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Issue 18, 2017
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Design of liquid crystals with ‘de Vries-like’ properties: structural variants of carbosilane-terminated 5-phenylpyrimidine mesogens

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Abstract

Structural variants of the ‘de Vries-like’ mesogen 5-[4-(12,12,14,14,16,16-hexamethyl-12,14,16-trisilaheptadecyloxy)phenyl]-2-hexyloxypyrimidine (QL16-6), including two isomers with branched iso-tricarbosilane end-groups, were synthesized and their mesomorphic and ‘de Vries-like’ properties were characterized by polarized optical microscopy, differential scanning calorimetry, small angle and 2D X-ray scattering techniques. A comparative analysis of isomers with linear and branched tricarbosilane end-groups shows that they exhibit comparable mesomorphic and ‘de Vries-like’ properties. Furthermore, the difference in effective molecular length Leff between the linear and branched isomers in the SmA and SmC phases (ca. 4–5 Å), which was derived from 2D X-ray scattering experiments, suggests that the linear tricarbosilane end-group is hemispherical in shape on the time-average, as predicted by a DFT conformational analysis at the B3LYP/6-31G* level.

Graphical abstract: Design of liquid crystals with ‘de Vries-like’ properties: structural variants of carbosilane-terminated 5-phenylpyrimidine mesogens

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Article information


Submitted
20 Feb 2017
Accepted
07 Apr 2017
First published
07 Apr 2017

Soft Matter, 2017,13, 3307-3313
Article type
Paper

Design of liquid crystals with ‘de Vries-like’ properties: structural variants of carbosilane-terminated 5-phenylpyrimidine mesogens

C. P. J. Schubert, C. Müller, A. Bogner, F. Giesselmann and R. P. Lemieux, Soft Matter, 2017, 13, 3307
DOI: 10.1039/C7SM00355B

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