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Imidazoles are one of the keys of N‐heterocycle molecules that exist in the structure of many biomolecules. In this research project, we reported that Fe3O4@BisImid−CuBr nanocomposite is an attractive and efficient nanomagnetic catalyst to afford 2,4,5–triaryl imidazoles through reactions of 1,2–diketones and aldehydes in the presence of NH4OAc under ecofriendly conditions. The Fe3O4@BisImid−CuBr nanocomposite was readily fabricated by a simple method from available reagents and its structure was analyzed by spectroscopic techniques. SEM and TEM images affirmed the formation of particles in spherical shape and nanometer–size. Under this methodology, a diverse library of triaryl imidazoles were afforded with high yields in water. This synthetic methodology has significant features such as (a) high yields and high purity of the products (b) suitable reaction time (c) use of magnetic reusable nanocatalyst (d) high reusability of Fe3O4@BisImid−CuBr nanocatalyst and the performance of reactions in aqueous medium. [ABSTRACT FROM AUTHOR]

In this research, graphitic carbon nitride (g–C 3 N 4)–cobalt ferrite (CFO) and g–C 3 N 4 – Ca, Mg codoped CFO composite with and without ZnO nanoparticles were fabricated by a combination of hydrothermal and freeze-drying methods. The effects of CFO nanoparticles to graphitic carbon nitride (carbon azide or g-C 3 N 4) nanosheets weight ratio on the microstructure, phase evolution, magnetic, and electromagnetic (EM) behavior of g–C 3 N 4 – CFO–ZnO nanocomposite were investigated. The results revealed Ca-, and Mg-codoped CoFe 2 O 4 nanoparticles were obtained by the green synthesis method. Moreover , as-prepared g–C 3 N 4 – CFO–ZnO nanocomposite had lamella structures. The sample prepared with Ca-, Mg-codoped CFO: g-C 3 N 4 = 2:1 with an effective thickness of 10 mm absorbed more than 90% of EM waves in both the X-band (frequency 8.2–12.4 GHz) and Ku-band (12.4–18 GHz). Finally, the proposed mechanism of EM absorption was suggested. Finally, the effect of ZnO nanoparticles on the EM wave behavior of g–C 3 N 4 – CFO nanocomposite was investigated. [Display omitted] • Synthesis of carbon azide decorated with CFO and ZnO nanocomposite. • Green synthesized CFO nanoparticles increased total magnetization. • Green synthesized g–C 3 N 4 – CFO–ZnO nanocomposite improved EM reflection loss. [ABSTRACT FROM AUTHOR]