کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1337062 | 1500275 | 2013 | 6 صفحه PDF | دانلود رایگان |
Controlled grafting of a copper (II) complex with a Schiff base ligand (LA = N-(salicylaldimine)-(N′-propyltrimethoxysilane)-diethylenetriamine) on a mesoporous MCM-41 type of silica (LUS) was accomplished using a pattering technique to allow a homogeneous distribution of isolated copper sites on the solid using trimethylsilyl groups as dispersing function. XRD patterns suggest that the final material LUS-CuLA exhibits a well-ordered 2D hexagonal structure. Elemental analysis, solid UV–Vis and EPR spectroscopies indicate that the copper (II) coordination sphere is most likely of a 3N1O type with an additional acetate ion as a ligand. Almost all the Cu(II) species grafted on the solid were EPR active (2.6 wt% active species for 2.8 wt% total copper measured from ICP-MS analysis) confirming the presence of monomeric copper species. Preliminary catalytic tests for phenol hydroxylation show that the supported system presents similar activity as the molecular analogue.
Synthesis and characterization of a copper (II) Schiff base complex supported on a mesostructured porous silica of the type MCM-41. Application as heterogeneous catalyst for oxidation reactions.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 64, 12 November 2013, Pages 371–376