The reduction of gold(III) dithiocarbamates at the mercury electrode

1981 ◽  
Vol 34 (9) ◽  
pp. 1861 ◽  
Author(s):  
M Ahmed ◽  
RJ Magee
Keyword(s):  
Cyclic Voltammetry ◽  
Propylene Carbonate ◽  
Chemical Reaction ◽  
Mercury Electrode ◽  
Carbonate Solution ◽  
Reduction Step ◽  
Diffusion Controlled ◽  
Electron Reduction

The reduction at the mercury electrode of a series of gold(III) dithiocarbamates [Au(S2CNR2)3] in propylene carbonate solution has been investigated by d.c. polarography, cyclic voltammetry and chronoamperometry. ��� Under polarographic conditions, the complexes undergo reduction in a single, diffusion-controlled step. Exhaustive reduction of the complexes at the mercury pool electrode gave non-integral values (3 > n > 2), suggesting the presence of a coupled chemical reaction involving dissociation of the product of the first reduction step. ��� At short electrolysis times (t < 2 s), the slopes of the chronoamperometric i against t-½ plots were typical of two-electron reductions. At longer electrolysis times (t > 4 s), the slopes approached a three-electron reduction. ��� Cyclic voltammetry confirmed that the products resulting from the first reduction are susceptible to dissociation, releasing free dialkyldithiocarbamate anion.

The behaviour of copper(II) dithiocarbamates at the mercury electrode

1976 ◽  
Vol 29 (1) ◽  
pp. 85 ◽  
Author(s):  
TH Randle ◽  
TJ Cardwell ◽  
RJ Magee
Keyword(s):  
Propylene Carbonate ◽  
Electrochemical Techniques ◽  
Mercury Electrode ◽  
Alkyl Substituent ◽  
Reduction Step ◽  
Electron Diffusion ◽  
Reduction Potentials ◽  
Diffusion Controlled

The reduction at the mercury electrode of a series of copper(11) dithiocarbamates [CU(S2CNR2)2] in propylene carbonate has been investigated by a variety of electrochemical techniques. Thecomplexes undergo reduction in two successive one-electron diffusion-controlled steps, with associated adsorption of the complexes and the reduction products. Exhaustive reduction at a mercury-pool electrode shows the completely reduced species [CU(S2CNR2)2]2- to undergo slowdissociation. The alkyl substituent influences the strength of adsorption of the reduction products, the reduction potentials of the complexes and the reversibility of the first reduction step, thesecond step being quasi-reversible in all cases. The electroactive centre appears to be the metal.

scholarly journals Interaction of Calf Thymus DNA with the Ni(II) Complex of Sodium 1,4-Dihydroxy-9,10-Anthraquinone-2-Sulphonate: A Novel Method of Analysis Using Cyclic Voltammetry

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Partha Sarathi Guin ◽  
Piyal Das ◽  
Saurabh Das ◽  
Parikshit Chandra Mandal
Keyword(s):  
Cyclic Voltammetry ◽  
Metal Ion ◽  
Dna Interaction ◽  
Calf Thymus Dna ◽  
Reduction Peak ◽  
Curve Fit ◽  
Diffusion Controlled ◽  
Binding Data ◽  
Calf Thymus ◽  
Electron Reduction

Hydroxy-9,10-anthraquinones are cheaper alternatives to anthracycline drugs. They closely resemble anthracycline drugs both from a structural and functional viewpoint. Electrochemical behavior of the Ni(II) complex (Na2[Ni(NaLH)2Cl2]⋅2H2O) of sodium 1,4-dihydroxy-9,10-anthraquinone-2-sulphonate (NaLH2), analogue of the core unit of anthracycline anticancer drugs, was studied at physiological pH using cyclic voltammetry. The Ni(II) complex of sodium 1,4-dihydroxy-9,10-anthraquinone-2-sulphonate undergoes diffusion-controlled one-electron reduction that enables performing an electrochemical study on the interaction of the complex with calf thymus DNA. The complex was titrated with increasing concentrations of DNA, and the reduction peak for the unbound complex helped in evaluating binding parameters. Analysis of binding data using nonlinear curve fit in a cyclic voltammetry experiment is the first such attempt. The paper evaluates site size of interaction that also serves as a means to determine stoichiometry of complex formation, between a metal ion and ligand from a DNA interaction study, probably a first of its kind.

Electrochemistry of Ruthenium Ammine Complexes

1975 ◽  
Vol 53 (19) ◽  
pp. 2922-2929 ◽  
Author(s):  
C. M. Elson ◽  
I. J. Itzkovitch ◽  
J. McKenney ◽  
John A. Page
Keyword(s):  
Cyclic Voltammetry ◽  
Rate Constants ◽  
Reduction Step ◽  
Methane Sulfonate ◽  
Ammine Complexes ◽  
Chloro Complexes ◽  
First Order ◽  
Order Rate ◽  
Electron Reduction ◽  
Hydrolysis Of

The electrochemistry of ruthenium(III) penta- and tetraammine chloro complexes has been investigated. In each case, the ruthenium(III) species was found to undergo an initial one electron reduction step, followed by hydrolysis of the chloride(s) in the ruthenium(II) product. The rate constants for the substitution steps were evaluated by cyclic voltammetry. An aqueous 0.30 M methane sulfonate electrolyte of pH 2.0 was used at 25 °C.Values for the reversible "E1/2" (V υs. SCE) and first order rate constants for the (stepwise) replacement of the Cl− are: Ru(NH3)5Cl+, −0.282 V and 17 s−1; cis-Ru(NH3)4Cl2+, −0.328 V, 80 s−1, and 5 s−1; trans-Ru(NH3)4Cl2+, −0.412 V, 2 s−1, and 0.4 s−1.The electrochemistry of Ru(NH3)5SO22+was also investigated. In a 0.10 M CH3SO3H – 0.20 M CH3SO3Na electrolyte the ruthenium(II) species was found to undergo an initial one electron oxidation step with "E1/2" = +0.50 V, followed by a slow hydrolysis of the SO2 in the ruthenium(III) product with k = 2.4 × 10−2 s−1 at 25 °C.

scholarly journals Mechanism of Two-/Four-Electron Reduction of Nitroaromatics by Oxygen-Insensitive Nitroreductases: The Role of a Non-Enzymatic Reduction Step

Molecules ◽  
2018 ◽  
Vol 23 (7) ◽  
pp. 1672 ◽  
Author(s):  
Benjaminas Valiauga ◽  
Lina Misevičienė ◽  
Michelle H. Rich ◽  
David F. Ackerley ◽  
Jonas Šarlauskas ◽  
...  
Keyword(s):  
Reduction Step ◽  
Enzymatic Reduction ◽  
Electron Reduction

Cyclic voltammetry with RNA-modified mercury electrode

1994 ◽  
Vol 34 (1) ◽  
pp. 69-76 ◽  
Author(s):  
M. Fojta ◽  
C. Teijeiro ◽  
E. Paleček
Keyword(s):  
Cyclic Voltammetry ◽  
Mercury Electrode

Electrochemical Incorporation of Lithium and Sodium into Carbon Black

1995 ◽  
Vol 60 (7) ◽  
pp. 1158-1161
Author(s):  
Jiří Vondrák
Keyword(s):  
Carbon Black ◽  
Alkali Metal ◽  
Propylene Carbonate ◽  
Carbonate Solution ◽  
Potential Range ◽  
Metal Electrodes

Electrochemical insertion of sodium or lithium into carbon black electrodes from perchlorate-propylene carbonate solution occurs under formation of substances close to C12Na and C6Li in potential range from 1.0 to 0 V vs alkali metal electrodes.

scholarly journals Electrochemical Oxidation of Paracetamol Mediated byMgB2Microparticles Modified Glassy Carbon Electrode

2011 ◽  
Vol 8 (2) ◽  
pp. 553-560 ◽  
Author(s):  
Mohammed Zidan ◽  
Tan Wee Tee ◽  
A. Halim Abdullah ◽  
Zulkarnain Zainal ◽  
Goh Joo Kheng
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Supporting Electrolyte ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Diffusion Controlled ◽  
Scan Rate ◽  
Degree Of Stability ◽  
A Current

A MgB2microparticles modified glassy carbon electrode (MgB2/GCE) was fabricated by adhering microparticles of MgB2onto the electrode surface of GCE. It was used as a working electrode for the detection of paracetamol in 0.1 M KH2PO4aqueous solution during cyclic voltammetry. Use of the MgB2/GCE the oxidation process of paracetamol with a current enhancement significantly by about 2.1 times. The detection limit of this modified electrode was found to be 30 μM. The sensitivity under conditions of cyclic voltammetry is significantly dependent on pH, supporting electrolyte, temperature and scan rate. The current enhancement observed in different electrolytic media varied in the following order: KH2PO4> KCl > K2SO4> KBr. Interestingly, the oxidation of paracetamol using modified GC electrode remain constant even after 15 cycling. It is therefore evident that the MgB2modifiedGCelectrode possesses some degree of stability. A slope of 0.52 dependent of scan rate on current indicates that the system undergoes diffusion-controlled process.

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