Bio-derived nanosilica-anchored Cu(II)-organoselenium complex as an efficient retrievable catalyst for alcohol oxidation
Funding information: UGC, New Delhi, India
Abstract
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.
Highlights
- This is the first report of immobilized copper complex with Se–N–Se pincer ligand. Moreover, we have used bio-derived nanosilica as a solid support.
- The alcohols are oxidized under environmentally benign mild reaction conditions using hydrogen peroxide as an oxidant.
- The catalytic performance of the supported complex was compared with an analogous unsupported complex.
CONFLICT OF INTEREST
The authors declare that there is no conflict of interest regarding the publication of this article.
Open Research
DATA AVAILABILITY STATEMENT
The data that support the findings of this study are available from the corresponding author upon reasonable request.