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Citation: LI Juan-Li, AN Zhong-Wei. Syntheses and Thermo Analyses of Lateral Single Fluorine Substituted 4,4'-Bis(trans-4-n-alkylcyclohexyl) biphenyl Liquid Crystals[J]. Chinese Journal of Applied Chemistry, ;2007, 24(2): 200-205. shu

Syntheses and Thermo Analyses of Lateral Single Fluorine Substituted 4,4'-Bis(trans-4-n-alkylcyclohexyl) biphenyl Liquid Crystals

LI Juan-Li ,
AN Zhong-Wei ^,

1.
Optical and Electrical Material Center, Xi'an Modern Chemistry Research Institute, Xi'an 710065

Corresponding author: AN Zhong-Wei,
Received Date: 16 March 2006
Available Online: 30 May 2006

Nine compounds of lateral single fluorine substituted 4,4'-bis(trans-4-n-alkylcyclohexyl) biphenyl liquid crystals were synthesized via Suzuki coupling reactions with 2-fluoro-4-(trans-4-alkylcyclohexyl) phenyl boric acid and(trans-4-n-alkylcyclohexyl)-bromo benzene as reactants.The purity of the products was more than 99.9%,and the yields were 28.0%~88.9%.Their structures were confirmed by means of~¹H NMR, IR and MS.The phase transition behavior was studied through differential scanning calorimetry(DSC) and polarizing optical microscopy(POM).The results show that all the compounds possess a wide temperature range of mesophases,the narrowest temperature range of mesophases is 138℃and the widest is 201℃.The smectic phase temperature range was dramatically reduced or disappeared,and the nematic phase temperature range was enlarged because of the introduction of lateral single fluorine.
- Suzuki coupling reaction,
- synthesis,
- liquid crystal,
- phase transition behavior
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