Journal ArticleDOI
Pd nanoparticles immobilized on PAMAM-grafted MWCNTs hybrid materials as new recyclable catalyst for Mizoraki–Heck cross-coupling reactions
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TLDR
In this article, the PAMAM-grafted-MWCNTs (PAMAMg-mwcNTs) hybrid materials were obtained and their application as a new nanocatalyst toward Heck reaction in different conditions was investigated.Abstract:
Polyamidoamine (PAMAM) dendrimers up to the third generation (G) were grown onto the surface of functionalized multiwall carbon nanotubes (MWCNTs-NH 2 ) by a divergent method, the PAMAM-grafted-MWCNTs (PAMAM-g-MWCNTs) hybrid materials were obtained. Because of the surface modification of the multiwall carbon nanotubes with PAMAM dendrimers, these hybrid materials are not only soluble in aqueous medium but also are able to trap water soluble metal ions such as Pd 2+ via complex formation of PAMAM dendrimer with metal ions. The reduction of trapped palladium ions in the dendritic shell of PAMAM-g-MWCNTs by sodium borohydride led to immobilized palladium nanoparticles on the surface of MWCNTs. Thus, palladium nanoparticles were immobilized by PAMAM-g-MWCNTs hybrid materials (PdNs-PAMAM-g-MWCNTs) and their application as a new nanocatalyst toward Heck reaction in different conditions was investigated. The G3 and G2 hybrid materials were found to be very active in cross-coupling reactions of aryl iodides, bromides and also chlorides with olefinic compounds in Heck reactions with short reaction time duration and high yields. The catalyst can be recycled several times without loss in activity.read more
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Journal ArticleDOI
Single-Walled Carbon Nanotube–Polyamidoamine Dendrimer Hybrids for Heterogeneous Catalysis
Francesco Giacalone,Vincenzo Campisciano,Carla Calabrese,Valeria La Parola,Zois Syrgiannis,Maurizio Prato,Maurizio Prato,Michelangelo Gruttadauria +7 more
TL;DR: The synthesis and catalytic properties of single-walled carbon nanotube-polyamidoamine dendrimers hybrids (SWCNT-PAMAM), prepared via a convergent strategy, suggest that a "release and catch" mechanism is operative in both reactions, although during Heck reaction small catalytically active soluble Pd species are also present.
Journal ArticleDOI
A new method for the enhancement of electromembrane extraction efficiency using carbon nanotube reinforced hollow fiber for the determination of acidic drugs in spiked plasma, urine, breast milk and wastewater samples
TL;DR: The developed method was successfully used for the determination of ibuprofen and naproxen in different spiked matrices including plasma, urine, breast milk and wastewater samples and showed better results than the conventional EME method.
Journal ArticleDOI
Core/Shell Ruthenium–Halloysite Nanocatalysts for Hydrogenation of Phenol
Vladimir A. Vinokurov,Aleksandr Glotov,Yaroslav A. Chudakov,Anna Stavitskaya,Evgenii Ivanov,Pavel A. Gushchin,Anna Zolotukhina,Anton L. Maximov,Karakhanov Eduard A,Yuri M. Lvov,Yuri M. Lvov +10 more
TL;DR: Halloysite tubular nanoclay was applied as a template for synthesis of ruthenium core-shell composite catalysts for the first time; 50 nm diameter ceramic tubular systems with metal seeded interiors were produced.
Journal ArticleDOI
Functionalization of fullerene (C60) with metformine to immobilized palladium as a novel heterogeneous and reusable nanocatalyst in the Suzuki–Miyaura coupling reaction at room temperature
TL;DR: In this paper, a catalytic catalyst for biguanide-functionalized fullerene (C 60 -Met/Pd 2+ ) hybrid materials was fabricated for the first time.
Journal ArticleDOI
Fe3O4–SiO2–P4VP pH‐Sensitive Microgel for Immobilization of Nickel Nanoparticles: An Efficient Heterogeneous Catalyst for Nitrile Reduction in Water
TL;DR: In this paper, the surface-initiated atom transfer radical polymerization of 4-vinylpyridine was performed in the presence of Fe3O4−SiO2−P4VP nanoparticles, which led to the formation of Fe 3O4-SiO 2−P 4VP hybrid microgels crosslinked with NiNPs.
References
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Journal ArticleDOI
Helical microtubules of graphitic carbon
TL;DR: Iijima et al. as mentioned in this paper reported the preparation of a new type of finite carbon structure consisting of needle-like tubes, which were produced using an arc-discharge evaporation method similar to that used for fullerene synthesis.
Journal ArticleDOI
Palladium-catalyzed cross-coupling reactions of organoboron compounds
Norio Miyaura,Akira Suzuki +1 more
TL;DR: In this paper, a cross-coupling reaction is proposed for coupling 1 -Alkenylboron Derivatives: Synthesis of Conjugated Dienes 6.
Journal ArticleDOI
Carbon Nanotubes--the Route Toward Applications
TL;DR: Many potential applications have been proposed for carbon nanotubes, including conductive and high-strength composites; energy storage and energy conversion devices; sensors; field emission displays and radiation sources; hydrogen storage media; and nanometer-sized semiconductor devices, probes, and interconnects.
Journal ArticleDOI
Chemistry and properties of nanocrystals of different shapes.
TL;DR: The interest in nanoscale materials stems from the fact that new properties are acquired at this length scale and, equally important, that these properties are equally important.
Journal ArticleDOI
A new class of polymers: Starburst-dendritic macromolecules
Donald A. Tomalia,H. Baker,James R Dewald,Michael B. Hall,G. Kallos,Steven J. Martin,J. Roeck,J. Ryder,Patrick B. Smith +8 more
TL;DR: Starburst polymers as mentioned in this paper are a class of topological macromolecules which are derived from classical monomers/oligomers by their extraordinary symmetry, high branching and maximized terminal functionality density.
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