Immobilization of a copper-Schiff base complex in a Y-zeolite matrix: Preparation, chromogenic behavior and catalytic oxidation

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• 作者：Pratap Kumar Saha ; Buddhadeb Dutta ; Sreyashi Jana ; Rajesh Bera ; S ; ip Saha ; Ken-ichi Okamoto ; Subratanath Koner
• 关键词：Heterogeneous catalysis ; Catalytic oxidation ; Zeolite ; Immobilization ; Schiff base
• 刊名：Polyhedron
• 出版年：2007
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：10 February 2007
• 卷：26
• 期：3
• 页码：563-571
• 文件大小：412 K

摘要

A new zeolite-immobilized hybrid catalyst Cu(MeO-salen)-NaY has been prepared by encapsulating [Cu(MeO-salen)(H₂O)] (1) [where MeO-salenH₂ = N,N′-(ethylene)-bis-(3-methoxysalicylaldimine)] in a NaY zeolite matrix. The hybrid material has been characterized by UV–Vis, IR and EPR spectrometry and by X-ray powder diffraction analysis. The pristine complex [Cu(MeO-salen)(H₂O)] (1) has also been synthesized and characterized by all the spectrometric methods mentioned above as well as by single crystal X-ray diffraction analysis. A brilliant color change (green to red) has been observed when the complex [Cu(MeO-salen)(H₂O)] (1) is immobilized in the zeolitic matrix. X-ray powder diffraction analysis of Cu(MeO-salen)-NaY reveals that the structural integrity of the mother zeolite in the hybrid material remains intact upon immobilization of the complex. The coordination geometry around the Cu^II ion in [Cu(MeO-salen)(H₂O)] is found to be square pyramidal. Spectroscopic studies indicate that coordination geometry of the complex undergoes a significant distortion when it is entrapped in the zeolite cavity. While Cu(MeO-salen)-NaY shows excellent catalytic activity and product selectivity in the hydroxylation of phenol and 1-naphthol, [Cu(MeO-salen)(H₂O)] (1) remains virtually catalytically inactive in these reactions.