Silver nanoparticles stabilized by a polyaminocyclodextrin as catalysts for the reduction of nitroaromatic compounds

Russo, Marco; Armetta, Francesco; Riela, Serena; Martino, Delia Chillura; Meo, Paolo Lo; Noto, Renato

doi:10.1016/j.molcata.2015.07.031

Cited by 24 publications

(31 citation statements)

References 62 publications

(48 reference statements)

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“…Moreover, spectra show a shoulder or even a secondary band between 450 and 550 nm. A similar feature had been already observed after dilution of AgNamCD systems obtained by chemical reduction, and was attributed to the modification of the chemical micro‐environment around the AgNP s . In our case, it can be hypothesized that such a modification is due to a partial oxidative degradation of the amCD coating layer caused by a ligand‐to‐metal electron transfer after photoactivation.…”

Section: Resultssupporting

confidence: 86%

“…After irradiation, regardless of the source used, each sample showed the typical reddish color of AgNP s. The UV‐vis spectra of the systems (representative examples are depicted in Figure ; see data in Supporting, Table S1) show in general a lower intensity of the characteristic LSPR band centered at ca. 400 nm, as compared to analogous samples obtained by chemical reduction with formaldehyde . This implies that a significant amount of Ag + remains unreduced in the process.…”

Section: Resultsmentioning

confidence: 75%

“…We have been recently interested in the synthesis of AgNP /polyaminocyclodextrin nanocomposites ( AgNamCD s), obtained by reduction of the well‐known [Ag(NH 3 ) 2 ] + ion with formaldehyde or NaBH 4 in the presence of polyaminocyclodextrins ( amCD s), because of the peculiar catalytic properties of these systems . Such properties arise from the ability of the amCD to function both as a supramolecular host and as the capping agent for the AgNP .…”

Section: Introductionmentioning

confidence: 99%

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Convenient Photochemical Synthesis of Silver‐Polyaminocyclodextrin Nanocomposites: The Role of the Light Source from a Mechanistic Viewpoint

et al. 2018

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An investigation on the light-driven reduction of the [Ag(NH 3 ) 2 ] + complex in the presence of polyaminocyclodextrins was carried out, in order to clarify the mechanism of the process. The role of the organic auxiliary as both the sacrificial reductant and the capping agent was positively assessed. Moreover, particular attention was paid to the role of the irradiation source. Experimental results indicate that a complex mechanism is involved in the formation of the nanocomposite, with a primary photoinduced single-electron-transfer process promoted by irradiation with green light, followed by a secondary chemical reduction process activated by NIR. Representative composites were characterized by means of FTIR, TEM and SAED techniques. The light-driven approach proposed here appears an appealing "green", bio-friendly method for the synthesis of stable nanosized silver composites, in view of possible applications as antimicrobial agents.[a] Dr.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Convenient Photochemical Synthesis of Silver‐Polyaminocyclodextrin Nanocomposites: The Role of the Light Source from a Mechanistic Viewpoint

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“…Furthermore, it was observed that the presence of a negative charge on the ancillary chain bound to the N atom (entries 4 and 7) disadvantages the reduction reaction. This probably reflects a more difficult approach of the anionic reducing agent to the nitroarene–catalyst …”

Section: Resultsmentioning

confidence: 99%

Gold nanoparticles stabilized by modified halloysite nanotubes for catalytic applications

Massaro

Colletti

Fiore

et al. 2018

Applied Organom Chemis

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A highly sustainable prototype of a flow system based on gold nanoparticles (4.2 nm) supported on thiol‐functionalized halloysite nanotubes (HNTs) was developed for catalytic applications. The catalytic performances were evaluated using the reduction of 4‐nitrophenol to 4‐aminophenol as a model system. Under the best experimental conditions (0.0001 mol%, 1.97 × 10−8 mg of Au nanoparticles), an impressive apparent turnover frequency value up to 2 204 530 h−1 was achieved and the halloysite‐based catalyst showed full recyclability even after ten cycles. The high catalytic activity confirms the importance of the use of HNTs as support for Au nanoparticles that can exert a synergistic effect both as medium for transfer of electrons from borohydride ions to 4‐nitrophenol and by modulating interfacial electron transfer dynamics. With the application of flow technology, the obtained heterogeneous HNT@Au catalyst was fully recovered and reused for at least one month.

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“…The acid–base behaviour of these materials can be modelled as a mixture of independent virtual weak bases. We already have employed these products as capping agents for the preparation of silver nanocomposites [ 37 ], which in turn have been tested as catalysts for nitroarene reduction and as antimicrobial agents in synergism with classical antibiotics [ 40 – 41 ]. Moreover, the same products have been used for the synthesis of pH-responsive nanosponges [ 42 ].…”

Section: Introductionmentioning

confidence: 99%

Binding abilities of polyaminocyclodextrins: polarimetric investigations and biological assays

Russo¹,

Corte²,

Pisciotta³

et al. 2017

Beilstein J. Org. Chem.

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Three polyaminocyclodextrin materials, obtained by direct reaction between heptakis(6-deoxy-6-iodo)-β-cyclodextrin and the proper linear polyamines, were investigated for their binding properties, in order to assess their potential applications in biological systems, such as vectors for simultaneous drug and gene cellular uptake or alternatively for the protection of macromolecules. In particular, we exploited polarimetry to test their interaction with some model p-nitroaniline derivatives, chosen as probe guests. The data obtained indicate that binding inside the host cavity is mainly affected by interplay between Coulomb interactions and conformational restraints. Moreover, simultaneous interaction of the cationic polyamine pendant bush at the primary rim was positively assessed. Insights on quantitative aspects of the interaction between our materials and polyanions were investigated by studying the binding with sodium alginate. Finally, the complexation abilities of the same materials towards polynucleotides were assessed by studying their interaction with the model plasmid pUC19. Our results positively highlight the ability of our materials to exploit both the cavity and the polycationic branches, thus functioning as bimodal ligands.

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Silver nanoparticles stabilized by a polyaminocyclodextrin as catalysts for the reduction of nitroaromatic compounds

Cited by 24 publications

References 62 publications

Convenient Photochemical Synthesis of Silver‐Polyaminocyclodextrin Nanocomposites: The Role of the Light Source from a Mechanistic Viewpoint

Convenient Photochemical Synthesis of Silver‐Polyaminocyclodextrin Nanocomposites: The Role of the Light Source from a Mechanistic Viewpoint

Gold nanoparticles stabilized by modified halloysite nanotubes for catalytic applications

Binding abilities of polyaminocyclodextrins: polarimetric investigations and biological assays

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