Sarkar, Abani (2026) N-Formylation of Amines by a Magnetically Separable Cobalt Nanocatalyst Using CO2 as a C1 Source. Inorganic Chemistry, 65 (5).

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Abstract

Utilizing CO2 for the synthesis of value-added chemicals offers an economically viable route while contributing to reducing greenhouse gas emissions. In this study, three ligands with N2O2 binding sites were designed and used to synthesize mononuclear three cobalt(III) complexes, 1–3, for catalytic activity in the N-formylation reaction. A comparative study was conducted using DMAB as a greener hydrogen donor compared to triethylsilane in the presence of CO2 as a C1 source. All complexes were characterized by UV–Vis, FT-IR, and single-crystal X-ray analysis. Although complex 2 showed the highest activity, all three homogeneous complexes displayed comparable efficiency and were thus employed to develop magnetically separable nanocatalysts for improved recoverability and reusability. Immobilizing the Schiff base complexes onto graphene oxide, Fe3O4, and APTES yielded three magnetically separable GO@Fe3O4@APTES@CoL1/2/3 nanocatalysts. The heterogeneous catalyst obtained from complex 2, i.e., GO@Fe3O4@APTES@CoL2 (GOFeTESCoL2), was catalytically more efficient than the other two. This new heterogeneous magnetically separable nanocatalyst, GOFeTESCoL2, was then characterized by FT-IR, scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, BET analysis, and X-ray photoelectron spectroscopy, which confirmed successful surface modification. GOFeTESCoL2 is magnetically separable and can be reused for six cycles without any loss of catalytic activity or product yield. This reusability offers a cost-effective nonprecious metal-based catalytic approach that minimizes potential reaction losses.

Item Type:	Article
Uncontrolled Keywords:	Amines Catalysts Inorganic carbon compounds Oxides Solvents
Subjects:	Calibration Cell
Divisions:	UNSPECIFIED
Depositing User:	Mr. B. R. Panduranga
Date Deposited:	07 Jul 2026 04:44
Last Modified:	07 Jul 2026 04:44
URI:	https://cimfr.csircentral.net/id/eprint/3037

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