A novel coordination complex based on amidine-functionalizedpolyacrylonitrile fiber/copper (I) : A recyclable solid acid catalyst for clickreaction

In this research, a novel modified polyacrylonitrile fiber with an amidine functional group asan effective platform for stabilization of homogeneous active catalytic species of copper (I)iodide was prepared and its utilization as a recyclable heterogeneous catalyst for Click reactionsfor the first time. During this study, a new heterogeneous catalyst of copper (I) fixed onpolyacrylonitrile fiber was designed by two-step rooting of amine ligands and two-toothedamidine ligands in the surface layer of existing commercial polyacrylonitrile fiber(PANFEA/CuI). Amidine groups in functionalized fibers were used to stabilize copper (I) ionsbybonding these ions with amidine two-binding electron donor ligands then evaluate thecatalyticactivity of the resulting two catalysts respectively in Click multi-componentreactionwere studied. Fibers from different stages are identified and by X-raydiffraction (XRD), infraredspectroscopy (FT-IR), solid ultraviolet spectroscopy, CHN elementalanalysis, scanning electronmicroscopy (SEM) and optical microscopy (OM) techniques. The capacity of heterogeneouscatalyst (mmol/g of catalytic species using EDX and ICP techniques. The PANFEA/CuI systemeffectively catalyzes the one-pot three-component Click reactions of halides, azides, and alkynesand selectively produces the ۱,۴-isomer ۱,۲,۳-triazole with high yield in water under mildconditions for ۲-۴ min. The PANFEA/CuI system was successfully recycled up to five timeswithout reducing its catalytic efficiency and selectivity. The XRD pattern of the recycled catalystafter five times used in the model reaction shows that the fibrous structure of the catalyst ispreserved. Cheapness, ease of separation and purification process, recyclability and reuse, andlow leaching of catalytically active particles are prominent features of this new greenenvironmentally friendly catalysts.