Green synthesis of palladium nanoparticles mediated by black tea leaves ( Camellia sinensis ) extract: Catalytic activity in the reduction of 4-nitrophenol and Suzuki-Miyaura coupling reaction under ligand-free conditions

Lebaschi, Sadaf; Hekmati, Malak; Veisi, Hojat

doi:10.1016/j.jcis.2016.09.027

Cited by 242 publications

(74 citation statements)

References 35 publications

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“…The PdNPs have enormous catalytic potential in various organic transformations, including Suzukicross, Mizoroki-Heck, Stille, and Sonogashira coupling reactions. [9][10][11] However, the application of PdNPs in the biomedical field is yet to be adequately investigated, although the green-synthesized PdNPs possess remarkable antioxidant 12,13 and antimicrobial activities. 12,14 Plant-derived PdNPs seem to have potential for application in cancer therapy because these compounds are also toxic to cancer cells.…”

Section: Introductionmentioning

confidence: 99%

Green synthesis palladium nanoparticles mediated by white tea (<em>Camellia sinensis</em>) extract with antioxidant, antibacterial, and antiproliferative activities toward the human leukemia (MOLT-4) cell line

Azizi¹,

Shahri²,

Rahman³

et al. 2017

IJN

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Among nanoparticles used for medical applications, palladium nanoparticles (PdNPs) are among the least investigated. This study was undertaken to develop PdNPs by green synthesis using white tea (W.tea; Camellia sinensis ) extract to produce the Pd@W.tea NPs. The Pd@W.tea NPs were characterized by UV–vis spectroscopy and X-ray diffractometry, and evaluated with transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The Pd@W.tea NPs were spherical (size 6–18 nm) and contained phenols and flavonoids acquired from the W.tea extract. Pd@W.tea NPs has good 1-diphenyl-2-picrylhydrazyl (DPPH), OH, and NO-scavenging properties as well as antibacterial effects toward Staphylococcus epidermidis and Escherichia coli . MTT assay showed that Pd@W.tea NPs (IC 50 =0.006 μM) were more antiproliferative toward the human leukemia (MOLT-4) cells than the W.tea extract (IC 50 =0.894 μM), doxorubicin (IC 50 =2.133 μM), or cisplatin (IC 50 =0.013 μM), whereas they were relatively innocuous for normal human fibroblast (HDF-a) cells. The anticancer cell effects of Pd@W.tea NPs are mediated through the induction of apoptosis and G2/M cell-cycle arrest.

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Section: Introductionmentioning

confidence: 99%

Green synthesis palladium nanoparticles mediated by white tea (<em>Camellia sinensis</em>) extract with antioxidant, antibacterial, and antiproliferative activities toward the human leukemia (MOLT-4) cell line

Azizi¹,

Shahri²,

Rahman³

et al. 2017

IJN

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“…Biaryls have broad applications in the synthesis of natural products, advanced materials and pharmaceuticals . Recently various types of Pd‐anchored ligand‐based SBA‐15 have been reported for the synthesis of biaryl compounds . Cao and co‐workers described the synthesis of a Pd‐diimine@SBA‐15 catalyst for Suzuki–Miyaura coupling through immobilizing Pd ions into the pore channels of diimine‐functionalized SBA‐15 mesoporous silica .…”

Section: Introductionmentioning

confidence: 99%

“…[36][37][38] Recently various types of Pd-anchored ligand-based SBA-15 have been reported for the synthesis of biaryl compounds. [39][40][41][42][43] Cao and co-workers described the synthesis of a Pd-diimine@SBA-15 catalyst for Suzuki-Miyaura coupling through immobilizing Pd ions into the pore channels of diimine-functionalized SBA-15 mesoporous silica. [2] Sarkar et al prepared a thiol-modified SBA-15-supported Pd catalyst for Suzuki coupling reaction under mild reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

Palladium‐anchored multidentate SBA‐15/di‐urea nanoreactor: A highly active catalyst for Suzuki coupling reaction

Rohani

Ziarani

Badiei

et al. 2018

Applied Organom Chemis

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Modification of mesoporous silica was carried out by reaction of SBA‐15 with di‐urea‐based ligand. Next, with the help of this ligand, palladium ions were anchored within the multidentate SBA‐15/di‐urea pore channels with high dispersion. The SBA‐15/di‐urea/Pd catalyst was characterized using various techniques. Theoretical calculations indicated that each palladium ion was strongly interacted with one nitrogen and two oxygen atoms from the multidentate di‐urea ligand located in SBA‐15 channels and these interactions remained during the catalytic cycle. These results are in good agreement with those of hot filtration test: the palladium ions have very high stability against leaching from the SBA‐15/di‐urea support. The catalytic performance of SBA‐15/di‐urea/Pd nanostructure was examined for the Suzuki coupling reaction of phenylboronic acid and electronically diverse aryl halides under mild conditions with a minimal amount of Pd (0.26 mol%). Compared to previous reports, this protocol afforded some advantages such as short reaction times, high yields of products, catalyst stability without leaching, easy catalyst recovery and preservation of catalytic activity for at least six successive runs.

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“…[2,4,5,14,38] The high surface-tovolume ratio in the nanometer dimension even makes Pd NPs more effective catalyst. [3,24,39] Subsequently Pd NPs are widely used as catalyst in low-temperature oxidation/reduction of automobile pollutants, [40][41][42] coupling reactions, [2,4,24,[30][31][32][43][44][45] hydrogenation reaction [23,46] as well as other organic reactions. However, Pd earned a reputation as a catalyst for their remarkable success in C-C coupling reactions which is considered to be one of the most powerful and a versatile method for the synthesis of asymmetric biaryl compounds from aryl boronic acids and aryl halides.…”

Section: Introductionmentioning

confidence: 99%

Green chemical synthesis of Pd nanoparticles for use as efficient catalyst in Suzuki‐Miyaura cross‐coupling reaction

Phukan

Mahanta

Kakati

et al. 2018

Applied Organom Chemis

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Herein, we report the synthesis of tiny spherical Pd nanoparticles (NPs) by green chemical method under ambient conditions using flower extract of Lantana camara plant. The size of the Pd NPs is tunable from 4.7 to 6.3 nm by systematically controlling the concentration of either metal ions or plant extract. The synthesized Pd NPs were well characterized by different spectroscopic, microscopic and diffractometric techniques. The Pd NPs offered good size‐dependent catalytic activity in the Suzuki‐Miyaura C‐C coupling reaction under mild reaction conditions in (1: 1) water‐ethanol mixture. The catalyst is stable and exhibited excellent reusability up to three cycles of coupling reaction after which the catalytic activity decreases.

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Green synthesis of palladium nanoparticles mediated by black tea leaves ( Camellia sinensis ) extract: Catalytic activity in the reduction of 4-nitrophenol and Suzuki-Miyaura coupling reaction under ligand-free conditions

Cited by 242 publications

References 35 publications

Green synthesis palladium nanoparticles mediated by white tea (<em>Camellia sinensis</em>) extract with antioxidant, antibacterial, and antiproliferative activities toward the human leukemia (MOLT-4) cell line

Green synthesis palladium nanoparticles mediated by white tea (<em>Camellia sinensis</em>) extract with antioxidant, antibacterial, and antiproliferative activities toward the human leukemia (MOLT-4) cell line

Palladium‐anchored multidentate SBA‐15/di‐urea nanoreactor: A highly active catalyst for Suzuki coupling reaction

Green chemical synthesis of Pd nanoparticles for use as efficient catalyst in Suzuki‐Miyaura cross‐coupling reaction

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