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A novel ternary GO@SiO 2 ‐HPW nanocomposite as an efficient heterogeneous catalyst for the synthesis of benzazoles in aqueous media
Author(s) -
Habibzadeh Setareh,
Firouzzadeh Pasha Ghasem,
Tajbakhsh Mahmood,
Amiri Andi Nasim,
Alaee Ehsan
Publication year - 2019
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201800323
Subject(s) - nanocomposite , thermogravimetric analysis , chemistry , phosphotungstic acid , catalysis , chemical engineering , aqueous solution , fourier transform infrared spectroscopy , ternary operation , graphene , oxide , scanning electron microscope , nuclear chemistry , organic chemistry , materials science , composite material , computer science , engineering , programming language
A new solid acid catalyst, consisting of 12‐phosphotungstic heteropoly acid (HPW) supported on graphene oxide/silica nanocomposite (GO@SiO 2 ), has been developed via immobilizing HPW onto an amine‐functionalized GO/SiO 2 surface through coordination interaction (GO@SiO 2 ‐HPW). The GO@SiO 2 ‐HPW nanocomposite was characterized by Fourier transform infrared (FT‐IR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and powder X‐ray diffraction (XRD). The prepared nanocomposite could be dispersed homogeneously in water and further used as a heterogeneous, reusable, and efficient catalyst for the synthesis of benzimidazoles and benzothiazoles by the reaction of 1,2‐phenelynediamine or 2‐aminothiophenol with different aldehydes.