Electrochemistry of coupled electron-ion transfer of a heme-like complex in an artificial organic membrane

Mirčeski, Valentin; Dzimbova, Tatyana; Sefer, Birhan; Krakutovski, Gjorgji

doi:10.1016/j.bioelechem.2009.09.006

Cited by 5 publications

(4 citation statements)

References 48 publications

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“…Figure 5 shows the R2 and O2 peak currents and scan rate normalized peak currents as functions of the scan rate. The observed behavior is very similar to what has been reported by Mirceski et al [33] for a coupled electron-ion transfer driven by a heme-like complex in a supported thin organic layer, pointing to some similarities with the process here described. The non linear decrease on the absolute value of the scan rate normalized R2 peak current when the scan rate is increased and the trend followed by the absolute value of the peak current indicate that the compound being reduced is produced by a previous chemical reaction, i.e., the reaction follows a CE mechanism.…”

Section: Effect Of Hydrophobic Quaternary Ammonium Salts In the Electsupporting

confidence: 90%

“…The complexity and number of the interfaces involved, the several chemical and electrochemical reaction pathways leading from UQ to UQH 2 and viceversa, and the rather slow rate of the electron and proton transfer reactions, result in a wide set of possible behaviors, as shown in a number of publications. The system shares features with the redox driven ion transfer reactions observed on thin-film membranes [33] and three-phase junctions [39] while, at the same time, it can behave as an adsorbed system.…”

Section: Discussionmentioning

confidence: 71%

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Ubiquinone-10 in gold-immobilized lipid membrane structures acts as a sensor for acetylcholine and other tetraalkylammonium cations

Mårtensson

Hernández

2012

Bioelectrochemistry

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This is an accepted version of a paper published in Bioelectrochemistry. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the published paper: Mårtensson, C., Agmo Hernańdez, V. (2012 AbstractIt is reported that the reduction of ubiquinone incorporated into supported lipid bilayers and into immobilized liposome layers on gold electrodes is kinetically and thermodynamically enhanced by the presence of acetylcholine and tetrabutylammonium (TBA + ) in solution. The reduction peak and the mid-peak potentials of the redox reactions, determined by cyclic voltammetry, are displaced towards more positive potentials by approximately 500 and 250 mV, respectively, in the case of TBA + ; and by approximately 750 and 530 mV, respectively, in the case of acetylcholine. The intensity of the signal varies with the cation concentration, allowing for quantitative determinations in the millimolar range. It is proposed that the enhanced reduction of ubiquinone arises from the formation of tetraalkylammonium cationubiquinone radical anion ion-pairs. Electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) measurements confirmed that the potential shift and the intensity of the redox signal are coupled with the adsorption of the tetraalkylammonium cations on the lipid membrane. The Langmuir adsorption equilibrium constant (K) of TBA + on lipid membranes at physiological pH is determined. In supported lipid bilayers K = 440.7 ± 160 M -1 , while in an immobilized liposome layer K = 35.53 ± 3.53 M -1 . 1

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Section: Effect Of Hydrophobic Quaternary Ammonium Salts In the Electsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 71%

Ubiquinone-10 in gold-immobilized lipid membrane structures acts as a sensor for acetylcholine and other tetraalkylammonium cations

Mårtensson

Hernández

2012

Bioelectrochemistry

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“…The last decade has been also marked by important contributions of SWV in studying the charge transfer processes across liquid/liquid interfaces (L/L) [35,48,55,[68][69][70][71][72][73][74][75][76][77][78][79][80]. Most of these studies are related with thin-organic film [70, 73-76, 78, 79] and three-phase electrodes [71,72,77].…”

Section: Electrode Mechanisms Studied With Swvmentioning

confidence: 99%

Square‐Wave Voltammetry: A Review on the Recent Progress

et al. 2013

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A review on the recent progress of square-wave voltammetry is presented, covering the period of the last five years. The review addresses the new theoretical development of the technique as well as its application for mechanistic purposes, electrode kinetic measurements, biochemical and analytical applications. Besides, a few novel methodological modifications are proposed that might expand the scope and application of the technique.

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“…4B). Several new redox systems (for example phthalocyanato metal complexes, 77,78 porphyrinato metal complexes, [79][80][81] N,N-butyldecamethylferrocenyl-amine 82 ) have now been developed with inert and sufficiently hydrophobic character suited for ion transfer voltammetry in triple phase boundary systems. An inverse triple phase boundary system based on water microdroplets has also been demonstrated 83 and metal deposition within the microdroplets resulted in the formation of intriguing ring features following the line junction.…”

Section: Red(oil) + Amentioning

confidence: 99%

Ion-transfer- and photo-electrochemistry at liquid|liquid|solid electrode triple phase boundary junctions: perspectives

Marken

Watkins

Collins

2011

Phys. Chem. Chem. Phys.

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Ion transfer at liquid|liquid junctions is one of the most fundamental processes in nature. It occurs coupled to simultaneous electron transfer at the line junction (or triple phase boundary) formed by the two liquids in contact to an electrode surface. The triple phase boundary can be assembled from a redox active microdroplet deposit of a water-immiscible liquid on a suitable electrode surface immersed into aqueous electrolyte. Ion transfer voltammetry measurements at this type of electrode allow both thermodynamic and kinetic parameters for coupled ion and electron transfer processes to be obtained. This overview summarises some recent advances in understanding and application of triple phase boundary redox processes at organic liquid|aqueous electrolyte|working electrode junctions. The design of novel types of electrodes is considered based on (i) extended triple phase boundaries, (ii) porous membrane processes, (iii) hydrodynamic effects, and (iv) generator-collector triple phase boundary systems. Novel facilitated ion transfer processes and photo-electrochemical processes at triple phase boundary electrodes are proposed. Potential future applications of triple phase boundary redox systems in electrosynthesis, sensing, and light energy harvesting are indicated.

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Electrochemistry of coupled electron-ion transfer of a heme-like complex in an artificial organic membrane

Cited by 5 publications

References 48 publications

Ubiquinone-10 in gold-immobilized lipid membrane structures acts as a sensor for acetylcholine and other tetraalkylammonium cations

Ubiquinone-10 in gold-immobilized lipid membrane structures acts as a sensor for acetylcholine and other tetraalkylammonium cations

Square‐Wave Voltammetry: A Review on the Recent Progress

Ion-transfer- and photo-electrochemistry at liquid|liquid|solid electrode triple phase boundary junctions: perspectives

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