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Synthesis and comparative studies of carbosilane liquid crystalline dendrimers with chiral terminal mesogenic groups |
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| Authors: | N?I?Boiko A?I?Lysachkov S?A?Ponomarenko |
| Institution: | (1) Chemistry Department, Moscow State University, Moscow, 119899, Leninskie Gory, Russia;(2) Institute of Synthetic Polymeric Materials, Russian Academy of Sciences, Ul. Profsoyuznaja, 70, Moscow, 117393, Russia;(3) H. H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK |
| Abstract: | 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 1H 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. |
| Keywords: | Liquid crystalline dendrimers Ferroelectric Mesophase Chiral mesogenic group |
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