A new copper(II) complex supported onto rice-husk-derived nanosilica was prepared from 2,6-bis((phenylselanyl)methyl)pyridine, salicylaldehyde and copper acetate monohydrate, Cu(OAc)₂·H₂O. The as-synthesized complex Cu(II)SeNSe@imine-nanoSiO₂ (Complex I) was extensively characterized with FT-IR, powder XRD, SEM-EDX, solid-state UV-Vis, ESR, XPS, TGA and BET surface area analysis. The catalytic activity of the complex was explored for alcohol oxidation reactions using H₂O₂ as oxidant and acetonitrile as solvent. For comparison, we have also prepared an analogous homogeneous catalyst (Complex II) and characterized it with FT-IR, UV-Vis, LC-MS and ESR analyses. Its catalytic activity was also screened to the same reaction. The immobilized catalyst showed better efficiency with 75%–95% isolated yield compared with the homogeneous one for alcohol oxidation with at least five times recyclability without profound loss in activity.

中文翻译：

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生物衍生的纳米二氧化硅锚定的铜（II）-有机硒配合物作为一种有效的可回收乙醇氧化催化剂

以2,6-双((苯基硒基)甲基)吡啶、水杨醛和一水乙酸铜Cu(OAc) ₂ ·H ₂ O为原料，制备了负载在稻壳衍生纳米二氧化硅上的新型铜(II)配合物。通过FT-IR、粉末XRD、SEM-EDX、固态UV-Vis、ESR、XPS、TGA和BET表面积分析对合成的Cu(II)SeNSe@亚胺-纳米SiO ₂ ( Complex I )进行了广泛表征。以H ₂ O ₂为氧化剂，乙腈为溶剂，研究了配合物对醇氧化反应的催化活性。为了比较，我们还制备了类似的均相催化剂（复合物 II）并通过 FT-IR、UV-Vis、LC-MS 和 ESR 分析对其进行表征。对同样的反应也筛选了其催化活性。与用于醇氧化的均相催化剂相比，固定化催化剂表现出更好的效率，分离产率为 75%–95%，具有至少 5 倍的可回收性，而活性没有显着损失。