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[Display omitted] • Preparation of palladium complex stabilized on nanomagnetic lignin. • C-N coupling reaction was performed in a short time. • The catalyst shows excellent activity and generality in C-N coupling reaction. • Catalyst can be recovered and reused several times without any meaningful decrease in the catalytic activity. The present work describes the preparation of a palladium catalyst using 5-(methylthio)-1 H -tetrazole (Thio-Tet) as a ligand and 3-chloropropyltrimethoxysilane ((MeO) 3 Si-PrCl) as a linker, which was adsorbed onto nanomagnetic lignin (Fe 3 O 4 @LS)-Thio-Tet-Pd(II)). The resulting nanocatalyst (Fe 3 O 4 @LS-thio-Tet-Pd(II)) was successfully applied for the synthesis of arylaminotetrazoles via N -arylation of 5-amino-1 H -tetrazole (5-AT) with aryl iodides. Fe 3 O 4 @LS-thio-Tet-Pd(II) was characterized using FT-IR (Fourier transform-infrared spectroscopy), XRD (X-ray diffraction), EDS (energy dispersive X-ray spectroscopy), VSM (vibrating sample magnetometer), SEM (scanning electron microscope), TEM (transmission electron microscopy), ICP-AES (Inductively coupled plasma atomic emission spectroscopy) and tetrazoles derivatives were analyzed using FT-IR and NMR techniques. The results demonstrated that the catalyst can be recycled five times without any significant decrease in catalytic efficiency, confirming its robustness. [ABSTRACT FROM AUTHOR]

[Display omitted] • Novel Cu(II)-5-amino-1 H -tetrazole complex on the surface of magnetic graphene oxide was prepared. • Characterization of catalyst by FT-IR, XRD, VSM, TG-DTG, EDS, FFT, TEM, HRTEM, STEM, and elemental mapping. • The catalyst was used for the synthesis of N -benzyl- N -aryl-5-amino-1 H -tetrazoles. • The catalyst can be reused five times without remarkable losSupps of catalytic activity. In this study, a new approach has been developed for the synthesis of a novel catalyst based on Cu(II)-5-amino-1 H -tetrazole complex immobilized on the surface of graphene oxide-modified magnetic nanoparticles (GO/Fe 3 O 4 @Tet-Cu(II)) by 3-chloropropyltrimethoxysilane ((MeO) 3 Si-PrCl) as a linker. The synthesis of GO/Fe 3 O 4 @Tet-Cu(II) was confirmed by FT-IR (Fourier transform-infrared spectroscopy), XRD (X-ray diffraction), VSM (Vibrating sample magnetometer), TG-DTG (Thermogravimetry and differential thermogravimetry), EDS (energy dispersive X-ray spectroscopy), elemental mapping, and TEM (transmission electron microscopy). GO/Fe 3 O 4 @Tet-Cu(II) showed high catalytic activity in the synthesis of N -benzyl‐ N ‐aryl‐5‐amino‐1 H ‐tetrazoles via the reaction of N -benzyl- N -arylcyanamides and NaN 3 in DMF solvent at 120 °C in a short reaction time with good yields. The catalyst can be recycled for five runs without losing its efficiency and demonstrates excellent chemical stability and high potential for practical synthetic applications. N -Benzyl‐ N ‐aryl‐5‐amino‐1 H ‐tetrazoles were characterized using FT-IR and NMR analyses. The present strategy could help design and synthesize future catalysts for organic synthesis. [ABSTRACT FROM AUTHOR]