Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/41708
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dc.contributor.authorCosta, Ana L.-
dc.contributor.authorGomes, Ana C.-
dc.contributor.authorPillinger, Martyn-
dc.contributor.authorGonçalves, Isabel S.-
dc.contributor.authorPina, João-
dc.contributor.authorSeixas de Melo, J. Sérgio-
dc.date.accessioned2017-06-02T09:47:18Z-
dc.date.issued2017-
dc.identifier10.1002/cphc.201601236-
dc.identifier.urihttp://hdl.handle.net/10316/41708-
dc.description.abstractSteady-state and time-resolved absorption and fluorescence measurements are reported for Congo Red (CR) in aqueous and dimethylsulfoxide (DMSO) solutions. The very low fluorescence quantum yield (≈10(-4) ) for CR in dilute solutions together with the absence of a triplet state indicates that internal conversion is the dominant deactivation route with more than 99.99 % of the quanta loss (attributed to the energy gap law for radiationless transitions). Although no direct evidence for trans-cis photoisomerization was obtained from absorption or fluorescence data, the global analysis of fs-transient absorption data indicates the presence of a photoproduct with a lifetime of ≈170 ps that is suggested to be associated with such a process. Spectral data for more concentrated CR solutions indicate the presence of oblique or twisted J-type aggregates. These results are compared with spectra for CR in the solid state (sodium salt) and intercalated in a layered double hydroxide via a one-step co-precipitation route. Powder XRD and electronic spectral data for the nanohybrid indicate that the CR guest molecules are intercalated as a monolayer consisting of slipped cofacial J-type aggregates.por
dc.language.isoengpor
dc.relationFundação para a Ciência e a Tecnologia. Grant Numbers: PEst-OE/QUI/UI0313/2014por
dc.relationFundação para a Ciência e a Tecnologia. Grant Numbers: FCOMP-01-0124-FEDER-029779por
dc.relationFundação para a Ciência e a Tecnologia. Grant Numbers: PTDC/QEQ-SUP/1906/2012por
dc.relationFundação para a Ciência e a Tecnologia. Grant Numbers: POCI-01-0145-FEDER-007679por
dc.relationFundação para a Ciência e a Tecnologia. Grant Numbers: UID/CTM/50011/2013por
dc.relationFundação para a Ciência e a Tecnologia. Grant Numbers: SFRH/BD/88806/2012por
dc.relationFundação para a Ciência e a Tecnologia. Grant Numbers: SFRH/BPD/108541/2015por
dc.relationFundação para a Ciência e a Tecnologia. Grant Numbers: SFRH/BPD/108469/2015por
dc.rightsembargoedAccess-
dc.titleInsights into the Photophysics and Supramolecular Organization of Congo Red in Solution and the Solid Statepor
dc.typearticle-
degois.publication.firstPage564por
degois.publication.lastPage575por
degois.publication.issue5por
degois.publication.titleChemPhysChempor
dc.relation.publisherversionhttp://onlinelibrary.wiley.com/doi/10.1002/cphc.201601236/fullpor
dc.peerreviewedyespor
degois.publication.volume18por
dc.date.embargo2018-06-02T09:47:18Z-
item.languageiso639-1en-
item.grantfulltextopen-
item.fulltextCom Texto completo-
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais
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