Determination of chemical rate constants in singlet molecular oxygen reaction by using 1,4-dimethylnaphthalene endoperoxide
Author | dc.contributor.author | Günther, S. | |
Author | dc.contributor.author | Lemp Miranda, Else | |
Author | dc.contributor.author | Zanocco Loyola, Antonio | |
Admission date | dc.date.accessioned | 2018-12-20T15:20:34Z | |
Available date | dc.date.available | 2018-12-20T15:20:34Z | |
Publication date | dc.date.issued | 2002 | |
Cita de ítem | dc.identifier.citation | Journal of Photochemistry and Photobiology A: Chemistry, Volumen 151, Issue 1-3, 2002, Pages 1-5 | |
Identifier | dc.identifier.issn | 10106030 | |
Identifier | dc.identifier.other | 10.1016/S1010-6030(02)00175-2 | |
Identifier | dc.identifier.uri | https://repositorio.uchile.cl/handle/2250/158825 | |
Abstract | dc.description.abstract | Thermal decomposition of 1,4-dimethylnaphthalene endoperoxide (DMNE) as a source of singlet oxygen was used to measure chemical rate constants, k(R), for reactions between singlet oxygen, O-2((1)Delta(g)), and various substrates. Time resolved O-2((1)Delta(g)) IR luminescence detection and steady-state experiments were used to monitor the decomposition of the endoperoxide and the rate of singlet oxygen production. Only 25% of oxygen from thermal decomposition of DMNE, in acetonitrile at 20degreesC, is detected as O-2((1)Delta(g)). Values of k(R) for reactions of O-2((1)Delta(g)) with 1,4-diphenylisobenzofurane (DPBF) and rubrene measured by this method are similar to values obtained by photosensitization. Values of k(R) for the chemical reaction of O-2((1)Delta(g)) with the antiinflammatory drugs piroxicam and tenoxicam, of (6.1 +/- 0.4) x 10(6) and (1.6 +/- 0.2) 10(7) M-1 s(-1), respectively, are close to those for the total singlet oxygen deactivation rate. Thermal decomposition of aromatic endoperoxides is a convenient source of singlet oxygen for measurements of rate constants in reactions of O-2((1)Delta(g)) where photosensitization cannot be employed. However, experimental conditions and approaches involved determine the method's limitations and applicability in a given system. | |
Lenguage | dc.language.iso | en | |
Type of license | dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Chile | |
Link to License | dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ | |
Source | dc.source | Journal of Photochemistry and Photobiology A: Chemistry | |
Keywords | dc.subject | Actinometry | |
Keywords | dc.subject | Aromatic endoperoxides | |
Keywords | dc.subject | Chemical reation rate constant | |
Keywords | dc.subject | Oxicams | |
Keywords | dc.subject | Singlet oxygen | |
Título | dc.title | Determination of chemical rate constants in singlet molecular oxygen reaction by using 1,4-dimethylnaphthalene endoperoxide | |
Document type | dc.type | Artículo de revista | |
Cataloguer | uchile.catalogador | rvh | |
Indexation | uchile.index | Artículo de publicación SCOPUS | |
uchile.cosecha | uchile.cosecha | SI |
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