Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/7416
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Campo DC | Valor | Idioma |
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dc.contributor.author | Fernandes, M. | - |
dc.contributor.author | Zea Bermudez, V. de | - |
dc.contributor.author | Ferreira, R. A. Sá | - |
dc.contributor.author | Carlos, Luís | - |
dc.contributor.author | Charas, A. | - |
dc.contributor.author | Morgado, J. | - |
dc.contributor.author | Silva, Maria Manuela | - |
dc.contributor.author | Smith, Michael John | - |
dc.date.accessioned | 2008-01-08T19:51:08Z | - |
dc.date.available | 2008-01-08T19:51:08Z | - |
dc.date.issued | 2007 | - |
dc.date.submitted | 2006 | - |
dc.identifier.citation | "Chemistry of Materials". ISSN 0897-4756. 19:16 (2007) 3892-3901. | eng |
dc.identifier.issn | 0897-4756 | eng |
dc.identifier.issn | 1520-5002 | eng |
dc.identifier.uri | https://hdl.handle.net/1822/7416 | - |
dc.description.abstract | In this paper, we propose for the first time that the combination of a sol-gel derived diurethane cross-linked siloxane-based biohybrid host including short poly(ε-caprolactone) segments (PCL(530)) and lanthanide aquocomplexes incorporating β-diketonate ligands yields an effective protecting cage that efficiently encapsulates the emitting centers and reduces luminescence quenching. The results obtained using the Eu(tta) 3 (H 2 O) 2 (where tta - is 2-thenoyltrifluoracetonate) complex demonstrate that 1 (2) carbonyl oxygen atoms of the host matrix enter the Eu 3+ coordination shell, thus replacing the labile water molecule-(s). The significant increase in the quantum efficiency q of the doped hybrid with respect to that of Eu(tta) 3 (H 2 O) 2 (44.2 versus 29.0%, respectively) reveals that complex anchoring to the PCL(530)-based host structure contributes to enhancement of the 5 D 0 quantum efficiency. However, when a complex that contains only strong chelating ligands, such as Eu(tta) 3 phen (where phen is 1,10-phenantroline), is incorporated into the same host medium, the effect is lost and the 5 D 0 nonradiative paths in the doped hybrid are higher than those existing in the complex itself. Under UVA exposure, the emission intensity of PCL(530)/siloxane/Eu(tta) 3 (H 2 O) 2 decreased 10% in 11 h, whereas that of PCL(530)/siloxane/Eu-(tta) 3 phen decreased 25% in the same period of time. | eng |
dc.description.sponsorship | Fundação para a Ciência e para a Tecnologia -POCI/CTM/46780/03; POCI/CTM/40063/01. | eng |
dc.description.sponsorship | CQ-VR. | eng |
dc.language.iso | eng | eng |
dc.publisher | ACS Publications | eng |
dc.rights | restrictedAccess | eng |
dc.subject | Biohybrid | eng |
dc.subject | Luminescent polymer | eng |
dc.subject | Eu3+ doped network | eng |
dc.title | Highly photostable luminescent poly(caprolactone)siloxane biohybrids doped with europium complexes | eng |
dc.type | article | por |
dc.peerreviewed | yes | eng |
dc.relation.publisherversion | http://pubs.acs.org/journals/cmatex/index.html | eng |
dc.relation.publisherversion | http://pubs.acs.org/cgi-bin/article.cgi/cmatex/2007/19/i16/pdf/cm062832n.pdf | - |
sdum.number | 16 | eng |
sdum.pagination | 3892-3901 | eng |
sdum.publicationstatus | published | eng |
sdum.volume | 19 | eng |
oaire.citationStartPage | 3892 | por |
oaire.citationEndPage | 3901 | por |
oaire.citationIssue | 16 | por |
oaire.citationVolume | 19 | por |
dc.identifier.doi | 10.1021/cm062832n | por |
dc.subject.wos | Science & Technology | por |
sdum.journal | Chemistry of Materials | por |
Aparece nas coleções: | CDQuim - Artigos (Papers) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Chem.Mater. 2007.pdf Acesso restrito! | main article with figures | 434,91 kB | Adobe PDF | Ver/Abrir |