Zhu Lu
2007
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Journal
Journal of Zhengzhou University
Abstract
A series of novel liquid crystalline 2,5-bis[4-(p-alkoxylphenyl)benzoyloxy] p-benzoquinone are synthesized via etherification,oxygenation and esterization reactions by using 1-bromon-alkane,4-hydroxy-4′-biphenylcarboxylic acid,and hydro-quinone as raw materials.The structures of compound 3 are identified by using elemental analysis,IR and 1H-NMR.The liquid crystalline behavior of compound 3 is characterized by differential scanning calorimetry(DSC) and polarizing optical microscopy(POM).It is found that compound 3 goes into liquid crystal phase when heated to their melting point(Tm).The typical smectic phase and nematic phase texture can be observed.Both Tm and isotropization temperature(Ti) of compound 3 change regularly with the carbon numbers of the end alkoxy groups.There is a gradual increase in smectic phase length and so do the smectic-nematic transition temperature.At the same time there is a gradual decrease in nematic phase length.