期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 1092, 期 -, 页码 176-186出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2015.03.026
关键词
Liquid crystals; Thermotropic mesomorphic; Cinnamoyl ester; Trans-cis isomerization; Photochromic compounds
资金
- University Grants Commission, New Delhi, Government of India [39-691/2010 (SR)]
A series of azobenzene-containing mesogens end-capped with cinnamoyl esters were synthesized and investigated its mesogenic and photochemical properties. Terminal substituents of the molecules were changed with various substituents like CN, Cl, H, CH3, and OCH3. Liquid crystalline properties of the synthesized compounds were studied and confirmed using differential scanning calorimetry, polarising optical microscopy. Compounds (4a-4e) exhibited a thermotropic mesomorph behaviour viz., nematic and smectic phases that depends on the terminal substituents. The thermal transition temperatures and the mesophase types are depend on the terminal substituents which are ascribed with the increasing cohesive forces between molecules as the conjugation length increases. These photochromic compounds exhibited strong UV-vis absorption maxima between 330 and 340 nm. Upon irradiation with selective UV light produces the trans-cis isomerization producing new maxima at 450 nm due to cis configuration. (C) 2015 Elsevier B.V. All rights reserved.
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