An efficient one-pot synthesis of 1,4-disubstituted 1,2,3-triazoles at room temperature by green synthesized Cu NPs using Otostegia persica leaf extract

• Green synthesis of Cu NPs using aqueous extract of the Otostegia persica leaves.
• The Cu NPs were characterized by TEM, FT-IR, UV–vis and XRD.
• The synthesized Cu NPs by this method are quite stable and can be kept for one month.
• One-pot synthesis of 1,4-disubstituted 1,2,3-triazoles in EtOH at room temperature.

In this study, copper nanoparticles (Cu NPs) were synthesized using a rapid, single step and completely green biosynthetic method by reduction of CuCl2·2H2O solution with aqueous extract of leaves of Otostegia persica containing flavonoid and other phenolics as a main factor which acts as reducing agent and efficient stabilizer. UV–vis spectra gave surface plasmon resonance (SPR) at 560 nm. The Cu NPs were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). A possible synthesis mechanism of Cu NPs was presented. In addition, we investigated the catalytic activity of Cu NPs for the one-pot synthesis of 1,4-disubstituted 1,2,3-triazoles under mild reaction conditions with good to excellent yields. The catalyst could be easily recovered by centrifugation and reused at least five recycles with no significant decreases in the yields.

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