负载型壳聚糖双水杨叉乙二胺合钴配合物的制备及其对乙硫醇的催化氧化

Chitosan Coordinated CoSalen and Its Catalytic Activity in Oxidation of Ethanethiol

制备了二氧化硅担载的壳聚糖 Co Salen配合物 ,用元素分析 ,红外光谱 ,荧光光谱、X光电子能谱及ESR谱等方法对该配合物的组成和结构进行了表征 .结果表明 ,Co Salen是通过其钴离子与壳聚糖的氨基氮配位形成配合物 ,这种配合物可通过其空着的第六配位点与氧进行可逆性结合、使氧分子活化 .对乙硫醇催化氧化研究表明 ,这种高分子配合物中活性中心的基位隔离效应导致其催化氧化活性远大于相应的小分子配合物本身 .

A silica supported catalyst, CoSalen (Co(Ⅱ) complex of bis(salicylideneethylene diamine)) coordinated with chitosan (SiO 2 CS CoSalen), was prepared. The chitosan film coated on the silica surface was characterized through elemental analysis, IR, fluorescence spectrophotometry, ESR and XPS. It is found that the coordination is realized through binding of N in chitosan with the Co(Ⅱ) in CoSalen complex. Because the site isolation effect present in CS CoSalen may inhibit the formation of dimers and μ oxo dimers of CoSalen, the coordinated CoSalen showed a more efficient activity in the oxidation reaction of ethanethiol than the monomeric complex.