Direct electrochemistry of dinuclear CuA fragment from cytochrome c oxidase of Thermus thermophilus at surfactant modified glassy carbon electrode

Rajbongshi, Jitumani; Das, Diganta Kumar; Mazumdar, Shyamalava

doi:10.1016/j.electacta.2010.02.045

Cited by 26 publications

(10 citation statements)

References 42 publications

(53 reference statements)

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“…Prior to every experiment, the glassy carbon electrode surface was cleaned as reported. 20 The surfactant solutions used were 3% (w/v) sodiumdodecyl sulphate (SDS), triton X-100 (TX-100), and cetyltrimethylammonium bromide (CTAB) in DMF. To fabricate [Fe 4 Se 4 (SPh) 4 ] 2− -encapsulated CTAB film on the glassy carbon electrode surface, we prepared five 1 mmol/L solutions (each of 2 mL) of [Fe 4 Se 4 (SPh) 4 ] 2− containing 0.55, 1.10, 1.65, 2.20, and 2.75 × 10 −4 mol of CTAB.…”

Section: Methodsmentioning

confidence: 99%

Significant effect of charge microenvironment on the redox potential of [Fe₄Se₄(SPh)₄]²⁻ in solution and inside film

2014

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Through this work, we have shown that both the nature and the compactness of charge of the microenvironment around the [Fe 4 Se 4 (SPh) 4 ] 2−/3− couple are important in determining its redox potential. The redox potential of the [Fe 4 Se 4 (SPh) 4 ] 2−/3− couple has been measured in pure dimethylformamide (DMF), DMF added with surfactants of different charges, and also in positive surfactant film on an electrode surface. The redox potential becomes 0.090 V positive when the solution microenvironment is made positive compared to that in DMF. On the other hand, if the microenvironment is made positive and static (in the form of a positive film), the positive shift in the potential is 0.265 V, and compactness of charge induced an extra 0.175 V positive shift in the potential. Résumé : À travers cette étude, nous avons démontré que la nature et la concentration de la charge du microenvironnement entourant le couple [Fe 4 Se 4 (SPh) 4 ] 2−/3− étaient importante dans la détermination de son potentiel redox. Le potentiel d'oxydoréduction du couple [Fe 4 Se 4 (SPh) 4 ] 2−/3− a été mesuré dans du diméthylformamide (DMF) pur, auquel des surfactants de différentes charges ont été ajoutés, ainsi que le film de surfactant chargé positivement recouvrant la surface d'électrodes. Le potentiel redox augmente de 0,090 V lorsque le micro-environnement de la solution devient positif par rapport à celui dans le DMF. Par ailleurs, si le micro-environnement est devient positif et statique (sous la forme d'un film chargé positivement), la variation positive du potentiel est égale à 0,265 V et la concentration de charge entraînant une variation supplémentaire positive de potentiel de 0,175 V. [Traduit par la Rédaction]

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Section: Methodsmentioning

confidence: 99%

Significant effect of charge microenvironment on the redox potential of [Fe₄Se₄(SPh)₄]²⁻ in solution and inside film

2014

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“…The electrodes were cleaned as per reported procedure. 30 Electron paramagnetic resonance (EPR) spectra were recorded on a Bruker EMX spectrometer (centre field 0.4 T, sweep width 0.8 T, resolution 1024 points, microwave frequency 9.877×109 Hz, power 0.188 mW). Magnetic susceptibility measurements were performed at ambient temperature by the Gouy method using a Cambridge magnetic balance (UK), LC-MS data were recorded in Agilent LCMS 6410 Series (USA).…”

Section: Methodsmentioning

confidence: 99%

Synthesis, characterization and superoxide dismutase activity of bi-copper(II)-bisacetato- μ−phthalicacid[bis(benzyloxy)ethyl]ester

2015

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A new binuclear copper(II) complex, bridged by the ligand phthalicacid[bis(benzyloxy)ethyl]ester, where each copper(II) is coordinated to one carboxylate (from ligand) and one acetate in square planar mode is reported. The ligand synthesized by the reaction of phthalic anhydride and ethylene glycol, has been characterized by FT-IR, 1 HNMR and LCMS. The binuclear Copper(II) complex has been characterized by UV/visible spectra, FTIR spectra, EPR spectra, ESI-MS spectra, magnetic moment measurement and thermogravimetric analysis. DFT calculation has shown a Z type structure for the complex. Excellent superoxide dismutase activity with IC 50 value 8.6×10 −6 M for the complex has been observed.

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“…CHI 600B Electrochemical Analyzer (USA) with a three electrode cell assembly was used for electrochemical studies. e electrodes were cleaned as per reported procedure [31]. e SOD activity of the copper complex has been studied by the method of NBT reduction using KO 2 − • as the source of superoxide radical [32].…”

Section: Methodsmentioning

confidence: 99%

“…e X-band EPR spectra of the complex was recorded as the polycrystalline samples at room temperature (Figure 3). e iso value and geometric parameter G, that is, the measurement of exchange interaction between the copper centers were evaluated by using the following expression [31]:…”

Section: Epr Studies Of Thementioning

confidence: 99%

Synthesis, Spectroscopy, Thermal Analysis, Electrochemistry and Superoxide Scavenging Activity of a New Bimetallic Copper(II) Complex

Sarma

Das

2012

Journal of Chemistry

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A new bimetallic copper(II) complex has been synthesized with ligand obtained by the condensation of salicylaldehyde and the amine derived from reduction of nitration product of benzil. The ligand was characterized by1H NMR and mass spectra, and the binuclear Copper(II) complex was characterized by vibrational and electronic spectra, EPR spectra, and magnetic moment measurement. Thermogravimetric analysis study and electrochemical study of the complex were also done. The complex was found to show superoxide dismutase activity.

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Direct electrochemistry of dinuclear CuA fragment from cytochrome c oxidase of Thermus thermophilus at surfactant modified glassy carbon electrode

Cited by 26 publications

References 42 publications

Significant effect of charge microenvironment on the redox potential of [Fe₄Se₄(SPh)₄]²⁻ in solution and inside film

Significant effect of charge microenvironment on the redox potential of [Fe₄Se₄(SPh)₄]²⁻ in solution and inside film

Synthesis, characterization and superoxide dismutase activity of bi-copper(II)-bisacetato- μ−phthalicacid[bis(benzyloxy)ethyl]ester

Synthesis, Spectroscopy, Thermal Analysis, Electrochemistry and Superoxide Scavenging Activity of a New Bimetallic Copper(II) Complex

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Direct electrochemistry of dinuclear CuA fragment from cytochrome c oxidase of Thermus thermophilus at surfactant modified glassy carbon electrode

Cited by 26 publications

References 42 publications

Significant effect of charge microenvironment on the redox potential of [Fe4Se4(SPh)4]2− in solution and inside film

Significant effect of charge microenvironment on the redox potential of [Fe4Se4(SPh)4]2− in solution and inside film

Synthesis, characterization and superoxide dismutase activity of bi-copper(II)-bisacetato- μ−phthalicacid[bis(benzyloxy)ethyl]ester

Synthesis, Spectroscopy, Thermal Analysis, Electrochemistry and Superoxide Scavenging Activity of a New Bimetallic Copper(II) Complex

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Significant effect of charge microenvironment on the redox potential of [Fe₄Se₄(SPh)₄]²⁻ in solution and inside film

Significant effect of charge microenvironment on the redox potential of [Fe₄Se₄(SPh)₄]²⁻ in solution and inside film