The hydrolysis and precipitation of Pd(II) in 0.6molkg−1 NaCl: A potentiometric, spectrophotometric, and EXAFS study

Boily, Jean-François; Seward, Terry M.; Charnock, John

doi:10.1016/j.gca.2007.08.015

Cited by 23 publications

(14 citation statements)

References 42 publications

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“…16,40,41 The exact nature of such colloids has been the subject of several studies, and it is generally agreed that they are polynuclear Pd n -hydroxo complexes (with n = 3-100), which, depending on the chlorine concentration in the starting solution, might also contain chlorine ligands. 42 While spectra like the one shown do provide a signature for the formation of colloidal particles, the exact assignment of the absorption feature at 270 nm remains a debated topic. According to Klasovsky et al the peak relates to Plasmon excitation in the colloidal particles.…”

Section: Deposition Of Pd On Fe 3 O 4 (111) From Alkaline Pd 2+ Solutionmentioning

confidence: 98%

Model oxide-supported metal catalysts – comparison of ultrahigh vacuum and solution based preparation of Pd nanoparticles on a single-crystalline oxide substrate

Wang

Kaden

Dowler

et al. 2012

Phys. Chem. Chem. Phys.

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Using single-crystalline Fe(3)O(4)(111) films grown over Pt(111) in UHV as a model-support, we have characterized the nucleation behaviour and chemical properties of Pd particles grown over the film using different deposition techniques with scanning tunnelling microscopy and X-ray photoelectron spectroscopy. Comparison of Pd/Fe(3)O(4) samples created via Pd evaporation under UHV conditions and those resulting from the solution deposition of Pd-hydroxo complexes reveals that changes in the interfacial functionalization of such samples (i.e. roughening and hydroxylation) govern the differences in Pd nucleation behavior observed over pristine oxides relative to those exposed to alkaline solutions. Furthermore, it appears that other differences in the nature of the Pd precursor state (i.e. gas-phase Pd in UHV vs. [Pd(OH)(2)](n) aqueous complexes) play a negligible role in Pd nucleation and growth behaviour at elevated temperatures in UHV, suggesting facile decomposition of the Pd complexes deposited from the liquid phase. Applying temperature programmed desorption and infrared spectroscopy to probe the CO chemisorption properties of such samples after reduction in different reagents (CO, H(2)) shows the formation of bimetallic PdFe alloys following reduction in H(2), but monometallic Pd particles after CO reduction.

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Section: Deposition Of Pd On Fe 3 O 4 (111) From Alkaline Pd 2+ Solutionmentioning

confidence: 98%

Model oxide-supported metal catalysts – comparison of ultrahigh vacuum and solution based preparation of Pd nanoparticles on a single-crystalline oxide substrate

Wang

Kaden

Dowler

et al. 2012

Phys. Chem. Chem. Phys.

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show abstract

“…Several theoretical studies have also investigated the structure of Pd(II) complexes using ab initio calculations on gas-phase molecules (Boily and Seward, 2005;Boily et al, 2007). Metal-ligand interactions (e.g., bond lengths) are generally well reproduced using Density Functional Theory (DFT) with current generalized-gradient exchange-correlation functionals.…”

Section: Introductionmentioning

confidence: 99%

Palladium complexation in chloride- and bisulfide-rich fluids: Insights from ab initio molecular dynamics simulations and X-ray absorption spectroscopy

Mei

Etschmann

Liu

et al. 2015

Geochimica et Cosmochimica Acta

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“…When considering the reduction potentials of

{PdCl}_{4}^{2 -}

and

{PtCl}_{4}^{2 -}

, 0.59 V and 0.75 V respectively, both complexes have a lower reduction potential than that of

{Ag}^{+}

(0.8 V) . Still, the reaction can occur due to their quick hydration in aqueous solution to form

{PdCl}_{4 - n} {((), {normalH}_{2}, O)}_{n}^{n - 2}

and

{PtCl}_{4 - n} {((), {normalH}_{2}, O)}_{n}^{n - 2}

complexes with n =0 to 4, whereas the reduction potentials are 0.95 V and 1.18 V for

{Pd ((), {normalH}_{2}, O)}_{4}^{2 +}

and

{Pt ((), {normalH}_{2}, O)}_{4}^{2 +}

respectively, which fulfills the requirement for the oxidation of Ag 0 . However, theses aqua‐chloro complexes (

{MCl}_{4 - n} {((), {normalH}_{2}, O)}_{n}^{n - 2}

, M=Pd or Pt) are also subject to pH‐dependent hydrolysis, where the most hydrolyzed forms

{Pd ((), OH)}_{4}^{2 -}

and

{Pt ((), OH)}_{4}^{2 -}

have reduction potentials of 0.1 and 0.2 V; unlike for gold, here increasing the alkalinity of the solution is obviously not a strategic choice since silver will not be oxidized for any q value in

{MCl}_{4 - q} {((), OH)}_{q}^{2 -}

.…”

Section: Metal Speciation and Galvanic Replacementmentioning

confidence: 83%

Enhancing Galvanic Replacement in Plasmonic Hollow Nanoparticles: Understanding the Role of the Speciation of Metal Ion Precursors

Richard‐Daniel

Boudreau

2020

ChemNanoMat

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Hollow nanostructures offer great potential for plasmonic applications due to their strong and highly tunable localized surface plasmon resonance. The relationship between the plasmonic properties and geometry of hollow nanoparticles, such as core‐shell size ratio, concentricity of the cavity and porosity of the wall, is well documented. Nanoscale galvanic replacement provides a simple, versatile and powerful route for the preparation of such hollow structures. Here we demonstrate how the efficiency of reductant‐assisted galvanic replacement processes can be enhanced by controlling the degree of hydration and hydrolysis of the metal ion precursor using pH and pL as key control parameters (by analogy to pH, the letter p in the expression pL is used to indicate the decimal cologarithm associated with the concentration of the ligand L). Adjusting precursor speciation prior to the sacrificial template's hollowing process offers a new strategy to tune the morphology and optical properties of plasmonic hollow nanostructures.

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The hydrolysis and precipitation of Pd(II) in 0.6molkg−1 NaCl: A potentiometric, spectrophotometric, and EXAFS study

Cited by 23 publications

References 42 publications

Model oxide-supported metal catalysts – comparison of ultrahigh vacuum and solution based preparation of Pd nanoparticles on a single-crystalline oxide substrate

Model oxide-supported metal catalysts – comparison of ultrahigh vacuum and solution based preparation of Pd nanoparticles on a single-crystalline oxide substrate

Palladium complexation in chloride- and bisulfide-rich fluids: Insights from ab initio molecular dynamics simulations and X-ray absorption spectroscopy

Enhancing Galvanic Replacement in Plasmonic Hollow Nanoparticles: Understanding the Role of the Speciation of Metal Ion Precursors

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