reaction was cooled to room temperature, ltered, and then washed with hot toluene. The subsequent product was dried overnight under vacuum at 80 C. 32,33 Immobilization of phthalhydrazide on CPS-MCM-41 CPS-MCM-41 (1 g) was added to a solution of phthalhydrazide (1.5 mmol) in dry toluene and reuxed for 24 h under an argon atmosphere. Then the mixture was ltered and washed with hot ethanol and dried overnight under vacuum to afford phthalhydrazide-MCM-41 (P-MCM-41) as a white powder.…”

“…Then the mixture was ltered and washed with hot ethanol and dried overnight under vacuum to afford phthalhydrazide-MCM-41 (P-MCM-41) as a white powder. 32,33 General procedure for the synthesis of coumarin-fused triazolopyrimidines 4…”