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Design and characterization of Fe 3 O 4 /GO/Au‐Ag nanocomposite as an efficient catalyst for the green synthesis of spirooxindole‐dihydropyridines
Author(s) -
Kavyani Sara,
Baharfar Robabeh
Publication year - 2020
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5560
Subject(s) - nanocomposite , chemistry , raman spectroscopy , thermogravimetric analysis , graphene , catalysis , fourier transform infrared spectroscopy , scanning electron microscope , transmission electron microscopy , chemical engineering , nuclear chemistry , nanotechnology , analytical chemistry (journal) , organic chemistry , materials science , composite material , physics , engineering , optics
A novel magnetic nanocomposite of Au‐Ag nanoparticles anchored on Fe 3 O 4 /graphene oxide spheres (Fe 3 O 4 /GO/Au‐Ag) was successfully fabricated by the layer‐by‐layer assembly technique. The prepared Fe 3 O 4 /GO/Au‐Ag was fully characterized by Fourier‐transform infrared (FT‐IR) spectroscopy, X‐ray diffraction (XRD) analysis, thermogravimetric analysis (TGA), field‐emission scanning electron microscopy (FE‐SEM), energy‐dispersive x‐ray spectroscopy (EDS), transmission electron microscopy (TEM), and Raman spectroscopy. This nanocomposite showed unique catalytic performance for the synthesis of Spiro[indoline‐3,5′‐pyrido[2,3‐ d :6,5‐ d ’]dipyrimidine]‐pentaone derivatives by the three‐component condensation reaction of isatins, barbituric acids and 6‐amino uracil at room temperature and in aqueous media. The significant advantages of this protocol include highly stable, easily separable and reusable catalyst, simple operation, environmental friendliness and excellent yields.