Electrochemistry of bipyridyl derivatives of cobalt in solutions of anionic and cationic micelles

Kamau, Geoffrey N.; Leipert, Thomas K.; Shukla, Shyam S.; Rusling, James F.

doi:10.1016/0022-0728(87)85014-3

Cited by 72 publications

(32 citation statements)

References 26 publications

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“…The changes of the redox parameters are attributed to a surface effect, i.e., it is well established that surfactants in a solution promote aggregation as well as the adsorption and organization on the electrode surface to form surfactant films. 26,[29][30][31] In order to investigate that the films of CPC adsorbed on the electrode surface are the responsible for the electrochemical behavior observed in the presence of CPC, an investigation of preparing the film using concentrated CPC solution was carried out. The film was prepared in a concentrated CPC solution (1.0 mol L -1 ) before the measurement.…”

Section: Resultsmentioning

confidence: 99%

Simple and Sensitive Electroanalytical Method for the Determination of Ascorbic Acid in Urine Samples Using Measurements in an Aqueous Cationic Micellar Medium

et al. 2008

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Section: Resultsmentioning

confidence: 99%

Simple and Sensitive Electroanalytical Method for the Determination of Ascorbic Acid in Urine Samples Using Measurements in an Aqueous Cationic Micellar Medium

et al. 2008

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“…It is well known that surfactants can be adsorbed on the electrode surfaces to form surfactant film [17,18], which may alter the overvoltage of the electrode reaction and influence the rate of electron transfer. In this medium system, the following assumption should be reasonable.…”

Section: The Voltammetric Behaviors Of Tcmentioning

confidence: 99%

Sensitivity Improvement of the Oxidation of Tetracycline at Acetylene Black Electrode in the Presence of Sodium Dodecyl Sulfate

Dang¹,

Hu²,

Wei³

et al. 2004

Electroanalysis

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The oxidation of tetracycline (TC) was investigated at an acetylene black electrode in the presence of sodium dodecyl sulfate (SDS). TC exhibited a sensitive oxidation peak in the medium system, which was attributed to the enhanced adsorption of protonated TC at the negatively charged SDS film on the electrode surface. The mechanism of the electrode process was discussed, and some experimental conditions were optimized. The oxidation peak current was proportional to TC concentration in the range of 1.2 Â 10 À7 -6.0 Â 10 À5 M, and based on three times the background signal, a detection limit of 1.2 Â 10 À8 M was obtained for 150 s accumulations. The method has been used to determine TC in honey and pharmaceutical, and the results compared favorably.

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“…Moreover, reduction of related porphyrins is also well established. In addition, our earlier work indicated that reduction of ally halides to 1,5-hexadiene at glassy carbon electrodes was catalyzed by tris(2,2 0 -bipyridyl)cobalt(II) and tris (4,4 0 -dimethyl-2,2 0 -bipyridyl)cobalt(II) in both aqueous micellar solutions and nonaqueous solutions [8][9][10]. Moreover, electrode reactions of copper and nickel phthalocyaninetetrasulfonates (MPcTS) demonstrated enhanced signals for catalytic reduction of organohalides in bicontinuous microemulsion and isotropic media [5,6].…”

Section: Introductionmentioning

confidence: 97%

“…It was against this background that the LH ligand is unique in the sense that it is a stable ligand radical, capable of forming metal compounds of special interest, with possible electrocatalyses, that we set out to study the electrode properties of both the metal free ligand and the ligand-metal complexes. In continued search of catalysts, capable of amplifying signals and lowering of electrode potential for detection and decomposition of organohalides, it is hoped that M-LH may exhibit catalytic properties comparable to those studied earlier [5,6,[8][9][10]]. …”

Section: Introductionmentioning

confidence: 97%

Voltammetric Studies of the Reactions of Imidazolidine Nitroxyl Free Radical with Vanadium Pentoxide, Chromium(III) Acetate and Manganese(III) Acetylacetonate

1998

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This work demonstrated the synthesis and voltammetric studies of imidazolidine nitroxyl free radical (LH) complexes of chromium, manganese and vanadium. Half-wave potentials of solutions containing the three metal-LH as well as the metal free ligand (LH) ranged between ¹0.18 and ¹0.20 V (vs. Ag/AgCl) for the reduction process. At a potential window ranging from ¹0.10 to þ1.00 V no oxidation peak was observed for LH. However, LH accepts an electron readily, leading to both forward and reverse peaks. It is not clear whether the added electron pairs up with the unpaired electron on the ligand radical or possibly forms an ion radical. On the other hand Cr-LH, Mn-LH and V-LH solutions undergo oxidation within the same potential range. A value of n ranging from 0.62 to 1.2 was obtained from a plot of E app versus log[i/i d -i], which gave linear relationship for the reduction of the four solutions, suggesting fast electron transfer from the electrode to the M-LH or metal free ligand. Reduction of the three metal-ligand solutions exhibited certain degree of electrode reversibility depending on the scan rate. Absence of an anodic peak at low scan rates suggested fast electron transfer followed by a homogeneous chemical reaction (EC mechanism), which removed the oxidized species from the surface of the electrode. The pseudo-first-order rate constants for the M-LH anion radical ranged from 0.025 to 0.087 s ¹1 . Overall, k f increased in the order: V-LH < Cr-LH < Mn-LH.

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Electrochemistry of bipyridyl derivatives of cobalt in solutions of anionic and cationic micelles

Cited by 72 publications

References 26 publications

Simple and Sensitive Electroanalytical Method for the Determination of Ascorbic Acid in Urine Samples Using Measurements in an Aqueous Cationic Micellar Medium

Simple and Sensitive Electroanalytical Method for the Determination of Ascorbic Acid in Urine Samples Using Measurements in an Aqueous Cationic Micellar Medium

Sensitivity Improvement of the Oxidation of Tetracycline at Acetylene Black Electrode in the Presence of Sodium Dodecyl Sulfate

Voltammetric Studies of the Reactions of Imidazolidine Nitroxyl Free Radical with Vanadium Pentoxide, Chromium(III) Acetate and Manganese(III) Acetylacetonate

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