Liquid crystalline behavior and fluorescent property of calix[4]arene containing azobenzene photochromic group |
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Authors: | Linbo Gong Shuling Gong Haiqing Dong Chunlei Zhang Yuanyin Chen |
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Institution: | (1) College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China |
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Abstract: | The reaction of 4′-hydroxy-4-methyl azobenzene (1) and 1,6-dibromohexane afforded 6-bromo-1-((4-((4-met hylphenyl)azo)phenyl)oxy)hexane (2), which further reacted with p-tert-butylcalix4]arene to give the calix4]arene derivative (3) whose lower rim had been modified by the azobenzene photochromic group. The structure of 3 was characterized by 1H-nuclear magnetic resonance (NMR) and electrospray ionization-mass spectrometry (ESI-MS). The fluorescence intensity of compound
3 was two to four times higher than that of compounds 1 and 2 as the azobenzene group concentration in the range of 1.6 × 10−5 to 8.0 × 10−4 mol/L, indicating that the fluorescence quantum yield of the azobenzene group had been improved through being attached to
the calix4]arene skeleton. The liquid crystalline behavior of compound 3 was studied by polarized microscopy (POM) and differential scan calorimeter (DSC). Compound 3 exhibited the enchased texture of a smectic liquid crystal from 209.4°C to 219.5°C on heating, while 2 exhibited a liquid crystalline phase from 87.4 to 83.2°C on cooling. It was found that the calix4]arene skeleton was a good
platform for conformation immobilization of azobenzene photochromic group and the formation of liquid crystalline.
Translated from Chinese Journal of Applied Chemistry, 2006, 23(9): 1023–1026 译自: 应用化学] |
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Keywords: | azobenzene calixarene thermotropic liquid crystal fluorescence |
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