OICC Press Iranian Journal of Catalysis 2345-4865 13 2 2023 11 17 The use of recyclable magnetic nanocatalyst Fe3O4@SiO2-(CH2)3-Pyridine-2-(1H)-tetrazole-Cu(II) in the synthesis of bis-coumarin derivatives under green conditions 10.30495/ijc.2023.1982870.2000 EN Ali Oji Moghanlou Department of Chemistry, Ardabil Branch, Islamic Azad University, Ardabil, Iran, 56157-31567 0000-0001-6134-485X Mohammadali Pourshahi Department of Chemistry, Ardabil Branch, Islamic Azad University, Ardabil, Iran, 56157-31567 0000-0002-3621-5359 Siamak Atabak Department of Chemistry, Ardabil Branch, Islamic Azad University, Ardabil, Iran, 56157-31567 0009-0006-2983-2486 Nayer Mohammadian Tarighi Department of Chemistry, Ardabil Branch, Islamic Azad University, Ardabil, Iran, 56157-31567 0000-0002-2541-9268 Journal Article 2023 11 17 In the present work, first, magnetic nanoparticles (MNP) were synthesized, and a layer of silica was placed on the magnetite nanoparticles through the reaction with TEOS. Next, the pyridine-2-(1H)-tetrazole ligand was fixed on the core-shell magnetite nanoparticles, and finally, the nanocatalyst copper complex was synthesized. The synthesized copper (II) complex of magnetic nanocatalyst was identified through different analyses such as FT-IR, SEM, EDX, XRD, VSM, BET, and atomic absorption. After characterizing the nanocatalyst Fe3O4@SiO2-(CH2)3-Pyridine-2-(1H)-tetrazole-Cu(II), by applying this catalyst in the reaction of benzaldehyde with 4-hydroxycoumarin, the reaction conditions such as solvent type, reaction temperature and The amount of catalyst was optimized. Ethanol was chosen as the optimal solvent as an environmentally friendly solvent. The recycling cycle of the magnetic catalyst was also studied, and the slight decrease in the catalyst's efficiency after six times reactions indicates the high efficiency of this nanocatalyst in the synthesis reaction of bis-coumarin derivatives as a green catalyst.