- Synthesis and self-assembly of 5,5′-bis(phenylethynyl)-2,2′-bithiophene-based bolapolyphiles in triangular and square LC honeycombs
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A series of X-shaped 5,5′-bis(phenylethynyl)-2,2′-bithiophene-based bolaamphiphiles bearing two long lateral alkyl chains and two terminal glycerol groups has been synthesized by using Kumada and Sonogashira coupling reactions as key steps. The thermotropic liquid crystalline behavior of these compounds was investigated by POM, DSC and X-ray scattering. With elongation of the lateral alkyl chains two different kinds of liquid crystalline phases with honeycomb structures, ColhexΔ/p6mm, formed by (defective) triangular honeycomb cells, and Colsqu/p4mm with square cells were observed for these compounds. UV and PL measurements indicate fluorescent properties making them potential candidates for application in fluorescence sensor devices.
- Gao, Hongfei,Cheng, Huifang,Yang, Zonghan,Prehm, Marko,Cheng, Xiaohong,Tschierske, Carsten
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- New synthetic method for the polymerization of alkylthiophenes
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The polymerization of 2-iodo-3-alkylthiophenes using a Heck-type reaction with Pd(OAc)2/NBu4Br as catalytic system is reported leading to expected functionalized oligomers with good yields.
- Sevignon, Marc,Papillon, Julien,Schulz, Emmanuelle,Lemaire, Marc
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- Palladium-catalyzed coupling reactions towards the synthesis of well-defined thiophene-oligomers
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Heck- and Ullmann-type palladium-catalyzed reactions were used in order to perform the synthesis of 3′,4″-dioctyl-2,2′, 5′2″,5″,2′″-tetrathienyl. The desired oligothiophene was synthesized in five steps with a total yield of 38% by a Heck-type reaction of bromo-derivatives and a yield of 45% by an Ullmann-type reaction of iodo-precursors.
- Hassan, Jwanro,Gozzi, Christel,Schulz, Emmanuelle,Lemaire, Marc
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p. 280 - 283
(2007/10/03)
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