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In this paper, we report a novel magnetically separable silica coated copper nano-magnetite NHC-benzimi@Cu complex as heterogeneous catalyst for the multicomponent click reaction via Huisgen 1,3-dipolar cycloaddition reaction of alkyl or aryl halide, sodium azide and terminal alkyne, which affords various1,4-disubstituted 1,2,3-triazoles. The multistep prepared nano catalyst has been characterized by various spectroscopic methods such as FT-IR, TGA, EDX, XRD, TEM and VSM. The heterogeneous nano catalyst structures coated on the copper surface are responsible for the excellent catalyst performances in the reaction. The reusability of the catalyst makes the present protocol more fascinating from an environmental and economic point of view.Graphic Abstract

A novel nano-Fe3O4 supported Bronsted acidic ionic liquid ([nano-Fe3O4@BenzImi]SO3H) has been prepared by multi-step procedure and characterized by various analytical techniques. The [nano-Fe3O4@BenzImi]SO3H has been employed as a heterogeneous catalyst in the multi-component synthesis of dihydro-1H-pyrazolylnaphthalene-1,4-diones in high yields using ethanol as a green solvent. The [nano-Fe3O4@BenzImi]SO3H could be recycled up to seven catalytic cycles without a significant decrease in the yield of the products.