Despite various methods for preparation of tetrazoles, they are suffering from some disadvantages such as low yield, long reaction times and harsh reaction conditions, and there are still high demands to improve the common procedures to solve problems. So, the new copper nanocatalyst was prepared by coating of the Fe 3 O 4 magnetic nanoparticles with tetraethyl orthosilicate, functionalization with 3-chloropropyltrimethoxysilane and 3-mercapto-1,2,4-triazole ligands as well as the subsequent complexation with CuCl 2 . The obtained catalyst was then characterized by different methods (ICP, XRD, EDX, SEM, TEM, TG-DTA and VSM) and applied as a heterogeneous nano-catalyst for the synthesis of diverse tetrazoles from the reaction of various aromatic amines with sodium azide and triethyl orthoformate in solvent-free condition at 100°C in good to high yields.ARTICLE HISTORY

A new magnetic supported manganese-based coordination complex (Fe3O4@SiO2@CPTMS@MBOL@ Mn) was prepared in consecutive stages and characterized via various techniques (VSM, SEM, TEM, XRD, FT-IR, EDX, TG-DTA, and ICP). To evaluate its application, it was used for synthesis of divers Indazolophthalazinetriones in a simple procedure via the one-pot three-component condensation reaction of aldehydes, dimedone, and phthalhydrazide in ethanol under reflux conditions. The Mn catalyst can be recycled without any noticeable loss in catalytic activity. Additionally, the antibacterial properties of the nano-catalyst were studied against some bacterial strains.

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The Pd complex immobilized on the functionalized polymeric support was prepared by the functionalization of the 4-(benzyloxy)benzyl chloride polymer with 5-phenyl-1-H-tetrazole and the subsequent complexation with PdCl 2 .Then, it was characterized with different methods and used as catalyst in the green benzylation reaction of various aryl cyanamides with benzyl bromide and K 2 CO 3 in EtOH at 60 C for the appropriate times. Also, the antibacterial properties of the Pd polymer-supported complex were studied against a number of gram-positive and gram-negative bacteria, and in some cases, it has the same effect as a tetracycline standard antibiotic against Bacillus thuringiensis (a gram-positive bacterium) and Serratia marcescens (a gram-negative bacterium).