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Ultrasonic and bio‐assisted synthesis of Ag@HNTs‐T as a novel heterogeneous catalyst for the green synthesis of propargylamines: A combination of experimental and computational study
Author(s) -
Malmir Masoumeh,
Heravi Majid M.,
Sadjadi Samahe,
Hosseinnejad Tayebeh
Publication year - 2018
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.4291
Subject(s) - catalysis , halloysite , chemistry , leaching (pedology) , heterogeneous catalysis , surface modification , methanol , green chemistry , metal , fourier transform infrared spectroscopy , coupling reaction , nuclear chemistry , nanoparticle , silver nanoparticle , chemical engineering , reaction mechanism , organic chemistry , environmental science , soil science , engineering , soil water
A novel heterogeneous catalyst is prepared through functionalization of halloysite nanotube with 1 H ‐1,2,3‐triazole‐5‐methanol and subsequent immobilization of silver nanoparticles through bio‐assisted approach using Arctiumplatylepis extract. The resulting catalyst, Ag@HNTs‐T, was characterized by using SEM/EDX, BET, XRD, FTIR, ICP‐AES, TGA, DTGA and elemental mapping analysis. Moreover, we computationally assessed metal‐ligand interactions in Ag@HNTs‐T complex model to interpret the immobilization behavior of silver nanoparticles on HNTs surface via quantum chemistry computations. The catalytic activity of the catalyst was studied for the synthesis of propargylamines via A 3 and KA 2 coupling reactions under ultrasonic irradiation. The results demonstrated that Ag@HNTs‐T could efficiently promote these reactions to furnish the corresponding products in high yields and short reaction times. The study of the recyclability of the catalyst and Ag(0) leaching confirmed that the catalyst was recyclability up to four reaction runs with slight Ag(0) leaching.