Details
| Original language | English |
|---|---|
| Pages (from-to) | 890-895 |
| Number of pages | 6 |
| Journal | Journal of the Chemical Society, Perkin Transactions 2 |
| Issue number | 6 |
| Publication status | Published - 1981 |
| Externally published | Yes |
Abstract
Absolute rate constants have been measured for the reaction of the anionic conjugate base of metiazinic acid, MZ-, in the pH range 8-11, with hydrated electrons (k 1.5 × 109 | mol-1 s-1), and for the oxidation of MZ- by OH., Br2-., (SCN)2-., CO3-., Tl(OH)2, N3,. .CH2CHO, (CH3SCH3)2+., CH3SSCH3+. and lipoate+.. The k values for these oxidations are found to be in the 109-1010 | mol-1 s-1 range, except for k(.CH2CHO + MZ-) 2 × 108 | mol-1 s-1. The oxidation of metiazinic acid leads to MZ±. radical zwitterions with yields ranging from 50 to 100% with the minimum value referring to the oxidation by .CH2CHO. The MZ±. radical zwitterion is characterized by two strong optical absorption bands with maxima at 530 (ε 11 000 | mol-1 cm-1) and 270 nm (51 500). Other primary oxidation products are indicated, but only a transient absorption around 350 nm (OH. adduct and/or hydrogen abstraction product) could qualitatively be identified in the reaction of metiazinic acid with hydroxyl radicals.
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In: Journal of the Chemical Society, Perkin Transactions 2, No. 6, 1981, p. 890-895.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Free radical reactions of the phenothiazine, metiazinic acid
AU - Bahnemann, Detlef
AU - Asmus, Klaus Dieter
AU - Willson, Robin L.
N1 - Copyright: Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1981
Y1 - 1981
N2 - Absolute rate constants have been measured for the reaction of the anionic conjugate base of metiazinic acid, MZ-, in the pH range 8-11, with hydrated electrons (k 1.5 × 109 | mol-1 s-1), and for the oxidation of MZ- by OH., Br2-., (SCN)2-., CO3-., Tl(OH)2, N3,. .CH2CHO, (CH3SCH3)2+., CH3SSCH3+. and lipoate+.. The k values for these oxidations are found to be in the 109-1010 | mol-1 s-1 range, except for k(.CH2CHO + MZ-) 2 × 108 | mol-1 s-1. The oxidation of metiazinic acid leads to MZ±. radical zwitterions with yields ranging from 50 to 100% with the minimum value referring to the oxidation by .CH2CHO. The MZ±. radical zwitterion is characterized by two strong optical absorption bands with maxima at 530 (ε 11 000 | mol-1 cm-1) and 270 nm (51 500). Other primary oxidation products are indicated, but only a transient absorption around 350 nm (OH. adduct and/or hydrogen abstraction product) could qualitatively be identified in the reaction of metiazinic acid with hydroxyl radicals.
AB - Absolute rate constants have been measured for the reaction of the anionic conjugate base of metiazinic acid, MZ-, in the pH range 8-11, with hydrated electrons (k 1.5 × 109 | mol-1 s-1), and for the oxidation of MZ- by OH., Br2-., (SCN)2-., CO3-., Tl(OH)2, N3,. .CH2CHO, (CH3SCH3)2+., CH3SSCH3+. and lipoate+.. The k values for these oxidations are found to be in the 109-1010 | mol-1 s-1 range, except for k(.CH2CHO + MZ-) 2 × 108 | mol-1 s-1. The oxidation of metiazinic acid leads to MZ±. radical zwitterions with yields ranging from 50 to 100% with the minimum value referring to the oxidation by .CH2CHO. The MZ±. radical zwitterion is characterized by two strong optical absorption bands with maxima at 530 (ε 11 000 | mol-1 cm-1) and 270 nm (51 500). Other primary oxidation products are indicated, but only a transient absorption around 350 nm (OH. adduct and/or hydrogen abstraction product) could qualitatively be identified in the reaction of metiazinic acid with hydroxyl radicals.
UR - http://www.scopus.com/inward/record.url?scp=37049108803&partnerID=8YFLogxK
U2 - 10.1039/P29810000890
DO - 10.1039/P29810000890
M3 - Article
AN - SCOPUS:37049108803
SP - 890
EP - 895
JO - Journal of the Chemical Society, Perkin Transactions 2
JF - Journal of the Chemical Society, Perkin Transactions 2
SN - 1472-779X
IS - 6
ER -