Columnar propeller-like 1,3,5-triphenylbenzenes: the missing link of shape-persistent hekates
作者:Tobias Wöhrle、Stuart James Beardsworth、Christopher Schilling、Angelika Baro、Frank Giesselmann、Sabine Laschat
DOI:10.1039/c5sm02489g
日期:——
Triphenylbenzenes with different substitution patterns at the outer phenyl rings have been successfully synthesised. Sixfold n-alkoxy substitution was insufficient for mesomorphism, but already increasing the number of sidechains by three methoxy groups led to liquid crystalline behaviour and mesophase formation. Symmetrical triphenylbenzenes with nine n-alkoxy sidechains (≥C9) formed broad enantiotropic
Synthesis of Substituted Dibenz[<i>a</i>,<i>c</i>]anthracenes and an Investigation of Their Liquid-Crystalline Properties
作者:Katie M. Psutka、Joshua Williams、Joseph A. Paquette、Oliver Calderon、Kevin J. A. Bozek、Vance E. Williams、Kenneth E. Maly
DOI:10.1002/ejoc.201403504
日期:2015.3
We report the synthesis of a series of 2,3,5,6-tetraalkoxydibenz[a,c]anthracenes bearing substituents (H, OCH3, or CN) in the 11- and 12-positions and an investigation of their liquid-crystalline properties. The synthesis involved Suzuki coupling of the appropriate dibromonaphthalene and boronate ester, followed by an oxidative cyclization. Compounds 4 and 5, bearing OCH3 and H, respectively, do not
Stabilization of Columnar Liquid Crystal Phases via Arene-Perfluoroarene Interactions
作者:Rebecca E. Yardley、Joseph A. Paquette、Hi Taing、Heather M. Gaebler、S. Holger Eichhorn、Ian P. Hamilton、Kenneth E. Maly
DOI:10.1021/acs.orglett.9b04091
日期:2019.12.20
We report the synthesis of novel polycatenar dibenzopentacenequinones 1 and 2 that are designed to form columnar liquid crystalline phases. The mesomorphic properties of these compounds were investigated by polarized optical microscopy, differential scanning calorimetry, and powder X-ray diffraction. While compound 1 exhibits two distinct columnar mesophases between 148 and 177 °C, fluorinated 2 exhibits
Synthesis and Self-Assembly of Liquid Crystalline Triphenylenedicarboxythioimides
作者:Katie M. Psutka、Joshua LeDrew、Hi Taing、S. Holger Eichhorn、Kenneth E. Maly
DOI:10.1021/acs.joc.9b01330
日期:2019.9.6
We report the synthesis and properties of a series of novel triphenylenedicarboxyimides and thioimides (4–6) to probe the effect of thionation on the formation of columnar mesophases. These materials display broad columnar mesophases and high clearing points and self-associate in solution to form dimers. Overall, thionation improved the self-assembly in solution and led to a stabilization of the columnar
Synthesis and Mesomorphic Properties of Novel Dibenz[<i>a</i>,<i>c</i>]anthracenedicarboximides
作者:Katie M. Psutka、Kevin J. A. Bozek、Kenneth E. Maly
DOI:10.1021/ol502678m
日期:2014.10.17
The synthesis and characterization of a novel series of dibenz[a,c]anthracenedicarboximides is reported. Incorporating electron-withdrawing imides bearing flexible alkyl chains allowed for the production of materials that self-assemble into hexagonal columnar mesophases featuring broad temperature ranges. Furthermore, longer N-alkyl chains or branched N-alkyl chains broaden the mesophase temperature