Square-wave voltammetry of copper–phenanthroline–tributylphosphate complex

Mlakar, Marina; Čuljak, Ivan; Branica, Marko

doi:10.1039/an9941902443

“…The separation of the peak potentials intensifies with the enhancement of the SW amplitude. Such a behavior evidently confirms the reversibility of the Cu(II)-SA complex redox process [24][25][26][27].…”

Section: Mechanism Of the Cu(ii)-sa Redox Reactionsupporting

confidence: 71%

Influence of the HEPES Buffer on Electrochemical Reaction of the Copper(II)-Salicylaldoxime Complex

Cuculić

¹

,

Mlakar

²

,

Branica

³

1998

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The effect of the 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) on the redox process of copper(II)-salicylaldoxime complex [Cu(II)-SA] was studied. The measurements were performed on a hanging mercury drop electrode (HMDE) using various electrochemical techniques. The presence of the HEPES buffer (pH 8.0) doubled the reduction current of the Cu(II)-SA complex, whereas the reduction potential shifted to more positive values (about 50 mV). The results obtained indicate that the presence of the HEPES buffer facilitates the electron transfer between the mercury electrode and the adsorbed Cu(II)-SA complex during the reduction process. The experiments carried out using chronocoulometry with a double step potential revealed that the surface coverage of the Cu(II)-SA complex remained unchanged (in the range between 9 and 10.5 × 10 ¹11 mol cm ¹2 ), regardless of the presence of the HEPES buffer. Square-wave voltammetric measurements also indicate that the redox process of the Cu(II)-SA complex is electrochemically reversible with the reactant adsorption, in spite of the presence of the HEPES buffer.

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“…The separation of the peak potentials intensifies with the enhancement of the SW amplitude. Such a behavior evidently confirms the reversibility of the Cu(II)-SA complex redox process [24][25][26][27].…”

Section: Mechanism Of the Cu(ii)-sa Redox Reactionsupporting

confidence: 58%

Influence of the HEPES Buffer on Electrochemical Reaction of the Copper(II)-Salicylaldoxime Complex

́¹,

Mlakar²,

Branica³

1998

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The effect of the 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) on the redox process of copper(II)-salicylaldoxime complex [Cu(II)-SA] was studied. The measurements were performed on a hanging mercury drop electrode (HMDE) using various electrochemical techniques. The presence of the HEPES buffer (pH 8.0) doubled the reduction current of the Cu(II)-SA complex, whereas the reduction potential shifted to more positive values (about 50 mV). The results obtained indicate that the presence of the HEPES buffer facilitates the electron transfer between the mercury electrode and the adsorbed Cu(II)-SA complex during the reduction process. The experiments carried out using chronocoulometry with a double step potential revealed that the surface coverage of the Cu(II)-SA complex remained unchanged (in the range between 9 and 10.5 × 10 ¹11 mol cm ¹2 ), regardless of the presence of the HEPES buffer. Square-wave voltammetric measurements also indicate that the redox process of the Cu(II)-SA complex is electrochemically reversible with the reactant adsorption, in spite of the presence of the HEPES buffer.

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“…It is significant that the oxidation of Cu(I) or Cu(II) to Cu(III) (3d 8 ) is accompanied by a drastic change in ionic radii of the copper atom . Notably, the success of copper complexes as a catalyst relied on the abilities of various nitrogen and oxygen containing ligands in stabilizing copper in its various oxidation states and also in enhancing its solubility, thereby making the entire catalytic process homogeneous and effective. ,, The measurement of the half wave potential ( E 1/2 ) of various copper complexes with the aid of cyclic voltammetry (CV) showed that the most common redox reactions of copper complexes are one electron (Cu 2+ ↔ Cu + , and Cu + ↔ Cu) and two electron (Cu 2+ ↔ Cu) processes along with the redox reactions of electroactive ligands . In addition, disproportionation reactions of Cu(I) complexes to Cu(0) and Cu(II) species were also recognized using operando IR spectroscopy …”

Section: Introductionmentioning

confidence: 99%

Copper-Mediated C–X Functionalization of Aryl Halides

Joseph¹,

Priyadarshini

²

2017

Org. Process Res. Dev.

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For more than a century, copper has been used as a promoter in cross-coupling reactions of aryl halides with diverse nucleophiles to construct C−C and C-heteroatom bonds. The discovery of rate acceleration effect of organic ligands has expanded the scope of copper catalysis, facilitating to conduct new reactions under ambient conditions, allowing the selective C−X functionalization of aryl halides with diverse sensitive functionalities in a single step. This review confers the advancements in copper-mediated direct transformation of aryl halides in to trifluoromethylated arenes, aryl nitriles, phenols, aryl thiols, anilines, and nitroarenes and also the mechanistic aspects of these reactions.

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Square-wave voltammetry of copper–phenanthroline–tributylphosphate complex

Cited by 11 publications

References 24 publications

Influence of the HEPES Buffer on Electrochemical Reaction of the Copper(II)-Salicylaldoxime Complex

Influence of the HEPES Buffer on Electrochemical Reaction of the Copper(II)-Salicylaldoxime Complex

Influence of the HEPES Buffer on Electrochemical Reaction of the Copper(II)-Salicylaldoxime Complex

Copper-Mediated C–X Functionalization of Aryl Halides

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