Functionalization of small platinum nanoparticles with amines and phosphines: Ligand binding modes and particle stability

Wand, Patricia; Bartl, Johannes D.; Tschurl, Martin; Cokoja, Mirza

doi:10.1016/j.jcis.2016.06.003

Cited by 22 publications

(13 citation statements)

References 53 publications

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“…Thus, the enhanced catalytic activity of samples prepared in the ionic liquid versus toluene/triethylamine may be due to decreased organic content strongly associated with the platinum nanoparticle catalytic sites. This is consistent with previous reports that showed triethylamine binding to the surface of platinum nanoparticles [37], and the known improvement in catalyst performance for metal particles synthesized in ionic liquids [13]. However, the increase in dye degradation rate observed for IL-NR compared to tol-NR, though statistically significant and reproducible, was narrow.…”

Section: Resultssupporting

confidence: 92%

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

Ballentine

Embry

Garcia

et al. 2019

Beilstein J. Nanotechnol.

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The current study investigates whether metal deposition onto an existing nanorod can be carried out using an ionic liquid, and the effect this has on catalytic performance. Platinum, gold, and silver nanoparticles were deposited onto CdSe@CdS (core@shell) nanorods from metal salts in an ionic liquid (1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) without additional surfactants or reducing agents. Photocatalytic dye degradation experiments showed that catalysts with platinum particles deposited using the ionic liquid out-performed similar materials synthesized using organic solvents and ligands. We concluded that metal particles can be deposited onto well-defined semiconductor nanorods using ionic liquids and metal salts without the need for additional reagents, and the deposited particles did not cause significant aggregation even when these materials were taken into organic media. It is possible that a broad range of metal/semiconductor heterostructured particles can be prepared using the methods reported here.

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Section: Resultssupporting

confidence: 92%

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

Ballentine

Embry

Garcia

et al. 2019

Beilstein J. Nanotechnol.

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“…This result suggests that the PEGylation of small Pt NPs is due to Pt-H-N moieties or electrostatic interactions between amide species and Pt, as proposed in other work. 70…”

Section: Synthesis and Characterization Of Ptpeg Npsmentioning

confidence: 99%

<p>Green One-Step Synthesis of Medical Nanoagents for Advanced Radiation Therapy</p>

Salado-Leza¹,

Porcel²,

Yang³

et al. 2020

NSA

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Purpose: Metal-based nanoparticles (M-NPs) have attracted great attention in nanomedicine due to their capacity to amplify and improve the tumor targeting of medical beams. However, their simple, efficient, high-yield and reproducible production remains a challenge. Currently, M-NPs are mainly synthesized by chemical methods or radiolysis using toxic reactants. The waste of time, loss of material and potential environmental hazards are major limitations. Materials and Methods: This work proposes a simple, fast and green strategy to synthesize small, non-toxic and stable NPs in water with a 100% production rate. Ionizing radiation is used to simultaneously synthesize and sterilize the containing NPs solutions. The synthesis of platinum nanoparticles (Pt NPs) coated with biocompatible poly(ethylene glycol) ligands (PEG) is presented as proof of concept. The physicochemical properties of NPs were studied by complementary specialized techniques. Their toxicity and radio-enhancing properties were evaluated in a cancerous in vitro model. Using plasmid nanoprobes, we investigated the elementary mechanisms underpinning radio-enhancement. Results and Discussion: Pt NPs showed nearly spherical-like shapes and an average hydrodynamic diameter of 9 nm. NPs are zero-valent platinum successfully coated with PEG. They were found non-toxic and have the singular property of amplifying cell killing induced by γ-rays (14%) and even more, the effects of carbon ions (44%) used in particle therapy. They induce nanosized-molecular damage, which is a major finding to potentially implement this protocol in treatment planning simulations. Conclusion: This new eco-friendly, fast and simple proposed method opens a new era of engineering water-soluble biocompatible NPs and boosts the development of NP-aided radiation therapies.

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“…[15] Phosphane-functionalised IL surfactants showed an enhanced catalyst performance. [16] Another study shows the effect of the nature of thiolate capping agents and influence of the chemical and structural composition of the surface monolayers on the catalytic activity and selectivity of colloidal Pd [17] and Pt [18] NPs. Beller et al reported on a change of stereoselectivity in the semi-hydrogenation of alkynes to the respective E-and Z-alkenes upon addition of multidentate phosphane ligands using a monometallic Ni catalyst.…”

Section: Introductionmentioning

confidence: 99%

Steric and Electronic Effects of Phosphane Additives on the Catalytic Performance of Colloidal Palladium Nanoparticles in the Semi‐Hydrogenation of Alkynes

et al. 2020

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We report on the influence of phosphanes on the catalytic activity and selectivity of colloidal, tetraoctylammonium bromide (TOAB) stabilised palladium nanoparticles (NPs) in the semi‐hydrogenation of alkynes to olefins. Full characterisation of the catalytic system (HRTEM, EDX, XPS, IR, NMR) confirmed the formation of spherical particles with a narrow size distribution (1.9±0.5 nm). The catalytic performance of the Pd NPs in the semi‐hydrogenation of 1‐octyne, 2‐octyne and phenylacetylene to the respective olefins and the influences on the selectivity was investigated. The system shows high activities and selectivities at mild conditions (0 °C and 1.0 bar H2 pressure). It was shown that generally, phosphanes lead to an increase of both the reaction rate and selectivity towards the olefin where both steric and electronic effects of the ligand play a crucial role for the catalyst performance. A moderate steric demand of the ligand with a rather weak σ‐donating ability turned out to give the highest catalytic performance.

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Functionalization of small platinum nanoparticles with amines and phosphines: Ligand binding modes and particle stability

Cited by 22 publications

References 53 publications

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

Deposition of metal particles onto semiconductor nanorods using an ionic liquid

<p>Green One-Step Synthesis of Medical Nanoagents for Advanced Radiation Therapy</p>

Steric and Electronic Effects of Phosphane Additives on the Catalytic Performance of Colloidal Palladium Nanoparticles in the Semi‐Hydrogenation of Alkynes

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