Synthesis of Banana-Shaped Liquid Crystals for Photoswitching Properties
Three banana-shaped monomers containing naphthalene as central units and azobenzene in side arms with terminal alkenes were synthesized and characterized. DSC, polarizing optical microscopy, and X-ray diffraction measurements prove that all compounds exhibit B6 phase. The trans-azobenzene showed hig...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis
2013
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| Subjects: | |
| Online Access: | http://umpir.ump.edu.my/id/eprint/7480/ http://umpir.ump.edu.my/id/eprint/7480/ http://umpir.ump.edu.my/id/eprint/7480/ http://umpir.ump.edu.my/id/eprint/7480/1/Synthesis_of_Banana-Shaped_Liquid_Crystals_for_Photoswitching_Properties.pdf |
| Summary: | Three banana-shaped monomers containing naphthalene as central units and azobenzene in side arms with terminal alkenes were synthesized and characterized. DSC, polarizing optical microscopy, and X-ray diffraction measurements prove that all compounds exhibit B6 phase. The trans-azobenzene showed high-intensity π–π∗ transition at about 365 nm and low-intensity n–π∗ transition at about 450 nm. The strong hotoisomerizationbehavior in solutions of the molecules displayed that trans to cis isomerization takes 45 sec whereas reverse process takes about 28 h and 30 min. This long thermal back relaxation is useful for creation of optical image storage. |
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