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231224s2014 xx |||||o 00| ||eng c |
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7 |
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|a 10.1021/la501930e
|2 doi
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|a pubmed24n0799.xml
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|e rakwb
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|a eng
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| 100 |
1 |
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|a Ledin, Petr A
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Star-shaped molecules with polyhedral oligomeric silsesquioxane core and azobenzene dye arms
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|c 2014
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 20.05.2015
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|a Date Revised 29.07.2014
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a We synthesized a series of hybrid nanomaterials combining organic dyes with polyhedral oligomeric silsesquioxanes (POSS) based on three different azobenzenes: monoazobenzene (4-phenylazophenol), bis-azobenzene (Disperse Yellow 7 and Fast Garnet derivative), and push-pull azobenzene (Disperse Red 1) via hydrosilylation coupling. The azo-functionalized POSS compounds possess high thermal stability, and their branched architecture resulted in effective suppression of molecular aggregation and allowed for direct imaging of individual dye-POSS structures with expected molecular dimensions. Stable, uniform, smooth, and ultrathin nanocomposite films with mixed silica-organic composition and relatively low refractive indices can be fabricated from all azo-POSS branched conjugates. Finally, the photoisomerization behavior of POSS-conjugated 4-phenylazophenol was investigated in solution as well as in ultrathin nanocomposite film. We found that conjugation to POSS core did not affect the kinetics of trans-cis photoisomerization and thermal cis-trans relaxation. Furthermore, rapid and reversible photoisomerization was observed in azo-POSS nanocomposite films. We suggest that the highly stable branched azo-POSS conjugates with high dye grafting density described here can be considered for nanometer-sized photoswitches, active layer material with optical-limiting properties, and a medium with photoinduced anisotropy for optical storage
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|a Journal Article
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1 |
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|a Tkachenko, Ihor M
|e verfasserin
|4 aut
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1 |
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|a Xu, Weinan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Choi, Ikjun
|e verfasserin
|4 aut
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1 |
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|a Shevchenko, Valery V
|e verfasserin
|4 aut
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1 |
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|a Tsukruk, Vladimir V
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 30(2014), 29 vom: 29. Juli, Seite 8856-65
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
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|g volume:30
|g year:2014
|g number:29
|g day:29
|g month:07
|g pages:8856-65
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| 856 |
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|u http://dx.doi.org/10.1021/la501930e
|3 Volltext
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