Preparation and characterization of Vanadium complexes supported on phyllosilicate and investigation of its catalytic properties

Epoxides are intermediates to produce valuable chemicals Such as polymers, pharmaceuticals, food additives, dyestuffs and fragrance compounds which are commonly used in commercial scales [1]. Reduction, rearrangement or ring opening reactions of, epoxides with various nucleophiles convert, epoxides to diols, amino alcohols, allylic alcohols, ketones and polyether’s [2]. They are regularly manufactured by mild oxidation of alkenes which required the presence of metal based catalysts to coordinate and activate the oxidant for selective production of them [1, 3]. An amine-functionalized layered magnesium-phyllosilicate (AMP) was prepared using a direct alkaline co-polymerization method between magnesium chloride and 3-aminopropyltriethoxysilane. The surface of AMP was further reacted with aldehydes (salicylaldehyde) in order to form Schiff base chelating ligands with N-donor groups incorporated in the layer surface. After than the product was reacte with VO (acac) 2 and used them as Heterogeneous catalysts in epoxidation of some alkenes. The optimal conditions for a yield of 95% include 20mg of catalyst, 2ml C2H4Cl2 as solvent and 0.4ml THBH as oxidant at 80 °c after 90 min. The final products were thoroughly characterized by Fourier Transform Infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM) along with Energy Dispersive X-ray (EDX) Spectroscopy, thermo gravimetric and differential thermal analysis (TG/DTA) and X-ray photoelectron spectroscopy (XPS).