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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.

Two cobalt(II) complexes viz. CoCl2{PPh2(p-C6H4NMe2)}2 (C1) and CoCl2(PPh2Py)2 (C2) were synthesized by reacting CoCl2·6H2O and 4-(dimethylamino)phenyldiphenylphosphine and diphenyl-2-pyridylphosphine ligands, respectively. The complexes were characterized by elemental analysis, FT-IR, UV-visible and electronic spin resonance (ESR) spectroscopic technique. Both the complexes were found stable at room temperature. EPR measurements and UV-visible spectra analysis of C1 and C2 are consistent with a tetrahedral Co(II) and tetragonally distorted octahedral Co(II) ions, respectively.

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