Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/17837
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dc.contributor.authorBreda, S.-
dc.contributor.authorLapinski, L.-
dc.contributor.authorReva, I.-
dc.contributor.authorFausto, R.-
dc.date.accessioned2011-12-06T15:09:26Z-
dc.date.available2011-12-06T15:09:26Z-
dc.date.issued2004-02-20-
dc.identifier.urihttp://hdl.handle.net/10316/17837-
dc.description.abstractA combined matrix isolation and molecular orbital study of the vibrational spectra and photochemistry of 4,6-dimethyl-α-pyrone (DMAP) was undertaken. Two types of photoreactions: ring opening leading to conjugated ketene and valence isomerization to the Dewar form (1,5-dimethyl-2-oxa-3-oxobicyclo[2.2.0]hex-5-ene; DOOBH), occurred upon UV (λ>315 nm) irradiation. The latter reaction was efficient, whereas aldehyde–ketene was produced only in little amounts. In addition to the IR spectroscopic study of DMAP, the full mid-IR spectrum of the photoproduced DOOBH is reported and interpreted. Observation of 1,3-dimethyl-cyclobutadiene (DMCB), created by shorter wavelength UV irradiation (λ>235 nm) of DOOBH, is reported for the first time. In the matrices, DMCB forms a complex with CO2; the structure and IR absorption features of this cage confined DMCB–CO2 complex are also investigatedpor
dc.language.isoengpor
dc.publisherElsevier Sciencepor
dc.rightsopenAccesspor
dc.title4,6-Dimethyl-α-pyrone: a matrix isolation study of the photochemical generation of conjugated ketene, Dewar valence isomer and 1,3-dimethyl-cyclobutadienepor
dc.typearticlepor
degois.publication.firstPage139por
degois.publication.lastPage151por
degois.publication.titleJournal of Photochemistry and Photobiology A: Chemistrypor
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S1010603003003393-
dc.peerreviewedYespor
dc.identifier.doi10.1016/S1010-6030(03)00339-3-
degois.publication.volume162por
item.fulltextCom Texto completo-
item.grantfulltextopen-
item.languageiso639-1en-
crisitem.author.deptFaculdade de Ciências e Tecnologia, Universidade de Coimbra-
crisitem.author.parentdeptUniversidade de Coimbra-
crisitem.author.researchunitCoimbra Chemistry Center-
crisitem.author.orcid0000-0002-8264-6854-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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J. Photochemistry Photobiology A, 162 (2004) 139.pdf261.04 kBAdobe PDFView/Open
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