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Liquid Crystals Volume 33, 2006 - Issue 4
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Original Articles

Observation of intercalated smectic phases in symmetric liquid crystal dimers containing hydrazide groups

Haitao Wang Key laboratory of Automobile Materials, Ministry of Education, Institute of Materials Science and Engineering, Jilin University, Changchun 130012, PR China
,
Binglian Bai Key laboratory of Automobile Materials, Ministry of Education, Institute of Materials Science and Engineering, Jilin University, Changchun 130012, PR China
,
Peng Zhang Key laboratory of Automobile Materials, Ministry of Education, Institute of Materials Science and Engineering, Jilin University, Changchun 130012, PR China; Key Laboratory of Supramolecular Structure and Materials, Ministry of Education, Institute of Chemistry, Jilin University, Changchun 130012, PR China
,
Beihong Long Key laboratory of Automobile Materials, Ministry of Education, Institute of Materials Science and Engineering, Jilin University, Changchun 130012, PR China
,
Wenjing Tian Key Laboratory of Supramolecular Structure and Materials, Ministry of Education, Institute of Chemistry, Jilin University, Changchun 130012, PR China
&
Min Li Key laboratory of Automobile Materials, Ministry of Education, Institute of Materials Science and Engineering, Jilin University, Changchun 130012, PR ChinaCorrespondence[email protected]
Pages 445-450 | Received 22 Jul 2005, Accepted 20 Dec 2005, Published online: 20 Feb 2007
 
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Abstract

Dimeric hydrazide derivatives with nitro, phenyl, and methyl terminal subsistents were synthesized. The liquid crystalline properties were investigated by differential scanning calorimetry, polarizing optical microscopy and wide angle X‐ray diffraction. Interestingly, intercalated smectic phases were observed in these symmetric liquid crystal dimers. The effect of the substituents and the length of the spacer on the mesophase is discussed, confirming that intermolecular hydrogen bonding between the hydrazide groups was the driving force for the formation of the intercalated structures.

Acknowledgements

The authors are grateful to the National Science Foundation Committee of China (project No. 50373016), Program for New Century Excellent Talents in Universities of China Ministry of Education, Special Foundation for PhD Program in Universities of China, Ministry of Education (Project No. 20050183057), and Project 985‐Automotive Engineering of Jilin University for their financial support of this work.

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