Palladium nanoparticles immobilized on sepiolite–cyclodextrin nanosponge hybrid: Efficient heterogeneous catalyst for ligand‐ and copper‐free C─C coupling reactions

Sadjadi, Samahe; Heravi, Majid M.; Raja, Maryam; Kahangi, Fatemeh Ghoreyshi

doi:10.1002/aoc.4508

Cited by 15 publications

(12 citation statements)

References 60 publications

(79 reference statements)

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“…The FT-IR spectra of the CDNS, CDNS-N, and Ag@CDNS-N/PMelamine are exposed in Figure 4. The CDNS spectrum is in good agreement with previous reports [40] and showed the characteristic bands at 3400 cm −1 (-OH functionality), 2928 cm −1 (-CH2 groups), and 1700 cm −1 that can be assigned to the ester -C=O functionality, indicating successful cross-linking between the CDs and diphenyl carbonate. The FTIR spectrum of CDNS-N is very similar to that of CDNS.…”

Section: Characterization Of Ag@cdns-n/pmelaminesupporting

confidence: 90%

Ag Nanoparticles Stabilized on Cyclodextrin Polymer Decorated with Multi-Nitrogen Atom Containing Polymer: An Efficient Catalyst for the Synthesis of Xanthenes

et al. 2020

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In attempt to broaden the use of cyclodextrin polymer for catalytic purposes, a novel covalent hybrid system was prepared through growth of multi-nitrogen atom containing polymer (PMelamine) derived from reaction of ethylenediamine and 2,4,6-trichloro-1,3,5-triazine on the functionalized cyclodextrin polymer (CDNS). The resulting hybrid system was then utilized as a catalyst support for the immobilization of silver nanoparticles through using Cuscuta epithymum extract as a naturally-derived reducing agent. The catalytic activity of the catalyst, Ag@CDNS-N/PMelamine, for the synthesis of xanthenes through reaction of aldehydes and dimedone in aqueous media was examined. The results showed high catalytic activity and recyclability of the catalyst. It was believed that cyclodextrin in the backbone of the catalyst could act both as a capping agent for Ag nanoparticles and phase transfer agent to bring the hydrophobic substrates in the vicinity of the catalytic active sites and accelerate the reaction rate. Multi-nitrogen atoms on the polymer, on the other hand, could improve the Ag NPs anchoring and suppress their leaching.

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Section: Characterization Of Ag@cdns-n/pmelaminesupporting

confidence: 90%

Ag Nanoparticles Stabilized on Cyclodextrin Polymer Decorated with Multi-Nitrogen Atom Containing Polymer: An Efficient Catalyst for the Synthesis of Xanthenes

et al. 2020

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“…This result confirms that the tubular structure of Hal does not destroy during the functionalization and stabilization of Pd. Also, the diffraction peaks of Pd NPs were not observed in the sample, affirming the high dispersion of Pd NPs as well as their low loading on the support 35 . This result was confirmed by ICP analysis and the loading of Pd was found to be 0.85 wt%.…”

Section: Resultsmentioning

confidence: 80%

Pd NPs supported on halloysite functionalized with Schiff base as an efficient catalyst for Sonogashira reaction

Daraie

Heravi

Rangraz

et al. 2021

Sci Rep

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A hybrid system was designed and synthesized through reacting modified halloysite (Hal-Cl) with Schiff base (DAB-PC) and applied as catalytic support for anchoring Pd NPs to afford Pd@Hal-DAB-PC catalyst. The resultant material was well identified by various analyses including Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction patterns (XRD), thermogravimetric analysis (TGA), field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and inductively coupled plasma-optical emission spectrometry (ICP-OES) and revealed outstanding catalytic activity in the Sonogashira reaction in aqueous media. Also, This nanocatalyst was simply collected and recycled up to six runs with a slight drop in efficiency, indicating the durability of Pd@Hal-DAB-PC.

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“…In the continuation of research on heterogeneous catalysts based on clays and clay-carbohydrate hybrids 25 – 29 , herein we wish to report a covalent hybrid of sepiolite clay and chitin (CH), Fig. 1 , and its utility as a support for the stabilization of silver nanoparticles with assistance of Kombucha extract as a natural reducing agent.…”

Section: Introductionmentioning

confidence: 99%

Bio-assisted synthesized Ag(0) nanoparticles stabilized on hybrid of sepiolite and chitin: efficient catalytic system for xanthene synthesis

Kahangi

Mehrdad

Heravi

et al. 2020

Sci Rep

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In this work, with the use of two natural compounds, chitin and sepiolite clay, a novel covalent hybrid is fabricated and applied as a support for the stabilization of silver nanoparticles with the aid of Kombucha extract as a natural reducing agent. The resultant catalytic system, Ag@Sep-N–CH, was characterized via XRD, TEM, FTIR, ICP, SEM, TGA, UV–Vis and BET. It was found that fine Ag(0) nanoparticles with mean diameter of 6.1 ± 1.8 nm were formed on the support and the specific surface area of the catalyst was 130 m2 g−1. The study of the catalytic performance of Ag@Sep-N–CH for catalyzing synthesis of xanthenes in aqueous media under mild reaction condition confirmed that Ag@Sep-N–CH exhibited high catalytic activity and could promote the reaction of various substrates to furnish the corresponding products in high yields. Moreover, the contribution of both chitin and sepiolite to the catalysis has been affirmed. It was found that hybridization of these two components led to synergistic effects and consequently improved the observed catalytic activity. Notably, the catalyst was recyclable up to several reaction runs.

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Palladium nanoparticles immobilized on sepiolite–cyclodextrin nanosponge hybrid: Efficient heterogeneous catalyst for ligand‐ and copper‐free C─C coupling reactions

Cited by 15 publications

References 60 publications

Ag Nanoparticles Stabilized on Cyclodextrin Polymer Decorated with Multi-Nitrogen Atom Containing Polymer: An Efficient Catalyst for the Synthesis of Xanthenes

Ag Nanoparticles Stabilized on Cyclodextrin Polymer Decorated with Multi-Nitrogen Atom Containing Polymer: An Efficient Catalyst for the Synthesis of Xanthenes

Pd NPs supported on halloysite functionalized with Schiff base as an efficient catalyst for Sonogashira reaction

Bio-assisted synthesized Ag(0) nanoparticles stabilized on hybrid of sepiolite and chitin: efficient catalytic system for xanthene synthesis

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