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231224s2016 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.5b04371
|2 doi
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|a eng
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| 100 |
1 |
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|a de Jeu, Wim H
|e verfasserin
|4 aut
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|a Substituted Septithiophenes with End Groups of Different Size
|b Packing and Frustration in Bulk and Thin Films
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|c 2016
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|a Text
|b txt
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|a Date Completed 14.06.2016
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|a Date Revised 16.02.2016
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a We report on three different liquid crystalline compounds with a central septithiophene core and alkylated end groups of strongly increasing bulkiness. In principle, the thiophene cores prefer to pack parallel to optimize their π-π interactions, which becomes sterically impossible for the bulkier end groups. Using X-ray diffraction, we find that the way out of this packing dilemma is toward liquid-crystal phases of higher dimensionality in the order smectic → columnar ↔ bicontinuous cubic. For the smectic phase, packing in a monolayer is no problem; for the other ones packing considerations become more stringent in films due to the boundaries. Surface X-ray techniques and atomic force microscopy indicate an appreciable difference between monolayer and three-layer films, in which the monolayers appear to escape from packing frustration by generating superstructures. We propose a basic structure of columns parallel to the substrate that provides a compromise between preserving some π-π interactions and packing the bulky alkyl groups
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Rahimi, Khosrow
|e verfasserin
|4 aut
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|a Ziener, Ulrich
|e verfasserin
|4 aut
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|a Vill, Roman
|e verfasserin
|4 aut
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|a Herzig, Eva M
|e verfasserin
|4 aut
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|a Müller-Buschbaum, Peter
|e verfasserin
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|a Möller, Martin
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|a Mourran, Ahmed
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|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 32(2016), 6 vom: 16. Feb., Seite 1533-41
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|g volume:32
|g year:2016
|g number:6
|g day:16
|g month:02
|g pages:1533-41
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|u http://dx.doi.org/10.1021/acs.langmuir.5b04371
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