Unexpected stabilization of a simple cobalt(I) salt in acetonitrile at a glassy carbon electrode

Buriez, Olivier; Labbé, Éric; Périchon, J.

doi:10.1016/j.jelechem.2006.03.018

Cited by 14 publications

(13 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous study, polyCo exhibits an reversible redox couple in the reduction domain, which is assigned to the electron transfer at the metallic centre of Co(II)/Co(I) . The redox behaviour is dissimilar to our previous study in acetonitrile solution .…”

Section: Resultscontrasting

confidence: 83%

Solvent Effect on Electrochemical Properties of a Co(II)‐Based Metallo‐Supramolecular Polymer Film

Hsu

Zhang

Moriyama

et al. 2016

Macromolecular Symposia

View full text Add to dashboard Cite

Summary: The influence of solvents on the electrochemical properties of a Co(II)-bisterpyridine-based metallo-supramolecular polymer (polyCo) thin films are studied. A redox couple of the polyCo film on GC electrode is observed in the reduction domain due to the redox reaction between Co(II) and Co(I) which belongs to a Nernstian reversible process in aqueous electrolyte solution. While a significant difference on the electrochemical stability of polyCo film is found in the electrolyte solution of organic solvent. A shrinking behaviour of the film is observed after redox switching in acetonitrile solution. The formation of the mixed-ligand of cobalt ion with water molecules as well as the hydrophilic property of the anion enable a stable redox switching of polyCo film in aqueous electrolytes.

show abstract

Section: Resultscontrasting

confidence: 83%

Solvent Effect on Electrochemical Properties of a Co(II)‐Based Metallo‐Supramolecular Polymer Film

Hsu

Zhang

Moriyama

et al. 2016

Macromolecular Symposia

View full text Add to dashboard Cite

show abstract

“…Therefore, it now appeared that there was a broad catalytic activity of Co bisdimethylglyoximate complexes that could be used for analytical purposes. This reactivity could be connected to the electrogeneration of Co(I)(HDMG) 2 species ( E 0 Co(II)/Co(I) <−0.9 V; see also Section 3.5): Co(I) compounds are electron‐rich, unstable and reactive 37–39. These considerations contradicted a mechanism based on a Co(III)/Co(II) cycle which has been previously suggested with NaNO 2 23…”

Section: Resultsmentioning

confidence: 92%

“…The reaction with BrO 3 − appeared to be nondiffusion limited because the ratio i / v 1/2 decreased with increasing scan rate to reach a plateau and i increased linearly with [BrO 3 − ] (Figure 1A). The redox potentials of various Co(II)/Co(I) complexes have been observed in the range of the Co(HDMG) 2 peak 29–32, 37, 41 and Co(I) compounds are known to be catalytically reactive 37–39. Therefore it was likely that a 1e − reduction of Co(II)(HDMG) 2 produced an active Co(I) analogue that was quickly oxidized by BrO 3 − (Scheme ).…”

Section: Resultsmentioning

confidence: 99%

Comparison of Alternate Reactants for pM Level Cobalt Analysis in Seawater by the Use of Catalytic Voltammetry

Baars

Croot

2011

Electroanalysis

View full text Add to dashboard Cite

The analysis of Cobalt (Co) at low pM concentrations in seawater with Adsorptive Cathodic Stripping Voltammetry involves high concentrations of sodium nitrite (NaNO2) to enhance the signal in an electrocatalytic reaction. In this study we found three substitutes for NaNO2 that critically affected the sensitivity. Optimisation of a method with potassium bromate (KBrO3) resulted in an excellent detection limit (0.9 pM) after a 90 s adsorption period. Reactant concentration and consumption were 10× reduced compared to protocols with NaNO2 and reagent blanks were lower. Accuracy and precision were verified with SAFe intercalibration standards and the method was applied using open ocean seawater samples. The reaction mechanism is discussed and differences to NaNO2 are shown.

show abstract

“…Actually, the glassy carbon working electrode acts as a stabilizing surface with the advantage of being specific to cobalt cations. Another advantage lies in the fact that the electrochemical formation of Co 0 species could be evidenced for the first time on the time‐scale of slow cyclic voltammetry (−1.16 V/SCE at 100 mV/s) and in the absence of any added co‐solvent or ligand.…”

Section: Electrochemical Determination Of the Redox State Stability mentioning

confidence: 99%

Fundamental Input of Analytical Electrochemistry in the Determination of Intermediates and Reaction Mechanisms in Electrosynthetic Processes

Labbé

Buriez

2019

ChemElectroChem

Self Cite

View full text Add to dashboard Cite

Electroanalytical techniques like cyclic voltammetry allow convenient and fast identification of the redox status and stability of intermediates generated at electrodes in electrosynthetic processes. Accordingly, reliable mechanistic features can also be derived from the electrochemical characterization of the reactive species, and in some cases, complete and complex mechanisms can be disclosed. This Minireview highlights some representative examples taken from metal‐catalyzed electro‐reductive processes where simple electrochemical approaches provide essential information on the nature and the fate of the species formed. A special focus is made on cobalt‐promoted electrosynthetic processes, owing to the broad range of situations they display towards the stability of electrogenerated species, their reactivity, and the possible follow‐up reactions.

show abstract

Unexpected stabilization of a simple cobalt(I) salt in acetonitrile at a glassy carbon electrode

Cited by 14 publications

References 30 publications

Solvent Effect on Electrochemical Properties of a Co(II)‐Based Metallo‐Supramolecular Polymer Film

Solvent Effect on Electrochemical Properties of a Co(II)‐Based Metallo‐Supramolecular Polymer Film

Comparison of Alternate Reactants for pM Level Cobalt Analysis in Seawater by the Use of Catalytic Voltammetry

Fundamental Input of Analytical Electrochemistry in the Determination of Intermediates and Reaction Mechanisms in Electrosynthetic Processes

Contact Info

Product

Resources

About