Palladium nanoparticles supported on natural nanozeolite clinoptilolite as a catalyst for ligand and copper-free C–C and C–O cross coupling reactions in aqueous medium

Baghbanian, Seyed Meysam; Yadollahy, Horieh; Tajbakhsh, Mahmood; Farhang, Maryam; Biparva, Pourya

doi:10.1039/c4ra11411f

Cited by 28 publications

(9 citation statements)

References 64 publications

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“…Their results showed that the specific surface of the natural nanozeolite (clinoptilolite) increased from 49.7 to 55.6 m 2 /g, and the pore diameter decreased from 12.19 to 8.05 nm, after acid activation. However, after the coupling of palladium in nanozeolite, the BET surface area decreased and the pore diameter tended to increase [33].…”

Section: Resultsmentioning

confidence: 99%

Obtaining Nanoparticles of Chilean Natural Zeolite and its Ion Exchange with Copper Salt (Cu2+) for Antibacterial Applications

et al. 2019

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This article describes the production of nanoparticles of Chilean natural zeolite, using three size reduction methods: Ball mill, microgrinding, and microfluidization. Morphological characterization of samples indicated an average diameter of 37.2 ± 15.8 nm of the zeolite particles. The size reduction and chemical treatments did not affect the morphology or integrity of the zeolite. An increase of the zeolite samples’ Si/Al ratio was observed after the acid treatment and was confirmed by SEM-EDX analysis. Moreover, the effectiveness of the copper salt ion exchange (Cu2+) to the zeolite nanoparticles was analyzed by SEM-EDX. XRD analysis indicated that clinoptilolite and mordenite are the main phases of Chilean natural zeolite, and the crystalline structure was not affected by the modification processes. The FTIR characterization showed the presence of chemical bonds of copper with the zeolite nanoparticle framework. The ion-exchanged zeolite nanoparticles were evaluated for antibacterial behavior by the disc diffusion method. Additionally, the minimum inhibitory concentration and minimum bactericidal concentration were obtained. Microbiological assays with copper-exchanged nanozeolites showed an antimicrobial activity with a bactericidal effect against Escherichia coli and Staphylococcus aureus, which are the primary pathogens of food and are also resistant to multiple drugs. In this study, a new application for natural nanozeolites is demonstrated, as the incorporated copper ions (Cu2+) in nanozeolites registered a productive antibacterial activity.

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Section: Resultsmentioning

confidence: 99%

Obtaining Nanoparticles of Chilean Natural Zeolite and its Ion Exchange with Copper Salt (Cu2+) for Antibacterial Applications

et al. 2019

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“…Nevertheless, the reaction became sluggish when aryl bromides and chlorides were employed, being necessary longer reaction times. 69 …”

Section: Palladium Nanocatalystsmentioning

confidence: 99%

Diaryl ethers synthesis: nano-catalysts in carbon-oxygen cross-coupling reactions

et al. 2018

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The diaryl ether moiety is not only prevalent in a significant number of natural products and synthetic pharmaceuticals but also widely found in many pesticides, polymers, and ligands. Ullmann-type crosscoupling reactions between phenols and aryl halides are regarded as one of the most important methods for the synthesis of this important and versatile structural motif. In recent years, the use of nano-sized metal catalysts in this coupling reaction has attracted a lot of attention because of these catalysts with their high surface-to-volume ratio, high surface energy, and reactive morphology allows for rapid C-O bond formation under mild and ligand-free conditions. In this review we will highlight the power of these catalysts in Ullmann-type C-O cross-coupling reactions.

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“…Palladium based systems include mainly the palladium complexes of phosphine ligands reported by the pioneers of C−O coupling reaction i. e. Buchwald and Hartwig . Some other important catalysts which have been reported recently include palladacycles of Schiff bases of ferrocene carboxaldehyde, supported palladium nanoparticles on nanozeolite clinoptilolite and graphene oxide . Palladium catalysts containing phosphine ligands suffer from disadvantage related to high sensitivity of phosphine ligands towards moisture and air.…”

Section: Introductionmentioning

confidence: 99%

Chalcogen (S/Se) Ligated Palladium(II) Complexes of Bulky Ligands: Application in O‐Arylation of Phenol

et al. 2019

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Two N-pyrene based ligands L1 (1-pyrene-CH=N(CH 2 ) 2 -SPh) and L2 (1-pyrene-CH=N(CH 2 ) 2 -SePh) with an imine functionality and a chalcogen donor have been synthesized and characterized using 1 H as well as 13 C NMR spectral techniques. Palladium(II) complexes (1; PdCl 2 À ĸ 2 À L1 and 2; PdCl 2 À ĸ 2 À L2) of L1 and L2 have been prepared, isolated and characterized using NMR and single crystal X-ray diffraction studies. The geometry around Pd is nearly square planar in these complexes and ligands are coordinated to the metal centre in a bidentate (S/ Se, N) mode. The molecular complexes 1 and 2 have been explored as potential catalysts in O À arylation reaction between substituted aryl halides and phenol. Both the complexes showed excellent efficiency towards this coupling and a TON of 990 (maximum TOF 310) has been achieved using 0.1 mol% of catalyst 2. The effect of the nature of chalcogen donor atom (S/Se) on catalytic efficiency of the complexes has been observed as selenium congener was more efficient than sulphur counterpart.

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Palladium nanoparticles supported on natural nanozeolite clinoptilolite as a catalyst for ligand and copper-free C–C and C–O cross coupling reactions in aqueous medium

Cited by 28 publications

References 64 publications

Obtaining Nanoparticles of Chilean Natural Zeolite and its Ion Exchange with Copper Salt (Cu2+) for Antibacterial Applications

Obtaining Nanoparticles of Chilean Natural Zeolite and its Ion Exchange with Copper Salt (Cu2+) for Antibacterial Applications

Diaryl ethers synthesis: nano-catalysts in carbon-oxygen cross-coupling reactions

Chalcogen (S/Se) Ligated Palladium(II) Complexes of Bulky Ligands: Application in O‐Arylation of Phenol

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