Magnetic inorganic–organic hybrid nanomaterial for the catalytic preparation of bis(indolyl)arylmethanes under solvent-free conditions: Preparation and characterization of H5PW10V2O40/pyridino-Fe3O4 nanoparticles

Authors: Reza Tayebee, Mostafa M. Amini, Nasrin Abdollahi, Azam Aliakbari, Sima Rabiei, Hassan Ramshini

Abstract:
Magnetically separable inorganic–organic hybrid material H₅PW₁₀V₂O₄₀/pyridino-Fe₃O₄ (HPA/TPIFe₃O₄) nanoparticles provide an efficient and economic route for the synthesis of substituted bis(indolyl)methanes by the electrophilic substitution of indole with various aldehydes and ketones under solvent-free conditions with excellent yields in <30 min. This catalyst was prepared by the chemically anchoring H₅PW₁₀V₂O₄₀ onto Fe₃O₄ nanoparticles via the use of N-[3-(triethoxysilyl)propyl]isonicotinamide (TPI) linker. High catalytic activity and ease of recovery using an external magnetic field are additional eco-friendly attributes of this new catalytic system. The catalyst was recycled at least eight times without significant loss of catalytic activity. Characterization techniques such as XRD, SEM, and FTIR for HPA/TPI-Fe₃O₄ verified that the Keggin structure of tungsto-vanadophosphoric acid on the surface of pyridine modified Fe₃O₄ nanoparticles is retained. 

Keywords:
Hybrid material
H₅PW₁₀V₂O₄₀
Fe₃O₄
Magnetic nanoparticles
Bis(indolyl)arylmethane

Published in: Applied catalysis A: General   (Volume 468, Pages 1-474, 5 November 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Magnetic inorganic–organic hybrid nanomaterial for the catalytic preparation of bis(indolyl)arylmethanes under solvent-free conditions: Preparation and characterization of H5PW10V2O40/pyridino-Fe3O4 nanoparticles

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