Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/41708
DC Field | Value | Language |
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dc.contributor.author | Costa, Ana L. | - |
dc.contributor.author | Gomes, Ana C. | - |
dc.contributor.author | Pillinger, Martyn | - |
dc.contributor.author | Gonçalves, Isabel S. | - |
dc.contributor.author | Pina, João | - |
dc.contributor.author | Seixas de Melo, J. Sérgio | - |
dc.date.accessioned | 2017-06-02T09:47:18Z | - |
dc.date.issued | 2017 | - |
dc.identifier.uri | https://hdl.handle.net/10316/41708 | - |
dc.description.abstract | Steady-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.iso | eng | por |
dc.relation | Fundação para a Ciência e a Tecnologia. Grant Numbers: PEst-OE/QUI/UI0313/2014 | por |
dc.relation | Fundação para a Ciência e a Tecnologia. Grant Numbers: FCOMP-01-0124-FEDER-029779 | por |
dc.relation | Fundação para a Ciência e a Tecnologia. Grant Numbers: PTDC/QEQ-SUP/1906/2012 | por |
dc.relation | Fundação para a Ciência e a Tecnologia. Grant Numbers: POCI-01-0145-FEDER-007679 | por |
dc.relation | Fundação para a Ciência e a Tecnologia. Grant Numbers: UID/CTM/50011/2013 | por |
dc.relation | Fundação para a Ciência e a Tecnologia. Grant Numbers: SFRH/BD/88806/2012 | por |
dc.relation | Fundação para a Ciência e a Tecnologia. Grant Numbers: SFRH/BPD/108541/2015 | por |
dc.relation | Fundação para a Ciência e a Tecnologia. Grant Numbers: SFRH/BPD/108469/2015 | por |
dc.rights | embargoedAccess | - |
dc.title | Insights into the Photophysics and Supramolecular Organization of Congo Red in Solution and the Solid State | por |
dc.type | article | - |
degois.publication.firstPage | 564 | por |
degois.publication.lastPage | 575 | por |
degois.publication.issue | 5 | por |
degois.publication.title | ChemPhysChem | por |
dc.relation.publisherversion | http://onlinelibrary.wiley.com/doi/10.1002/cphc.201601236/full | por |
dc.peerreviewed | yes | por |
dc.identifier.doi | 10.1002/cphc.201601236 | - |
degois.publication.volume | 18 | por |
dc.date.embargo | 2018-06-02T09:47:18Z | - |
uc.controloAutoridade | Sim | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | Com Texto completo | - |
item.languageiso639-1 | en | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.researchunit | CQC - Coimbra Chemistry Centre | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.parentresearchunit | Faculty of Sciences and Technology | - |
crisitem.author.orcid | 0000-0003-1848-1167 | - |
crisitem.author.orcid | 0000-0001-9708-5079 | - |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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File | Description | Size | Format | |
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ChemPhysChem_v1_rev_JSSM_post_print.pdf | 8.6 MB | Adobe PDF | View/Open |
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