- Controlling Mirror Symmetry Breaking and Network Formation in Liquid Crystalline Cubic, Isotropic Liquid and Crystalline Phases of Benzil-Based Polycatenars
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Spontaneous development of chirality in systems composed of achiral molecules is important for new routes to asymmetric synthesis, chiral superstructures and materials, as well as for the understanding of the mechanisms of emergence of prebiotic chirality. Herein, it is shown that the 4,4′-diphenylbenzil unit is a universal transiently chiral bent building block for the design of multi-chained (polycatenar) rod-like molecules capable of forming a wide variety of helically twisted network structures in the liquid, the liquid crystalline (LC) and the crystalline state. Single polar substituents at the apex of tricatenar molecules support the formation of the achiral (racemic) cubic double network phase with Ia (Formula presented.) d symmetry and relatively small twist along the networks. The combination of an alkyl chain with fluorine substitution leads to the homogeneously chiral triple network phase with I23 space group, and in addition, provides a mirror symmetry broken liquid. Replacing F by Cl or Br further increases the twist, leading to a short pitch double gyroid Ia (Formula presented.) d phase, which is achiral again. The effects of the structural variations on the network structures, either leading to achiral phases or chiral conglomerates are analyzed.
- Reppe, Tino,Poppe, Silvio,Tschierske, Carsten
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supporting information
p. 16066 - 16079
(2020/11/02)
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- Influence of fluoro substituents on the mesophase behaviour of banana-shaped molecules
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Three new series of bent-shaped five-ring liquid crystals, based on the ester of isophthalic acid as the central core and azomethine linkages, are presented. They differ by the number and the position of halogeno substituents on the outer rings. This lateral substitution strongly influences the type of mesophases formed. Calculations were performed to determine the modification of the distribution of charge along the different molecules.
- Bedel,Rouillon,Marcerou,Laguerre,Nguyen,Achard
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p. 2214 - 2220
(2007/10/03)
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- The Effect of 2- and 3-Lateral Substituents on the Acid Side of 4,4'-Disubstituted Phenylbenzoates and Phenylthiobenzoates on Mesomorphic Properties
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A variety of esters/thioesters of the type where A or B = F, Cl, Me; Z = O, S and Y = C10, OC10, COC9, CO2C9 and OCOC9 for Z = O and C5, C10, OC7, OC10 for Z = S and R = C8H17, C10H21, C12H25 were synthesized and their mesomorphic properties det
- Neubert, M. E.,Keast, S. S.,Dixon-Polverine, Y.,Herlinger F.,Jirousek M. R.,et al.
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p. 109 - 124
(2007/10/02)
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