A Novel Approach for Preparation of Acetylacetonate Complex Anchored to High Order Nanoporous Silica (LUS-1)

Tris(3-bromo-acetylacetonato) chromium(iii) as an inert and very stable complex with a good leaving group was synthesized using as-prepared cr(acetylacetonate)3. highly ordered nanoporous silica (lus-1), with some great features, was functionalized with 3-aminopropyltriethoxysilane. then the as-prepared product was modified with tris(3-bromo-acetylacetonato) chromium(iii) under mild reaction condition. results obtained from n2 adsorption desorption, and x-ray powder diffraction proved the successful anchoring of the cr(iii) complex inside the pores of lus-1 without any distortion in the structure. the morphology and configuration of lus-1 with scanning electron microscope and transmission electron microscopy and energy-dispersive x-ray spectrum of the product were prepared. mid and far infrared spectroscopy confirmed that the product was possibly an amine, formed by substitution addition of nh2 group on lus-1, to c-br in acac ligands and not a weak and non-stable schiff base. thermal stability of the species was assessed by thermogravimetric analysis. this novel method resulted in the formation of a stable covalently bonded acetylacetonate to the support that it can be used in acidic media or even in polar solvents without altering the structure.