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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1021/la302759k
|2 doi
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|a pubmed24n0732.xml
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|a (DE-627)NLM219597855
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|a (NLM)22816794
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Yamamoto, Koji
|e verfasserin
|4 aut
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| 245 |
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|a Two types of two-component gels formed from pseudoenantiomeric ethynylhelicene oligomers
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|c 2012
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 18.12.2012
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Two-component gels formed from pseudoenantiomeric ethynylhelicene oligomers in toluene exhibited two different properties depending on difference in numbers of helicenes in the two components. The combinations (M)-5/(P)-4, (M)-6/(P)-4, and (M)-7/(P)-4, which contained oligomers with comparable numbers of helicenes, formed transparent gels (Type I gels). The combinations (M)-6/(P)-3, (M)-7/(P)-3, and (M)-8/(P)-3, which contained oligomers with considerably different numbers of helicenes, formed turbid gels (Type II gels). Negative Cotton effects were observed for the Type I gels in the region between 350 and 450 nm, and were positive for the Type II gels, despite the use of (M)-oligomers for the longer components. UV/vis exhibited absorption maxima at 350 nm for the Type I gels and at 338 nm for the Type II gels. Different behaviors in gel formation processes were observed by fluorescence studies. Atomic force microscopy analysis showed fiber structures of 25-50 nm diameter for Type I gels and bundles of 100-150 nm diameter for Type II gels. The stoichiometry in gel formation also differed: The Type I gels showed 1:1 stoichiometry of the two components; the Type II gels showed no 1:1 stoichiometry, likely 1:2 stoichiometry. Using the Type I and II gels, two-layer gel systems were constructed
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Gels
|2 NLM
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|a Polycyclic Compounds
|2 NLM
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|a Polymers
|2 NLM
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|a ethynylhelicene
|2 NLM
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|a Toluene
|2 NLM
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| 650 |
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|a 3FPU23BG52
|2 NLM
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1 |
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|a Oyamada, Naohiro
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Mizutani, Marie
|e verfasserin
|4 aut
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| 700 |
1 |
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|a An, Zengjian
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Saito, Nozomi
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yamaguchi, Masahiko
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kasuya, Motohiro
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Kurihara, Kazue
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 28(2012), 32 vom: 14. Aug., Seite 11939-47
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:28
|g year:2012
|g number:32
|g day:14
|g month:08
|g pages:11939-47
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|u http://dx.doi.org/10.1021/la302759k
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