Source:http://linkedlifedata.com/resource/pubmed/id/20714493
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
37
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| pubmed:dateCreated |
2010-9-10
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| pubmed:abstractText |
The excited state dynamics of periodic mesoporous organosilica (powder) bearing biphenylylene moieties densely in the silica framework (Bp-PMO) is investigated for the first time using femtosecond time-resolved diffuse reflectance (TDR) and picosecond time-resolved fluorescence spectroscopies. The TDR spectra revealed the excitation-relaxation process of the biphenylylene moieties, including the relaxation of the twisted Frank-Condon (FC) state to the lowest singlet excited state (S(1)) with a time constant of 730 ± 95 fs, and efficient quenching of the S(1) state by excimer (E) formations with two time constants of 7.0 ± 0.2 ps (E(1): ca. 64%) and 170 ± 47 ps (E(2) and E(3): ca. 36%). The individual absorption spectra of the FC, S(1), and E states were reconstructed by the TDR spectral analysis. The time-resolved fluorescence spectra showed that the excimers decayed with three time constants of 1.3 ± 0.2 ns (E(1)), 8.2 ± 0.7 ns (E(2)) and 27 ± 2 ns (E(3)). The fluorescence quantum yields of the excimers are suggested to be almost zero for E(1), and unity for E(2) and E(3), which implies that the fluorescence quantum yield of Bp-PMO (?(F) = 0.38) can be explained by the fraction of the highly emissive excimers (E(2) and E(3)). The excited state dynamics of Bp-PMO is quite different from those of a solution of 4,4'-bis-(triethoxysilyl)biphenyl precursor and a biphenyl molecular crystal (powder).
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:status |
PubMed-not-MEDLINE
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| pubmed:month |
Oct
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| pubmed:issn |
1463-9084
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| pubmed:author | |
| pubmed:issnType |
Electronic
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| pubmed:day |
7
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| pubmed:volume |
12
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| pubmed:owner |
NLM
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| pubmed:authorsComplete |
Y
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| pubmed:pagination |
11688-96
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| pubmed:year |
2010
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| pubmed:articleTitle |
Dynamics in the excited electronic state of periodic mesoporous biphenylylene-silica studied by time-resolved diffuse reflectance and fluorescence spectroscopy.
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| pubmed:affiliation |
Toyota Central R&D Labs., Inc., Nagakute, Aichi 480-1192, Japan.
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| pubmed:publicationType |
Journal Article
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