Abstract
Crystalline hybrid catalysts based on molybdenum or tungsten oxide and aliphatic diamines were synthesized via simple, eco-friendly reproducible methodologies, starting from commercially available and relatively inexpensive organic and inorganic precursors, and using water as solvent under mild conditions. The crystal structures of the obtained fine powdered solids were solved ab initio from powder X-ray diffraction data. The type of organic component (1,2-diaminoethane, 1,2-diaminopropane, 1,3-diaminopropane) may play a structure-directing role. On the other hand, different metals (M = Mo, W) may lead to isostructural one-dimensional hybrids of the type MO3(L) with the same bidentate diamine ligand L. The prepared catalysts were investigated for the liquid phase oxidation of saturated and unsaturated hydrocarbons (cis-cyclooctene, cyclooctane), using different types of oxidants (O2, H2O2, tert-butyl hydroperoxide). Differences in catalytic performances associated with distinct structural features were investigated.Graphic
Highlights
Inorganic–organic polymeric hybrids based on molybdenum and tungsten oxide and diamines, with the general formula {MO3(NH2)2R} where M = Mo,W, have been described in the recent literature [1,2,3,4,5,6]
Routine X-ray powder diffraction (XRPD) data were collected at ambient temperature on a Philips Analytical Empyrean diffractometer equipped with a PIXcel 1D detector, with automatic data acquisition (X’Pert Data Collector software v. 4.2) using monochromatized Cu Kα radiation (λ = 1.54178 Å)
Compounds 1–4 were investigated as catalysts for the liquidphase oxidation of unsaturated and saturated hydrocarbons, in batch mode, using cyclic C8 model substrates, namely ciscyclooctene (Cy) and cyclooctane, facilitating comparisons with literature data reported for different catalysts
Summary
Inorganic–organic polymeric hybrids based on molybdenum and tungsten oxide and diamines, with the general formula {MO3(NH2)2R} where M = Mo,W, have been described in the recent literature [1,2,3,4,5,6] These compounds have attracted considerable attention because of their interesting structural architectures and properties [7, 8]. These types of hybrids possess catalytic activity for saturated hydrocarbons oxidation and olefins epoxidation, which are important chemical reactions [1,2,3, 5, 6]. While isostructural analogues may be obtained by changing the type of metal, the use of different aliphatic diamines may play a structure-directing role
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