Electrode kinetics of surfactant polypyridine osmium and ruthenium complexes confined to tin oxide electrodes in a monomolecular layer by the Langmuir-Blodgett method

Daifuku, Hideharu; Aoki, Koichi; Tokuda, Koichi; Matsuda, Hiroaki

doi:10.1016/0368-1874(85)85478-2

Cited by 81 publications

(47 citation statements)

References 31 publications

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“…Therefore, not all the expected UQ confined redox centres have been reduced during the period of potential scan, and an electroactive fraction is calculated. Similar behaviour has also been observed by Laval et al [19], studying UQ reduction and in other LB redox systems [36,37] and is explained due to different factors: a non homogeneous electrode surface, a non homogeneous distribution of the redox centres in the film where not all the sites are equivalent or where some redox centres are not in direct contact with the electrode surface. In our case we attribute this behaviour to the use of an ITO electrode which presents semiconductive properties and then behaves different than metal electrodes as gold or mercury.…”

Section: Discussionsupporting

confidence: 59%

“…The shape of the voltammograms shown in Figures 4-6 presents important deviations respect to an ideal reversible system, according to the theoretical models proposed in the literature to describe the cyclic voltammetric response of a surface confined reaction [34][35][36]. Main features are that the peak shape is not symmetrical, being the reduction peaks sharper than the oxidation ones, and that the separation between reduction an oxidation peak potentials is large.…”

Section: Discussionmentioning

confidence: 99%

“…Main features are that the peak shape is not symmetrical, being the reduction peaks sharper than the oxidation ones, and that the separation between reduction an oxidation peak potentials is large. Such deviations are attributed [36,37] to the interactions between the electroactive centres, to the not homogeneous spatial distribution of the centres and to the non-equivalent sites in the film.…”

Section: Discussionmentioning

confidence: 99%

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Electrochemical behaviour of mixed LB films of ubiquinone – DPPC

Hoyo

Guaus

Torrent‐Burgués

et al. 2012

Journal of Electroanalytical Chemistry

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The structure and the electrochemical behaviour of Langmuir and Langmuir-Blodgett (LB) films of the biological ubiquinone-10 (UQ) and a mixture of dipalmytoilphosphatidylcholine (DPPC) and UQ at the molar ratios DPPC:UQ 5:1 and 10:1 have been investigated. The surface pressure-area isotherms of the Langmuir films and the AFM images of the LB films show the formation of a monolayer in the DPPC:UQ mixture till a certain surface pressure is attained, and then at higher surface pressures the UQ is progressively expelled. The cyclic voltammograms of DPPC:UQ LB films formed on indium tin oxide, ITO, at different surface pressures show one reduction and one oxidation peak at low surface pressures, but two or even more reduction and oxidations peaks at medium and high surface pressures. The electrochemical behaviour is correlated with the film structure.

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Section: Discussionsupporting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Electrochemical behaviour of mixed LB films of ubiquinone – DPPC

Hoyo

Guaus

Torrent‐Burgués

et al. 2012

Journal of Electroanalytical Chemistry

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“…Interaction effects have been discussed in detail by Brown and Anson [22], Albery and Colby [23], Laviron [24] and by Tokuda and co-workers [25,26]. A recent summary of work in this area has been provided by Lyons [1].…”

Section: Chronoamperometric Response Of Surface Immobilized Redox Gromentioning

confidence: 99%

Mediated Electron Transfer at Redox Active Monolayers Part 2 : Analysis of the Chronoamperometric Response to a Potential Step Perturbation

Lyons

2002

Sensors

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A theoretical model describing the transport and kinetic processes involved in heterogeneous redox catalysis of solution phase reactants at electrode surfaces coated with redox active monolayers is presented. We describe theoretically the time dependent chronoamperometric response expected for a redox active monolayer in the absence of a substrate in solution, and subsequently extend the analysis to consider the reaction of a solution phase substrate mediated by surface immobilized redox groups. This is accomplished via a Laplace transform based solution of the Fick diffusion equation for the substrate transport to the monolayer surface coupled with the development of a suitable flux matching condition at the monolayer/solution interface . The latter procedure enables the development of an analytical expression for the transient current response in terms of well established mathematical special functions. We have shown that kinetic information may be readily extracted from the developed expressions for the current response as a function of time. In the present paper we assume that the reaction between mediator and substrate is of a simple outer sphere bimolecular type.

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“…[14,15] The value of k s is obtained from the equation, k = anFv c /RT = (1-a)nFv a /RT, and is (1.7 AE 0.07) 10 2 s À1 . The scan rate corresponding to the intersection point of the two asymptotes, v a = v c is obtained from Figure 5a.…”

mentioning

confidence: 99%

Neutral Nickel(II) and Copper(II) Tetraazamacrocyclic Complexes as Molecular Rods Attached to Gold Electrodes

Wawrzyniak

Woźny

Kowalski

et al. 2008

Chemistry A European J

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New dithiolated derivatives of neutral Cu(II) and Ni(II) tetraazamacrocyclic complexes have been synthesized and characterized by spectroscopic and diffractional methods. These rod-shaped molecules were assembled in monocomponent and mixed monolayers on gold electrodes. In the mixed monolayers, the active molecules were embedded in a hexanethiol matrix. The dithiolated complexes are oriented perpendicularly to the electrode, and reveal faster kinetics of electron transfer than those assembled in a single-component monolayer. They appear as protrusions, which are easily addressed by using the STM method. In the presence of a suitable electron acceptor in the solution, the donor properties of the anchored Cu complex were weakened, which revealed donor-acceptor interactions with the monolayer. The peak position in the voltammogram indicates a stronger interaction of the solution-based acceptor with the reduced Cu(II) form than with the Cu(III) complex. This suggests the possibility of switching the association on or off by applying an appropriate potential.

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Electrode kinetics of surfactant polypyridine osmium and ruthenium complexes confined to tin oxide electrodes in a monomolecular layer by the Langmuir-Blodgett method

Cited by 81 publications

References 31 publications

Electrochemical behaviour of mixed LB films of ubiquinone – DPPC

Electrochemical behaviour of mixed LB films of ubiquinone – DPPC

Mediated Electron Transfer at Redox Active Monolayers Part 2 : Analysis of the Chronoamperometric Response to a Potential Step Perturbation

Neutral Nickel(II) and Copper(II) Tetraazamacrocyclic Complexes as Molecular Rods Attached to Gold Electrodes

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