The Hydrogen Fluoride Solvent System. IV. Metallic Complexes in Liquid HF<sup>1</sup>

Clifford, A. F.; Sargent, Jerome W.

doi:10.1021/ja01572a022

Cited by 13 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Overall, it is important to note that among the different solvents containing AHF, the anodic dissolution charge density of the electrodes increases in the order: sulpholane \ PC \ AN. The highest charge density noted in AN/ AHF medium originates not only through electrochemical pathway, but also by chemical route leading to the formation of blue coloured Ni(CH 3 CN) 2 F 2 complex along with NiF 2 film, as evidenced by a previous report [30]. On the other hand, no such chemical dissolution takes place during the anodic polarisation of Ni in sulpholane/AHF medium, as this solvent forms a thin uniform composite layer on the nickel fluoride surface and this film prevents further dissolution of nickel [26].…”

Section: Resultssupporting

confidence: 57%

Influence of triethylamine on the anodic dissolution characteristics of Ni, Cu and their alloys in non-aqueous solvents containing fluoride media: voltammetric and surface morphologic study

et al. 2012

View full text Add to dashboard Cite

Multisweep cyclic voltammetric (CV) responses of nickel, copper, Monel and nickel-copper alloy had been extensively studied and compared in different nonaqueous solvents, such as acetonitrile (AN), propylene carbonate (PC) and sulpholane-containing anhydrous hydrogen fluoride (AHF) medium in the absence and the presence of triethylamine (Et 3 N). The quantity of dissolution and surface morphological transformation on the electrodes as a result of anodic polarisation were investigated by means of atomic absorption spectroscopy and scanning electron microscopy (SEM), respectively. The CV study indicates that Ni, Cu and their alloys are highly unstable in AN/AHF medium. Surface morphology of Ni after polarisation in this medium reveals the generation of number of pits, whereas the evolution of small crystallites of CuF 2 is noted on the polarised alloy material, as evidenced by SEM pictures. The dissolution characteristics decrease significantly in PC/AHF medium and become low in sulpholanecontaining fluoride medium on the four electrodes. The relative solubility of metal fluoride film in the three solvents increases in the order: sulpholane \ PC \ AN. The voltammograms suggest that addition of Et 3 N (0.5 M) to AN-and PC-containing AHF medium helps both in maintaining uniform dissolution and generating compact fluoride film on the electrode surface. The addition of Et 3 N to AHF/sulpholane medium shows only little influence in improving the electrocatalytic oxidation process.

show abstract

Section: Resultssupporting

confidence: 57%

Influence of triethylamine on the anodic dissolution characteristics of Ni, Cu and their alloys in non-aqueous solvents containing fluoride media: voltammetric and surface morphologic study

et al. 2012

View full text Add to dashboard Cite

show abstract

“…This is not the case with nickel over much of the range of solvent concentrations. Clifford and Sargent (5) point out that the addition of KF and NH4F to aqueous solutions of nickel fluoride tends to decrease the solubility, obviating the formation of an anionic species. The present work shows that the solid phases in equilibrium with HF solutions tend to become more green (characteristic of hydrated nickel (II) ion) as the concentration of water increases.…”

Section: He Solubility Of Nickel Fluoride In Anhydrous Hfmentioning

confidence: 99%

Hydrogen Fluoride Solvent System VIII. A Study of the System NiF₂-HF-H₂O.

Clifford¹,

Tulmello²

1963

J. Chem. Eng. Data

Self Cite

View full text Add to dashboard Cite

3M water and less than 39% water. At water concentrations greater than 0.2M, the nickel ion in solution is found to be predominantly hexaquonickel(ll), instability constant = 4.6 x 10At a concentration of water of 39 wt. %, a transition in the solid phase in equilibrium with the solution occurs between an anhydrous form and a dihydrate. A maximum solubility of 2.56M is obtained in 31% HF solutions in water which corresponds to the phase change between this dihydrate and the tetrahydrate previously reported ( 70). The tetrahydrate persists to 100% water. The Ksp 0.006M water was found to be 2 x 10 '.

show abstract