چكيده فارسي :
Graphene is an exciting material for applied catalyst research because of its distinct properties, such as high surface area, high mechanical strength and electrical conductivity, intrinsic low mass, high water dispersibility, easy surface modifications, and oxygen‒carrying functionalities.1-3In this study, we synthesized and characterized two new graphene‒based catalysts and applied for the aerobic oxidation of various organic compounds. Functionalization of graphene oxide with guanidine lead to uniformly dispersing of CrCoFeO4 and Zn0.5Co0.5Fe2O4 nanoparticles. The distribution of CrCoFeO4 and Zn0.5Co0.5Fe2O4 on the surface of guanidine‒grafted graphene oxide nanosheets gave the active catalytic systems with high catalytic activity and selectivity in the aerobic oxidation of the alkyl arenes and alcohols to the corresponding aldehydes and ketones without any over oxidation. Guanidine‒grafted graphene oxide nanosheets as support for immobilization of CrCoFeO4 and Zn0.5Co0.5Fe2O4nanoparticlesenhance the catalytic activity of the prepared systems in the aerobic oxidation of indane and 1‒indanol due to π–π interaction between graphene support and benzene skeleton of the reactants and consequently the adsorption of aromatic reactants on the surface of G‒GO support. Also, the oxidative synthesis of 2-phenylbenzo[d]oxazole derivativesby employing inexpensive and readily available aromatic hydrocarbons of petroleum naphtha(toluene and three xylene isomers)as aldehyde precursors was catalyzed successfully in the precense of CrCoFeO4@G‒GO and Zn0.5Co0.5Fe2O4@G‒GO catalysts.
