Résonance paramagnétique électronique des radicaux obtenus par oxydation ou réduction électrochimique de quelques dérivés de la phénothiazine en solution dans l’acétonitrile

Billon, J ean-Pierre; Cauquis, G.; Combrisson, J.

doi:10.1051/jcp/1964610374

Cited by 21 publications

(2 citation statements)

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“…1a, was observed. It is similar to the spectrum of PTH +• produced by photoionization of PTH during illumination at 347 nm in an ethanol solution (15). Therefore, the observed spectrum can be attributed to PTH +• and explained as…”

Section: Esr Measurementssupporting

confidence: 70%

Intermediates Produced in the Electron-Transfer Processes of Phenothiazine/Semiconductor Systems

Jian

Xiang

Sun

et al. 2000

Journal of Colloid and Interface Science

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Section: Esr Measurementssupporting

confidence: 70%

Intermediates Produced in the Electron-Transfer Processes of Phenothiazine/Semiconductor Systems

Jian

Xiang

Sun

et al. 2000

Journal of Colloid and Interface Science

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“…We have recently pointed out that in order to avoid the complications accompanying D/H exchange, proton transfer reactions must lie far to the right . The p K a of MPA +• in acetonitrile has been estimated to be equal to 3 from the value determined in dimethyl sulfoxide while that for 2,6-LUT in acetonitrile has been reported to be 15.4. The difference in p K a values corresponds to an equilibrium constant of about 10 12 for reaction 1 that for all practical purposes can be assumed to be irreversible.…”

Section: Resultsmentioning

confidence: 99%

Proton Transfer Reactions of Methylanthracene Radical Cations with Pyridine Bases under Non-Steady-State Conditions. Real Kinetic Isotope Effect Evidence for Extensive Tunneling

2001

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The kinetics of the proton transfer reactions between the 9-methyl-10-phenylanthracene radical cation (MPA(+)(.)) with 2,6-lutidine were studied in acetonitrile-Bu(4)NBF(4) (0.1 M) using derivative cyclic voltammetry. Comparisons of extent of reaction-time profiles with theoretical data for both the simple single-step proton transfer and a mechanism involving the formation of a donor-acceptor complex prior to unimolecular proton transfer were made. The experimental extent of reaction-time profiles deviated significantly from those simulated for the single-step mechanism, while excellent fits of experimental to theoretical data, in the pre-steady-state period, for the complex mechanism were observed. In this time period, the apparent deuterium kinetic isotope effects (KIE(app)) were observed to vary significantly with the extent of reaction as predicted by the complex mechanism. Resolution of the apparent rate constants into the microscopic rate constants for the complex mechanism resulted in a real kinetic isotope effect (KIE(real)) equal to 82 at 291 K. Arrhenius activation parameters (252-312 K) for the reactions of MPA(+)(*) with 2,6-lutidine in acetonitrile-Bu(4)NBF(4) (0.1 M) revealed E(a)(D) - E(a)(H) equal to 2.89 kcal/mol and A(D)/A(H) equal to 2.09. In this temperature range, KIE(real) varied from 46 at the highest temperature to 134 at the lowest. The large KIE(real), along with the Arrhenius parameters, are indicative of extensive tunneling for the proton transfer steps.

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Phenothiazine and Derivatives

Taurand¹

2000

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Uses and Biological Activity 2.1. Therapeutic Uses 2.2. Biological Activity 2.3. Other Uses 3. Syntheses and Reactions 3.1. Ring Syntheses 3.2. N‐Substituted Phenothiazines 3.3. C‐Substituted Phenothiazines 3.4. Analogues and Miscellaneous Compounds 3.5. Other Chemical Properties of the Phenothiazine Nucleus 4. Physical Properties 5. Toxicology

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Résonance paramagnétique électronique des radicaux obtenus par oxydation ou réduction électrochimique de quelques dérivés de la phénothiazine en solution dans l’acétonitrile

Cited by 21 publications

References 0 publications

Intermediates Produced in the Electron-Transfer Processes of Phenothiazine/Semiconductor Systems

Intermediates Produced in the Electron-Transfer Processes of Phenothiazine/Semiconductor Systems

Proton Transfer Reactions of Methylanthracene Radical Cations with Pyridine Bases under Non-Steady-State Conditions. Real Kinetic Isotope Effect Evidence for Extensive Tunneling

Phenothiazine and Derivatives

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