First observation of very long-lasting emissive polarization in EPR spectra of Fremy's salt when reduced by ascorbic acid. An unusual aspect of the radical pair mechanism

Gualtieri, G. J.; Colacicchi, S.; Corvaja, Carlo

doi:10.1039/b204971f

Cited by 4 publications

(18 citation statements)

References 28 publications

(28 reference statements)

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“…(1) [11]. As a consequence, the reducing agent appear to be very effective, although the stoichiometric ratio of the reagents is unfavourable: 1.2 mM ascorbic acid towards 17 mM Fremy's salt [12].…”

Section: Radical Pair Reactionmentioning

confidence: 95%

“…Another advantage of this approach is the possibility to detect and to follow both the radicals and/or intermediates involved in the reaction, as in our case the ascorbyl radical (A À S ) [11]. Furthermore, the EPR technique might offer the possibility to utilize the main magnetic field to induce and to detect, at same time, the effects on radical pair reactions.…”

Section: Effects Of Magnetic Fields On the Nitroxide Epr Signal Decrementioning

confidence: 98%

“…The formation and decay of ascorbate radical anion intermediate can be outlined by the following equations [11].…”

Section: Radical Pair Reactionmentioning

confidence: 99%

“…This pair of reagents was selected because of the high biological significance of ascorbic acid, one of the more effective blood antioxidants which plays a primary role in biological systems as well as in biochemical processes. In our previous works on this reagent pair, it was observed a long-lasting chemically induced dynamic electron polarization (CIDEP) phenomenon [11]. For this reason, we used the system Fremy's salt-ascorbic acid, which possess the right conditions to verify the radical pair mechanism (RPM), in order to study the phenomenon directly by EPR.…”

Section: Introductionmentioning

confidence: 99%

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Improvements in technical assessment and protocol for EPR evaluation of magnetic fields effects on a radical pair reaction

Gualtieri

Colacicchi

Carnicelli

et al. 2005

Biophysical Chemistry

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Section: Radical Pair Reactionmentioning

confidence: 95%

Section: Effects Of Magnetic Fields On the Nitroxide Epr Signal Decrementioning

confidence: 98%

“…The formation and decay of ascorbate radical anion intermediate can be outlined by the following equations [11].…”

Section: Radical Pair Reactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Improvements in technical assessment and protocol for EPR evaluation of magnetic fields effects on a radical pair reaction

Gualtieri

Colacicchi

Carnicelli

et al. 2005

Biophysical Chemistry

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“…As mentioned earlier, FS strongly partitions in the aqueous phase. If a minor fraction of FS would enter the rubber‐based particles, FS might abstract hydrogen atoms from the EP(D)M backbone, in analogy with the work of Gualtieri and coworkers47 in the case of ascorbic acid, dissolved in water. As a result, this mechanism might provide an alternative explanation for the enhancement of crosslinking during electron‐beam irradiation in the presence of FS.…”

Section: Resultsmentioning

confidence: 95%

About crosslinking of low molecular weight ethylene‐propylene(‐diene) copolymer‐based artificial latices

Tillier

Meuldijk

Magusin

et al. 2005

J. Polym. Sci. A Polym. Chem.

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Crosslinking of artificial latices based on ethylene-propylene copolymers (EPM) and/or ethylene-propylene-diene copolymers (EPDM) has not thoroughly been studied yet. Moreover, crosslinking of EPM and/or EPDM particles is a prerequisite for the formation of a shell using seeded emulsion polymerization of, for example, methyl methacrylate (MMA), as described elsewhere. Therefore, the aim of this article is to improve the general understanding of the chemistry involved in the crosslinking process. This work especially emphasizes the influence of the initiation method, that is, a peroxide or a pulsed electron-beam, on crosslinking efficiency. All crosslinking efficiencies were obtained after extraction of the soluble polymer by tetrahydrofuran. The incorporation of the coagent, that is, divinylbenzene, into the EPM/EPDM phase was studied on a microscopic level by solid-state 13 C and 1 H nuclear magnetic resonance (NMR). Crosslinking of a low molecular weight EPM/ EPDM latex requires the presence of a coagent, for example, divinylbenzene, 1,6-hexanediol diacrylate, or poly(1,2-butadiene). The efficiency of crosslinking initiated by a pulsed electron-beam was improved to a great extent by the presence, in the aqueous phase, of potassium nitrosodisulfonate, also referred to as Fremy salt. Matrix Assisted Laser Desorption/Ionization-Time of Flight-Mass Spectrometry (MALDI-TOF-MS) was used to determine the influence of electron-beam irradiation on the chemical stability of surfactants. It was demonstrated that sodium dodecyl benzene sulfonate (SDBS) is not degraded by the irradiation, and is therefore the surfactant of choice for the stabilization of EPM/EPDM-based latices subjected to electron-beam irradiation. V V C 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 3600-3615, 2005

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In alkaline media, Fremy’s salt oxidizes alkanols by a hydrogen atom transfer mechanism

Kumar

Mondal

et al. 2010

Polyhedron

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First observation of very long-lasting emissive polarization in EPR spectra of Fremy's salt when reduced by ascorbic acid. An unusual aspect of the radical pair mechanism

Cited by 4 publications

References 28 publications

Improvements in technical assessment and protocol for EPR evaluation of magnetic fields effects on a radical pair reaction

Improvements in technical assessment and protocol for EPR evaluation of magnetic fields effects on a radical pair reaction

About crosslinking of low molecular weight ethylene‐propylene(‐diene) copolymer‐based artificial latices

In alkaline media, Fremy’s salt oxidizes alkanols by a hydrogen atom transfer mechanism

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