Thermodynamic properties of Pd chloride complexes and the Pd2+(aq) ion in aqueous solutions

Polotnyanko, N. A.; Khodakovskii, I. L.

doi:10.1134/s0016702914010054

Cited by 16 publications

(10 citation statements)

References 17 publications

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“…Notably, the Pd 2+ exists as a chloride complex. 26 The same trend of three cathodic responses is also detected by the QCM. When the scan rate is lowered to 0.5 mV s −1 , however, the LSV behavior does not follow the trend of the QCM after cathodic response (ii), indicating that electrochemical reactions that do not affect the mass of the electrode occur in this potential range.…”

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confidence: 60%

Production of Noble-Metal Nanohelices Based on Nonlinear Dynamics in Electrodeposition of Binary Copper Alloys

et al. 2023

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Spatiotemporal pattern formation is dynamic self-organization widely observed in nature and drives various functions. Among these functions, chirality plays a central role. The relationship between dynamic self-organization and chirality has been an open question; therefore, the production of chiral nanomaterials by dynamic self-organization has not been achieved. Here, we show that the confinement of a two-dimensional spatiotemporal micropattern via the electrodeposition of a binary Cu alloy into a nanopore induces mirror symmetry breaking to produce a helical nanostructure of the noble-metal component although it is still not yet possible to control the handedness at this stage. This result suggests that spatiotemporal symmetry breaking functions as a mirror symmetry breaking if cylindrical pores are given as the boundary condition. This study can be a model system of how spatiotemporal symmetry breaking plays a role in mirror symmetry breaking, and it proposes a new approach to producing helical nanomaterials through dynamic self-organization.

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confidence: 60%

Production of Noble-Metal Nanohelices Based on Nonlinear Dynamics in Electrodeposition of Binary Copper Alloys

et al. 2023

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“…These studies imply that the formation mechanism of the PdAu NS is initiated by the formation of small diameter Au NP seeds dispersed in the long chain alkyl quaternary ammonium salt surfactant which serve as a template for the growth of NSs. The faster reduction of Au is understandable given the different standard reduction potential of Au and Pd ions (AuCl 4 – /Au, 1.002 V; PdCl 4 2– /Pd, 0.591 V). , Au-rich alloy NSs are initially formed and the Pd concentration increases with reduction of the precursor as the reaction proceeds. This mechanism accounts for the observed EDX mapping analysis showing the Pd-rich regions located around the NS edges, as after the Au precursor has been consumed, continued growth of the NS produces Pd-rich domains as identified by EDX.…”

Section: Resultsmentioning

confidence: 99%

PdAu Nanosheets for Visible-Light-Driven Suzuki Cross-Coupling Reactions

Casey

Holmes

Collins

2022

ACS Appl. Nano Mater.

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Combining a two-dimensional (2D) morphology and plasmonic photocatalysis represents an efficient design for light-driven organic transformations. We report a one-pot synthesis of surfactant templated PdAu nanosheets (NSs). Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analyses show the formation of 2D PdAu structures was initiated through nanoparticle seeds dispersed in the alkyl ammonium salt surfactant which acted as a template for the growth into NSs. The PdAu NSs were used for visible-light-enhanced Suzuki cross coupling. The PdAu bimetallic NSs outperformed monometallic Pd NSs and commercial Pd/C in room-temperature Suzuki cross-coupling reactions. The high catalytic activity is attributed to a combination of the 2D morphology giving rise to plasmon-enhanced catalysis and a high density of surface atoms, the electron-rich Pd surface due to alloying, and the presence of weakly bound amines. A comparative study of surfactant-assisted NSs and CO-assisted NSs was also carried out to assess the influence of surface ligands on the catalytic and photocatalytic enhancement of NSs with similar morphology. The surfactant-assisted NSs showed substantially superior performance compared to the CO-assisted for room-temperature Suzuki coupling reactions.

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“…The experimental data obtained by electronic absorption spectra were confirmed by calculation. Using the values of the stepwise formation constants of [PdCl 4 ] 2– and the constants of palladium hydrolysis, we calculated the distribution of various forms of palladium(II) in solution. At higher concentrations of chloride ions, acidity has no significant effect on palladium complexes.…”

Section: Resultsmentioning

confidence: 99%

“…The complex [PdCl 4 ] 2– is stable at chloride ion concentrations above 0.5 mol·L –1 . At lower concentrations of Cl – , complexes of various compositions [Pd(H 2 O) x Cl 4– x ] (2– x )– are formed . To prevent hydrolysis of palladium(II), the pH should be less than 4 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Chloride and pH on the Composition of the Equilibrium Phases and the Partition of Palladium(II) in the Aqueous Two-Phase System PEG1500–Na₂SO₄–Water

et al. 2021

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Binodal curves for aqueous two-phase systems (ATPS) polyethylene glycol 1500 (PEG1500)−sodium sulfate− water with additions of sodium chloride and hydrochloric or sulfuric acids were determined by turbidimetric titration and analysis of coexisting phases. The results are compared with published data for the ATPS PEG1500−sodium sulfate−water without additions, and the influence of additions on the width of the two-phase field, tielines length, and slopes was traced. The influence of initial concentration of palladium, time of phase contact, pH, concentration of sodium chloride and sodium sulfate on the extraction of palladium(II) was studied. The coefficients of distribution of palladium(II) between the phases of ATPS were measured as a function of the concentrations of sodium chloride (0.1, 1.0, and 2.0 mol•L −1 ) and pH values. At lower concentrations of Cl − ions Pd(II) is extracted as a mixture of ions [Pd(H 2 O)Cl 3 ] − and [PdCl 4 ] 2− , whereas the growth of C(Cl − ) leads to prevalence of the latter, which has poorer extraction properties. Maximal values of the distribution coefficient D Pd of about 9.5 ± 0.75 were achieved in the ATPS PEG1500−Na 2 SO 4 −0.1 M HCl and PEG1500− Na 2 SO 4 −(0.05 M H 2 SO 4 + 0.1 M NaCl).

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Thermodynamic properties of Pd chloride complexes and the Pd2+(aq) ion in aqueous solutions

Cited by 16 publications

References 17 publications

Production of Noble-Metal Nanohelices Based on Nonlinear Dynamics in Electrodeposition of Binary Copper Alloys

Production of Noble-Metal Nanohelices Based on Nonlinear Dynamics in Electrodeposition of Binary Copper Alloys

PdAu Nanosheets for Visible-Light-Driven Suzuki Cross-Coupling Reactions

Effect of Sodium Chloride and pH on the Composition of the Equilibrium Phases and the Partition of Palladium(II) in the Aqueous Two-Phase System PEG1500–Na₂SO₄–Water

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Thermodynamic properties of Pd chloride complexes and the Pd2+(aq) ion in aqueous solutions

Cited by 16 publications

References 17 publications

Production of Noble-Metal Nanohelices Based on Nonlinear Dynamics in Electrodeposition of Binary Copper Alloys

Production of Noble-Metal Nanohelices Based on Nonlinear Dynamics in Electrodeposition of Binary Copper Alloys

PdAu Nanosheets for Visible-Light-Driven Suzuki Cross-Coupling Reactions

Effect of Sodium Chloride and pH on the Composition of the Equilibrium Phases and the Partition of Palladium(II) in the Aqueous Two-Phase System PEG1500–Na2SO4–Water

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Effect of Sodium Chloride and pH on the Composition of the Equilibrium Phases and the Partition of Palladium(II) in the Aqueous Two-Phase System PEG1500–Na₂SO₄–Water