Synthesis and comparative studies of carbosilane liquid crystalline dendrimers with chiral terminal mesogenic groups

A new series of carbosilane liquid crystalline (LC) dendrimers from the first to the third generations with 8, 16 and 32 chiral terminal mesogenic groups, respectively, has been synthesized. The molecular structures and purity of all new compounds were confirmed by ^sup 1^H NMR spectroscopy and GPC...

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Bibliographic Details
Published in:Colloid and polymer science 2005-08, Vol.283 (11), p.1155-1162
Main Authors: BOIKO, N. I, LYSACHKOV, A. I, PONOMARENKO, S. A, SHIBAEV, V. P, RICHARDSON, R. M
Format: Article
Language:English
Subjects:
Dendrimers
Electrooptical
Ferroelectric materials
Liquid crystals
Microscopy
NMR spectroscopy
Switching
Terminals
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Summary:A new series of carbosilane liquid crystalline (LC) dendrimers from the first to the third generations with 8, 16 and 32 chiral terminal mesogenic groups, respectively, has been synthesized. The molecular structures and purity of all new compounds were confirmed by ^sup 1^H NMR spectroscopy and GPC analysis. Data of polarization microscopy and SAX analysis demonstrated that all LC dendrimers synthesized form a chiral smectic SmC* phase at temperatures below 50 °C. It has been found that bistable electrooptical switching is observed for all dendrimers. The influence of chiral mesogenic fragment length on phase behavior and ferroelectric properties of carbosilane LC dendrimers is discussed.[PUBLICATION ABSTRACT]
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-005-1313-6