Free radical induced one-electron oxidation of the phenothiazines chlorpromazine and promethazine

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Detlef Bahnemann
  • Klaus Dieter Asmus
  • Robin L. Willson

Externe Organisationen

  • Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
  • Brunel University
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Details

OriginalspracheEnglisch
Seiten (von - bis)1661-1668
Seitenumfang8
FachzeitschriftJournal of the Chemical Society, Perkin Transactions 2
Ausgabenummer9
PublikationsstatusVeröffentlicht - 1983
Extern publiziertJa

Abstract

Absolute rate constants have been measured for the reactions of the protonated forms of chlorpromazine and promethazine, CZH+ and PZH+, with the electrophilic radicals .OH, Br 2-., (SCN)2-., I2 -., N3., Tl2+, Tl(OH)+, (t-C4H9S t-C4H9)+., (CH3SSCH3)+., and lipoate+. in the pH range 2-8. Values for these one-electron oxidations vary from k = 3.1 × 108 mol-1 dm3 s-1 for [(t-C 4H9S t-C4H9)+. + PZH +] to 5.5 × 109 mol-1 dm3 s-1 for (Br2-. + CZH+). The yields of the oxidation products, PTZH2+., vary from 28% for (.OH + CZH+) to 97% for [(SCN)2.- + CZH +]. The PTZH2+. radical cations exhibit characteristic absorption spectra with two maxima around 270 and 510 nm, and extinction coefficients of Sε(CZH2+.) = 56 000 mol-1 dm 3 cm-1 at 270 nm and 12 000 mol-1 dm 3 cm-1 at 510 nm, and ε(PZH2+.) = 62 500 mol-1 dm3 cm-1 at 265 nm and 9 500 mol -1 dm3 cm-1 at 505 nm. A transient absorption around 350 nm observed in the reaction of the phenothiazines with hydroxyl radicals is most probably the .OH-adduct, PTZH(OH)+.. The mechanism of the .OH-radical-induced oxidation of phenothiazines suggested in an earlier publication has been confirmed and enlarged.

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Free radical induced one-electron oxidation of the phenothiazines chlorpromazine and promethazine. / Bahnemann, Detlef; Asmus, Klaus Dieter; Willson, Robin L.
in: Journal of the Chemical Society, Perkin Transactions 2, Nr. 9, 1983, S. 1661-1668.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Bahnemann, D, Asmus, KD & Willson, RL 1983, 'Free radical induced one-electron oxidation of the phenothiazines chlorpromazine and promethazine', Journal of the Chemical Society, Perkin Transactions 2, Nr. 9, S. 1661-1668. https://doi.org/10.1039/P29830001661
Bahnemann, D., Asmus, K. D., & Willson, R. L. (1983). Free radical induced one-electron oxidation of the phenothiazines chlorpromazine and promethazine. Journal of the Chemical Society, Perkin Transactions 2, (9), 1661-1668. https://doi.org/10.1039/P29830001661
Bahnemann D, Asmus KD, Willson RL. Free radical induced one-electron oxidation of the phenothiazines chlorpromazine and promethazine. Journal of the Chemical Society, Perkin Transactions 2. 1983;(9):1661-1668. doi: 10.1039/P29830001661
Bahnemann, Detlef ; Asmus, Klaus Dieter ; Willson, Robin L. / Free radical induced one-electron oxidation of the phenothiazines chlorpromazine and promethazine. in: Journal of the Chemical Society, Perkin Transactions 2. 1983 ; Nr. 9. S. 1661-1668.
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abstract = "Absolute rate constants have been measured for the reactions of the protonated forms of chlorpromazine and promethazine, CZH+ and PZH+, with the electrophilic radicals .OH, Br 2-., (SCN)2-., I2 -., N3., Tl2+, Tl(OH)+, (t-C4H9S t-C4H9)+., (CH3SSCH3)+., and lipoate+. in the pH range 2-8. Values for these one-electron oxidations vary from k = 3.1 × 108 mol-1 dm3 s-1 for [(t-C 4H9S t-C4H9)+. + PZH +] to 5.5 × 109 mol-1 dm3 s-1 for (Br2-. + CZH+). The yields of the oxidation products, PTZH2+., vary from 28% for (.OH + CZH+) to 97% for [(SCN)2.- + CZH +]. The PTZH2+. radical cations exhibit characteristic absorption spectra with two maxima around 270 and 510 nm, and extinction coefficients of Sε(CZH2+.) = 56 000 mol-1 dm 3 cm-1 at 270 nm and 12 000 mol-1 dm 3 cm-1 at 510 nm, and ε(PZH2+.) = 62 500 mol-1 dm3 cm-1 at 265 nm and 9 500 mol -1 dm3 cm-1 at 505 nm. A transient absorption around 350 nm observed in the reaction of the phenothiazines with hydroxyl radicals is most probably the .OH-adduct, PTZH(OH)+.. The mechanism of the .OH-radical-induced oxidation of phenothiazines suggested in an earlier publication has been confirmed and enlarged.",
author = "Detlef Bahnemann and Asmus, {Klaus Dieter} and Willson, {Robin L.}",
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Download

TY - JOUR

T1 - Free radical induced one-electron oxidation of the phenothiazines chlorpromazine and promethazine

AU - Bahnemann, Detlef

AU - Asmus, Klaus Dieter

AU - Willson, Robin L.

N1 - Copyright: Copyright 2015 Elsevier B.V., All rights reserved.

PY - 1983

Y1 - 1983

N2 - Absolute rate constants have been measured for the reactions of the protonated forms of chlorpromazine and promethazine, CZH+ and PZH+, with the electrophilic radicals .OH, Br 2-., (SCN)2-., I2 -., N3., Tl2+, Tl(OH)+, (t-C4H9S t-C4H9)+., (CH3SSCH3)+., and lipoate+. in the pH range 2-8. Values for these one-electron oxidations vary from k = 3.1 × 108 mol-1 dm3 s-1 for [(t-C 4H9S t-C4H9)+. + PZH +] to 5.5 × 109 mol-1 dm3 s-1 for (Br2-. + CZH+). The yields of the oxidation products, PTZH2+., vary from 28% for (.OH + CZH+) to 97% for [(SCN)2.- + CZH +]. The PTZH2+. radical cations exhibit characteristic absorption spectra with two maxima around 270 and 510 nm, and extinction coefficients of Sε(CZH2+.) = 56 000 mol-1 dm 3 cm-1 at 270 nm and 12 000 mol-1 dm 3 cm-1 at 510 nm, and ε(PZH2+.) = 62 500 mol-1 dm3 cm-1 at 265 nm and 9 500 mol -1 dm3 cm-1 at 505 nm. A transient absorption around 350 nm observed in the reaction of the phenothiazines with hydroxyl radicals is most probably the .OH-adduct, PTZH(OH)+.. The mechanism of the .OH-radical-induced oxidation of phenothiazines suggested in an earlier publication has been confirmed and enlarged.

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