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Issue 22, 2007
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Siloxane-terminated phenylpyrimidine liquid crystal hosts

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We report the synthesis and characterization of trisiloxane-terminated liquid crystals with 2-phenylpyrimidine cores that form partially bilayered SmA and SmC phases. Variable temperature measurements of smectic layer spacings by powder X-ray diffraction combined with measurements of optical tilt angles and observations of birefringence changes by polarized optical microscopy reveal that the trisiloxane end-group causes the SmA–SmC transition of these compounds to be more ‘de Vries-like’ when compared to a non-siloxane analogue. One such compound, 2-(4-(11-(1,1,1,3,3,5,5-heptamethyltrisiloxanyl)undecyloxy)phenyl)-5-(1-chlorooctyloxy)pyrimidine (3), is characterized by a maximum layer shrinkage of only 1.6% and may be considered a bona fide de Vries material.

Graphical abstract: Siloxane-terminated phenylpyrimidine liquid crystal hosts

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Publication details

The article was received on 22 Jan 2007, accepted on 05 Mar 2007 and first published on 21 Mar 2007

Article type: Paper
DOI: 10.1039/B700972K
J. Mater. Chem., 2007,17, 2313-2318

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    Siloxane-terminated phenylpyrimidine liquid crystal hosts

    L. Li, C. D. Jones, J. Magolan and R. P. Lemieux, J. Mater. Chem., 2007, 17, 2313
    DOI: 10.1039/B700972K

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