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Authordc.contributor.authorCastro Olivares, Rafael 
Authordc.contributor.authorGünther Sapunar, Germán es_CL
Authordc.contributor.authorZanocco Loyola, Antonio es_CL
Authordc.contributor.authorLemp Miranda, Else es_CL
Admission datedc.date.accessioned2013-12-26T20:02:13Z
Available datedc.date.available2013-12-26T20:02:13Z
Publication datedc.date.issued2009
Cita de ítemdc.identifier.citationJournal of Photochemistry and Photobiology A: Chemistry 207 (2009) 160–166en_US
Identifierdc.identifier.otherDOI: 10.1016/j.jphotochem.2009.05.012
Identifierdc.identifier.urihttps://repositorio.uchile.cl/handle/2250/121693
Abstractdc.description.abstractDetection of O2(1 g) emission, max = 1270 nm, following laser excitation and steady-state methodswere employed to measure the total reaction rate constant, kT, and the reactive reaction rate constant, kR, for the reaction between singlet oxygen and seven mono and disubstituted anthracenes. In most solvents, the rate constants for the quenching of singlet oxygen by monosubstituted anthracenes are in the order of 106M−1 s−1, whereas for the disubstituted compounds the values are in the order of 107M−1 s−1 indicating that both, mono and disubstituted anthracenes are good quenchers of singlet oxygen. The reactive rate constants were very close to the total rate constants, implying that quenching is essentially a chemical process. The analysis of solvent effect on kT and kR by using LSER equations indicates that singlet oxygen deactivation by the anthracene derivatives is accelerated by solvents with large values of both, dipolarity/polarizability and Hildebrand solvent parameters, being inhibited by hydrogen bond donor solvents in some cases. Solvent effect analysis support the formation of a loose, zwitterionic like exciplex for 9-methylanthracene and 9-methoxyanthracene, a loose exciplex with partial charge separation for di-substitutes anthracene and a compact exciplex with partial charge separation for anthracene and 9-phenylanthracene.en_US
Lenguagedc.language.isoen_USen_US
Type of licensedc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile*
Link to Licensedc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/*
Keywordsdc.subjectAnthracenesen_US
Títulodc.titleLinear free energy relationship analysis of solvent effect on singlet oxygen reactions with mono and disubstituted anthracene derivativesen_US
Document typedc.typeArtículo de revista


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Attribution-NonCommercial-NoDerivs 3.0 Chile
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Chile