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27 August 2008 Polysilacage moiety as a bulky mesogenic motif
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Abstract
We found that 1-alkyl-4-phenyl-2,2,3,3,5,5,6,6,7,7,8,8-dodecamethyl-2,3,5,6,7,8-hexasilabicyclo[2.2.2]octanes exhibited hexagonal columnar phases with an alkyl group ranging from a methyl to a pentyl group. Introduction of a cyano group at para-position of the phenyl group was found to enhance the stability of the columnar phases. The observed columnar phases strikingly contrasted with a nematic phase of 1-alkyl-4-(4-cyanophenyl)bicyclo[2.2.2]octanes. Furthermore, the polysilacage derivatives with such short alkyl groups as n-propyl, n-butyl, n-pentyl, and n-hexyl at 1-position, that contain neither long alkyl groups nor aromatic rings, were also disclosed to exhibit columnar mesophases, indicating that the polysilacage moiety has a high tendency to form columnar structure.
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Masaki Shimizu, Masanori Nata, and Tamejiro Hiyama "Polysilacage moiety as a bulky mesogenic motif", Proc. SPIE 7050, Liquid Crystals XII, 70500K (27 August 2008); https://doi.org/10.1117/12.803771
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