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Synthesis and Characterization of Naphthalene‐Based Banana‐Shaped Liquid Crystals for Photoswitching Properties
Author(s) -
Rahman Md Lutfor,
Yusoff Mashitah Mohd,
Hegde Gurumurthy,
Malek Muhammad Nor Fazli Abdul,
Samah Nurlin Abu,
Srinivasa H. T.,
Kumar Sandeep
Publication year - 2014
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201300191
Subject(s) - azobenzene , chemistry , monomer , liquid crystal , naphthalene , isomerization , diffraction , molecule , phase transition , photoisomerization , crystallography , phase (matter) , characterization (materials science) , relaxation (psychology) , absorption spectroscopy , photochemistry , absorption (acoustics) , photochromism , optics , optoelectronics , organic chemistry , polymer , materials science , psychology , social psychology , physics , quantum mechanics , catalysis
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 B 6 phase. The absorption spectrum of trans ‐azobenzene displays high‐intensity π‐π* transition at 365 and low‐intensity n‐π* 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.