OICC Press International Nano Letters 2228-5326 10 2 (June 2020) 2020 03 05 Nanoparticles supported graphene oxide and its application as an efficient and recyclable nano-catalyst in the synthesis of imidazole derivatives in ultrasound solvent-free condition 10.1007/s40089-020-00297-8 EN Ali Yavar Karami Department of Applied Chemistry, Faculty of Science, South Tehran Branch, Islamic Azad University, Tehran, IR Mohammadreza Manafi Department of Applied Chemistry, Faculty of Science, South Tehran Branch, Islamic Azad University, Tehran, IR Keivan Ghodrati Department of Chemistry, Kermanshah Branch, Islamic Azad University, Kermanshah, IR Ramin Khajavi Department of Polymer and Textile Engineering, South Tehran Branch, Islamic Azad University, Tehran, IR Mohammad Hojjati Department of Applied Chemistry, Faculty of Science, South Tehran Branch, Islamic Azad University, Tehran, IR Journal Article 2020 03 05 Abstract In this research, GO has been supported by some metal oxide for preparing a novel nano-catalyst. This reusable nano-catalyst has been used for the synthesis of some benzimidazoles from corresponding aldehydes and 1,2-benzenediamine. The reaction condition is simple and the products yield are excellent. The nano-catalyst's structure has been confirmed by FT-IR, scanning electron microscopy, transmission electron microscopy and atomic forced molecule and all heterocycle products have been characterized by FTIR, HNMR, CNMR and their mp were compared by those reported in references.