Synthesis and Catalytic Application of Bimetallic and Trimetallic Magnetic Nanoalloys for the Preparation of Bis(indolyl)methanes

Some bimetallic and trimetallic magnetic nanoalloys based on cobalt, copper, and silver have been synthesized and used as and green catalysts for the preparation of bis(indolyl)methanes through electrophilic substitution reaction of indole with carbonyl compounds. The obtained nanoalloys retained their catalytic activity after several reaction cycles. Rietveld analysis of the X-ray powder diffraction patterns revealed the expected Co11.05Cu20.08Ag68.87 ratio in the Co–Cu–Ag nanoalloy.