Primary steps of oxidation and electronic interactions in anodic cleavage of α,ω-diisocyanurate substituted dialkyl disulfides

Grogger, Christa; Фаттахов, С. Г.; Jouikov, Viatcheslav; Shulaeva, M. M.; Резник, В. С.

doi:10.1016/j.electacta.2004.02.032

Cited by 18 publications

(7 citation statements)

References 46 publications

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“…The reversible wave is accompanied by two irreversible diffusion-controlled peaks: one localized at a high cathodic potential ( E p,c = −2.0 V) and the other at a high anodic value ( E p,a = +1.16 V). These two irreversible waves are characteristic of the reductive and oxidative cleavage of the disulfide bond, respectively. , It is noteworthy that their intensities are 1.2–1.3-fold higher than the anodic or cathodic peak current of the reversible wave of ferrocenoyl, suggesting that more than one electron is involved in both the reductive and oxidative process. , …”

Section: Resultsmentioning

confidence: 98%

“…These two irreversible waves are characteristic of the reductive and oxidative cleavage of the disulphide bond, respectively. 27,28 It is noteworthy that their intensities are 1.2-1.3-fold higher than the anodic or cathodic peak current of the reversible wave of ferrocenoyl, suggesting that more than one electron is involved in both the reductive and oxidative process. 27,28 In situ monitoring of the FcCO 2 DT self-assembly on gold was performed as follows.…”

Section: Resultsmentioning

confidence: 99%

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Switching On/Off the Chemisorption of Thioctic-Based Self-Assembled Monolayers on Gold by Applying a Moderate Cathodic/Anodic Potential

Sahli

Fave²,

Raouafi

et al. 2013

Langmuir

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An in situ and real-time electrochemical method has been devised for quantitatively monitoring the self-assembly of a ferrocene-labeled cyclic disulfide derivative (i.e., a thioctic acid derivative) on a polycrystalline gold electrode under electrode polarization. Taking advantage of the high sensitivity, specificity, accuracy, and temporal resolution of this method, we were able to demonstrate an unexpectedly facilitated formation of the redox-active SAM when the electrode was held at a moderate cathodic potential (-0.4 V vs SCE in CH3CN), affording a saturated monolayer from only micromolar solutions in less than 10 min, and a totally impeded SAM growth when the electrode was polarized at a slightly anodic potential (+0.5 V vs SCE in CH3CN). This method literally allows for switching on/off the formation of SAMs under "soft" conditions. Moreover the cyclic disulfide-based SAM was completely desorbed at this potential contrary to the facilitated deposition of a ferrocene-labeled alkanethiol. Such a strikingly contrasting behavior could be explained by an energetically favored release of the thioctic-based SAM through homolytic cleavage of the Au-S bond followed by intramolecular cyclization of the generated thiyl diradicals. Moreover, the absence of a discernible transient faradaic current response during the potential-assisted adsorption/desorption of the redox-labeled cyclic disulfide led us to conclude in a potential-dependent reversible surface reaction where no electron is released or consumed. These results provide new insights into the formation of disulfide-based SAMs on gold but also raise some fundamental questions about the intimate mechanism involved in the facilitated adsorption/desorption of SAMs under electrode polarization. Finally, the possibility to easily and selectively address the formation/removal of thioctic-based SAMs on gold by applying a moderate cathodic/anodic potential offers another degree of freedom in tailoring their properties and in controlling their self-assembly, nanostructuration, and/or release.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Switching On/Off the Chemisorption of Thioctic-Based Self-Assembled Monolayers on Gold by Applying a Moderate Cathodic/Anodic Potential

Sahli

Fave²,

Raouafi

et al. 2013

Langmuir

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“…Decreasing the particle size will increase the catalytic activity, but there is a critical size below which proves that further decreases will actually hamper the reaction [31]. Metal nanoparticles support the electron (e -) relay from the donor to the acceptor and act as a substrate for the e -transfer reaction.…”

Section: Methylene Orange (Mo)mentioning

confidence: 99%

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

S¹,

M²,

MV³

2015

J Bioremed Biodeg

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The scientific community is search in for new methods for the synthesis of metallic nanoparticles. Green synthesis has now become a vast developing area of new research groups. Here we report a green method to the synthesis of silver nanoparticles (AgNPs) using the different parts of Vishanika or Indian screw tree, an ayurvedic medicinal tree. This is nontoxic, eco-friendly and low cost method. The reduction and stabilization capability of the plant extracts of different parts are described. The size and structure of the silver can be characterized by varying the plant parts of the vishanika. The biosynthesized nanoparticles are characterized by using UV-VIS spectroscopy, TEM, XRD, DLS and FTIR. The size and extract dependent catalytic activity of the biosynthesized nanoparticles is established in the degradation of organic dyes.plant products represent excellent platforms for this purpose [6][7][8]13]. The compounds present in plants that have different potential biological activities; phytochemicals are important natural resource for the synthesis of metal nanoparticles. They play important roles in both stabilization and reduction of nanoparticles. The focus of the present work is to apply the accurate principles of green chemistry for the synthesis of silver nanoparticles by using stem bark, root and leaf of Helicteres isora extracts as stand-alone reducing and capping agent. H. isora plant extracts possess anticancer properties [14]. Usually, the bark and root juice were used against diabetes and emphysema. In traditional medicine, the bark and root juice is claimed to be useful in snake bite, diabetes, blood disorder, cough, colic, diarrhoea, astringent, etc., [15], expectorant and astringent [16], hypolipidemic [17], antihyperglycemic activity and glibenclamide [18]. In the present study, we have investigated the extracts and size dependent catalytic degradation of organic dyes-methyl violet, safranin, eosin methylene blue and methyl orange by in the presence of silver colloids. Materials and MethodsSilver nitrate (99.99%), methyl violet, safranin, eosin methylene blue and methyl orange, were purchased from sigma Aldrich. All glassware's were cleaned with sterile distilled water and rinsed with deionized water. Preparation of extractDifferent parts of (stem bark, root and leaf) H. isora were collected from Western Ghats of Tamil Nadu, washed with sterile distilled water and dried, then make it powder. 1 g of each explants powder was mixed with 100 mL of water and kept on orbital shaker at 120 rpm for 12 h. After that, the extracts were filtered with filter paper and stored at 4 0 C in refrigerator until further use. Journal of Bior emediation & Biodegradation Synthesis of silver nanoparticlesSilver nanoparticles (stem bark (S), root (R) and leaf (L)) have been synthesized by Bhakya et al. [19] method with slight modification. The formation of AgNPs is indicated by the appearance of dark brown color within 5 min. CharacterizationUV-visible spectra analysis was performed for all samples and the abs...

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“…plays a role in water purification as it is capable of removing chemical as well as biological contaminants [34,35]. During degradation, the catalysis occurs on the surface region of nanoparticles, therefore increasing the surface area availability which will significantly improve the efficiency of the catalyst [36]. Metal nanoparticles support the electron (e -) relay from the donor to the acceptor and act as a substrate for the etransfer reaction.…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Preparation of Zinc Oxide Nanoparticles using Azima tetracantha Lam. Leaf Extract and Its Potential for the Removal of Contaminants from Water

.¹,

Shanmugam²

2020

JNST

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Biologically synthesized metal oxide nanoparticles are gaining considerable interest in the removal of contaminants from surface water. In the present work, zinc oxide nanoparticles (ZnO NPs) were prepared using the biocomponents of Azima tetracantha Lam. leaves and evaluated for their photocatalytic and antifungal activity. Physico-chemical characterization of developed nanoparticles was carried out by UV-Vis spec, FTIR, DLS and TEM. The nanoparticles were characterized by a peak at 360 nm in the UV-Vis spectrum. FTIR spectra confirmed the presence of functional groups of leaf extract and nanoparticles. The size of nanoparticles as analyzed by DLS was 167 nm with a zeta potential of-19 mv which highlighted the colloidal stability of nanoparticles. TEM analysis revealed the spherical shape of the nanoparticles with a size range of 18-25 nm. In view of photocatalytic activity, the results showed that nanoparticles potentially degraded the organic dyes (methylene blue, methyl violet, methyl red, safranin and eosin) depending upon the time exposure to solar irradiation. Further, ZnO NPs strongly inhibited the germination of Aspergillus niger and Candida albicans spores in vitro. Our results suggest that biogenic ZnO NPs could be exploited as nanostructured catalysts and opens up the possibility of ZnO NPs application in water treatment plants and textile industries as it is fast, clean and environment friendly.

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Primary steps of oxidation and electronic interactions in anodic cleavage of α,ω-diisocyanurate substituted dialkyl disulfides

Cited by 18 publications

References 46 publications

Switching On/Off the Chemisorption of Thioctic-Based Self-Assembled Monolayers on Gold by Applying a Moderate Cathodic/Anodic Potential

Switching On/Off the Chemisorption of Thioctic-Based Self-Assembled Monolayers on Gold by Applying a Moderate Cathodic/Anodic Potential

Catalytic Degradation of Organic Dyes using Synthesized Silver Nanoparticles: A Green Approach

Preparation of Zinc Oxide Nanoparticles using Azima tetracantha Lam. Leaf Extract and Its Potential for the Removal of Contaminants from Water

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