Detection of interaction between redox centers of surface confined molecules by means of Cyclic Voltammetry and Differential Staircase Voltcoulommetry

González, Joaquı́n; Molina, Á.; Soto, Carmen M.; Serna, Carmen

doi:10.1016/j.jelechem.2011.10.013

Cited by 14 publications

(38 citation statements)

References 33 publications

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“…Figure 1b shows that the values of the peak height, ψ peak , for an EE process, change with ΔE 0 ′ between 1/4 (for ΔE 0 ′ ≪ 0) and 1 (for ΔE 0 ′ ≫ 0), as expected, since the normalized current for an E mechanism Table 2. Analytical Expressions for the Roots with Physical Meaning (E peak , E valley ) of the Derivative of the Normalized Current, ψ, for the EE and E+E Mechanisms (eqs 31 or 41, and 43, Respectively) 33,36 , a a K is given by eqs 12 and 42 for the EE and the E+E mechanisms, respectively. Note that peak potentials in dNPV (solution-soluble species) and CV (surface-confined species) correspond to the half-wave potentials in NPV 1,14 and charge-based techniques, 33 with n electrons transferred is ψ E,peak = n 2 /4; 1,2 thus, 1/4 for n = 1 and 1 for n = 2.…”

Section: Resultsmentioning

confidence: 99%

“…(1) For ΔE 0 ′ ≤ − 142.4 mV (K ≤ 1/2 8 ) the two peak potentials in the voltagram (for both EE and E+E mechanisms) correspond to the individual formal potentials, E 1 0 ′ and E 2 0 ′ (see the superposition of red and dashed black lines in Figure 1a), and ψ peak = 1/4 (see Figure 1b and eqs 33 and 34), both peak parameters being characteristic of a simple E mechanism, although the value W 1/2 = 90 mV is only obtained for ΔE 0 ′ ≤ −200 mV (see Figure 1c). 1,33 (2) For ΔE 0 ′ = −71.2 mV (K = 1/2 4 ) in the EE mechanism and ΔE 0 ′ = −67.7 mV (K = (7−4√3)) in the E+E mechanism (i.e., with a difference of 3.56 mV), the transition 2 peaks−1 peak takes place (see Figure 1a), obtaining in both cases identical ψ − E curves, with ψ peak = 1/3 (see Figure 1b and eqs 32 and 44) and W 1/2 = 143.8 mV ≈ 2|ΔE 0 ′| EE (Figure 1c). 14,18,32,33,36 For more positive values of ΔE 0 ′, only one peak appears in the response, whose peak potential corresponds to E̅ 0 ′ (see Figure 1a) and whose peak heights are given by eqs 32 for the EE mechanism and 44 for the E+E one.…”

Section: Resultsmentioning

confidence: 99%

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Two-Electron Transfer Reactions in Electrochemistry for Solution-Soluble and Surface-Confined Molecules: A Common Approach

2014

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In this paper, the general characteristics of the normalized voltammetric response for reversible two-electron transfer reactions (EE mechanism) is analyzed and particularized to the application of derivative normal pulse voltammetry (dNPV) using electrodes of any geometry and size, and cyclic voltammetry (CV), when the molecule undergoing the process is soluble in solution and surface-confined, respectively. The analysis is based on the close relationships between the electrochemical response and the theoretical values of surface concentrations/excesses, and has led to the voltammetric signal of the EE mechanism being interpreted in terms of the percentage of E 1e − E 1e − , and E 2e − character, as a function of the difference between the formal potentials of both electron transfers, ΔE 0 ′ = E 2 0 ′ − E 1 0 ′. In line with the percentage of E 2e − character, the term "effective electron number", n eff , has been introduced and related to the probability of the second electron being transferred in an apparently simultaneous way with the first one and a direct method to obtain the values of E 1 0 ′ and E 2 0 ′ for any ΔE 0 ′ has been proposed. The key role of ΔE 0 ′ (in mV, 25 °C) = −142.4, −71.2, −35.6, and 0 values in the behavior of the peak parameters of the voltammetric curves is explained in terms of the usual terminology (transition 2 peaks−1 peak, repulsive− attractive interactions, anticooperativity−cooperativity, and normal-inverted order of potentials). The EE mechanism is also compared with two independent E mechanisms (E+E).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Two-Electron Transfer Reactions in Electrochemistry for Solution-Soluble and Surface-Confined Molecules: A Common Approach

2014

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“…The small sample detection <1.0ml using platinum electrodes (designed and made by our laboratory). The platinum electrodes including a working electrode (platinum electrode), an opposing electrode (platinum electrode), and a reference electrode (Ag-AgCl electrode) used for cyclic voltammetry measurement (16).…”

Section: Electrode and Apparatusmentioning

confidence: 99%

Molecular characterization of fertile hydatid cysts from the liver of the sheep and cows and associated environmental influence factors

Abdulla¹,

Mageed²,

Obed³

et al. 2020

IJVS

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The aim of the study is characterizing of hydatid cysts that have been isolated from sheep and cow liver fertile hydatid cysts using mitochondrial cytochrome c oxidase subunit 1(cox1) gene. DNA samples of nineteen sheep and one cow were extracted from protoscoleces and germinal layers of the parasites in Koya city-Erbil, Iraq, using specific extraction procedures. Mitochondrial cox1 gene region was amplified by polymerase chain reaction (PCR), and the expected gene sizes were confirmed by gel electrophoresis. All DNA isolates were then sequenced. Nucleotide sequence alignments were then performed to verify the sequenced isolated according to the database, which showed that all samples were belonging to the (G1) sheep strain. Phylogenetic analysis was also carried out for the sequenced isolated to find out the highest similarities with closest organisms to E. granulosus' conserved gene and to reveal sharing common ancestor, which has been confirmed. Electrocatalytic reduction of DNA where detected through applying cyclic-voltammetry technique, which referred to the environmentally strong protection features of these strains against any effects of external factors, such as heavy metals and has revealed the secret behind the potent preservation of the DNA structure of this parasite from being affect by mutations, or alterations, along the different lineages over a long period of time.

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“…Study of confined molecules has also been an area of interest. There have been various theoretical [218,219] as well as experimental [220,221] studies regarding confined molecules. Inertially confined molecular ions interacting with strong laser pulses can be a very efficient source of high-order harmonics.…”

Section: Effect Of Confinement On Chemical Reactivitymentioning

confidence: 99%

Density dynamics in some quantum systems

Khatua

Chakraborty

Chattaraj

2013

Int J of Quantum Chemistry

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The quantum domain behavior of classical nonintegrable systems is well-understood by the implementation of quantum fluid dynamics and quantum theory of motion. These approaches properly explain the quantum analogs of the classical Kolmogorov-Arnold-Moser type transitions from regular to chaotic domain in different anharmonic oscillators. Field-induced tunneling and chaotic ionization in Rydberg atoms are also analyzed with the help of these theories.Quantum fluid density functional theory may be used to understand different time-dependent processes like ion-atom/ molecule collisions, atom-field interactions, and so forth. Regioselectivity as well as confined atomic/molecular systems and their reactivity dynamics have also been explained.

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Detection of interaction between redox centers of surface confined molecules by means of Cyclic Voltammetry and Differential Staircase Voltcoulommetry

Cited by 14 publications

References 33 publications

Two-Electron Transfer Reactions in Electrochemistry for Solution-Soluble and Surface-Confined Molecules: A Common Approach

Two-Electron Transfer Reactions in Electrochemistry for Solution-Soluble and Surface-Confined Molecules: A Common Approach

Molecular characterization of fertile hydatid cysts from the liver of the sheep and cows and associated environmental influence factors

Density dynamics in some quantum systems

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