Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/17726
DC FieldValueLanguage
dc.contributor.authorMelo, J. Seixas de-
dc.contributor.authorPina, G. Quinteiro, J.-
dc.contributor.authorBreda, S.-
dc.contributor.authorFausto, R.-
dc.date.accessioned2011-11-29T10:31:26Z-
dc.date.available2011-11-29T10:31:26Z-
dc.date.issued2001-05-
dc.identifier.urihttp://hdl.handle.net/10316/17726-
dc.description.abstractThe simple α- and γ-pyrones and the substituted 6-methyl, 4-hydroxy and 4-methoxy α-pyrones were investigated in relation to their spectroscopic properties. The characterization involves vibrational and electronic spectroscopy. IR spectra for the ground electronic state of the studied compounds at room temperature were obtained and interpreted taking into consideration the simulated ab initio (6-31G∗) data. The most important canonical structures accounting for the properties of the ground state were determined for each compound and several photophysical properties were evaluated: electronic spectra, oscillator strengths and the emission properties (both fluorescence and phosphorescence) in media of different polarity. The origin of the first singlet and triplet excited states is also discussed. In addition, the energies of the electronic transitions were estimated using semi-empirical molecular orbital calculations, the calculated results showing an excellent agreement with the experimental data.por
dc.language.isoengpor
dc.publisherElsevier Science B.V.por
dc.rightsopenAccesspor
dc.titleSpectroscopic characterization of α- and γ-pyrones and their substituted 4-hydroxy and 4-methoxy derivatives: an integrated infrared, photophysical and theoretical studypor
dc.typearticlepor
degois.publication.firstPage59por
degois.publication.lastPage67por
degois.publication.titleJournal of Molecular Structurepor
dc.peerreviewedYespor
degois.publication.volume565/566por
uc.controloAutoridadeSim-
item.grantfulltextopen-
item.languageiso639-1en-
item.fulltextCom Texto completo-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.researchunitCQC - Coimbra Chemistry Centre-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.parentresearchunitFaculty of Sciences and Technology-
crisitem.author.orcid0000-0001-9708-5079-
crisitem.author.orcid0000-0002-8264-6854-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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