• copper(ii) complexes of arylhydrazones of β-diketones immobilized on zn–al layered double hydroxides as effective recyclable catalysts for peroxidative oxidation of alkanes

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 919
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     new cuii complexes [cu(h2o)(μ-l1)na(h2o)]n·2nh2o (4), [cu(h2o)(μ-hl2)na(h2o)]n·2nh2o (5) and [cu(h2o)(μ-l3)na(h2o)]n·2nh2o (6), bearing the so3 or coo-functionalized arylhydrazones of β-diketones (ahbds) 3-(2-hydroxy-3-sulfo-5-nitrophenylhydrazone)pentane-2,4-dione (h3l11), 3-(2-hydroxy-3,5-disulfophenylhydrazone)pentane-2,4-dione (h4l22) or 1-ethoxy-2-(2-hydroxy-4-carboxyphenylhydrazone)butane-1,3-dione (h3l33), were synthesized and characterized by elemental analysis, ir spectroscopy, esi-ms and x-ray analysis (for 4). 46 were immobilized on the layered double hydroxides (ldh) [zn0.74al0.26(oh)2]ǀ(no3)0.26·0.23h2o and characterized by x-ray powder diffraction patterns (xrpd), uv–vis, ir spectroscopies, thermogravimetric (tg) and differential thermal (dta) analyses. the heterogenized cuiiahbd-ldh systems catalyze the peroxidative oxidation (with tbhp or h2o2 as oxidant) of alkanes (cyclohexane, n-pentane, n-hexane, n-heptane, n-octane) mainly to alcohols, under mild conditions, and can be recycled at least five times without significant loss of activity, with overall yields of 10–15% per cycle depending on the catalyst used. regioselectivity at position 2 of the alkane is favoured by the heterogenized catalysts.

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