Synthesis and Characterization of Naphthalene-Based Banana- Shaped Liquid Crystals for Photoswitching Properties
A series of banana-shaped monomers containing naphthalene as central units, azobenzene in side arms with terminal alkenes were synthesized and characterized. Polarizing optical microscopy, DSC and X-ray diffraction measurements reveal that one compound processes a nematic phase while other four comp...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
John Wiley & Sons, Inc.
2014
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/5470/ http://umpir.ump.edu.my/id/eprint/5470/ http://umpir.ump.edu.my/id/eprint/5470/ http://umpir.ump.edu.my/id/eprint/5470/1/journal_of_chinese_chemical_society.pdf http://umpir.ump.edu.my/id/eprint/5470/4/Synthesis%20and%20Characterization%20of%20Naphthalene-Based%20Banana-Shaped%20Liquid%20Crystals%20for%20Photoswitching%20Properties.pdf |
| Summary: | A series of banana-shaped monomers containing naphthalene as central units, azobenzene in side arms with terminal alkenes were synthesized and characterized. Polarizing optical microscopy, DSC and X-ray diffraction measurements reveal that one compound processes a nematic phase while other four compounds exhibit B6 phase. The absorption spectrum of trans-azobenzene displays high-intensity -* transition at 365 and low-intensity n-* transition at 450 nm. These molecules exhibit strong photoisomerisation behaviour in solutions in which trans to cis isomerisation takes 55 seconds whereas reverse process takes about 32 hours. Such a long thermal back relaxation is useful for creation of optical image storage devices. |
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