Biogenic Ag-nanoparticles as heterogeneous catalyst for synthesis of 2-aryl benzimidazoles at room temperature
A green, straightforward and rapid method of synthesizing silver nanoparticles in an aqueous medium has been developed using Syzygium jambos (L.) Alston (Bogi Jamu) leaves extract and aqueous AgNO3 solution. The silver nanoparticles were characterized by UV–vis spectroscopy, transmission electron microscopy, X-ray diffraction and scanning electron microscopy. The results indicate the formation of spherical, nano-sized particles, with average particle size of 20 nm based on TEM analysis. The Ag-nanoparticles efficiently catalyze the synthesis of 2-substituted benzimidazoles by the reaction of aldehydes with o-phenylenediamine in DMSO at room temperature. Simple workup, mild reaction conditions, low cost, easy separation, and reusability of the catalyst are some advantages of this method.
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