Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2022, Issue 37, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.202200990
Keywords
Alkynes; Cross-Coupling; Discotic nematic; Liquid Crystals; Triphenylenes
Categories
Funding
- Ministry of Education, Saudi Arabia
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Nematic mesophase formation in disc-like systems can be predicted and controlled by choosing the structure of the bridge. The degree of bending in the bridge determines the separation and conformational freedom of the discotic molecules, thus affecting the formation of nematic mesophases.
Nematic mesophase formation in disc-like systems remains relatively rare compared to higher-order columnar organisation, but it is observed in some rigid dimeric systems. Mesophase formation in rigid discotic dimers has been sequentially probed and is shown to be predictably controlled through structural choice of the bridge. Moderately bent bridges shorten the discogen separation and reduce conformational freedom. Severely bent dimers (1,2-phenylene bridge) show no mesophases but, as the angle is widened, columnar and nematic organisation becomes possible and progressively more favoured. The linear arrangement gives the most stable columnar mesophase and a narrow-range nematic mesophase.
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