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Received July 1, 2015
Accepted November 26, 2015
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Photoisomerization behavior of photochromic amide-based azobenzene dyes exhibiting H-bonding effect: Synthesis and characterization

BMS R and D Centre, BMS College of Engineering, Basavanagudi, Bangalore 560019, India 1Faculty of Industrial Sciences and Technology, University Malaysia Pahang, 26300, Gambang, Kuantan, Malaysia 2Department of Pharmaceutical, Technology, Kulliyyah of Pharmacy, International Islamic University, Malaysia (IIUM), Pahang Darul Makmur, Malaysia 3Department of Chemistry, Indian Institute of Technology, Guwahati, 781039, Guwahati - Assam, India
Korean Journal of Chemical Engineering, April 2016, 33(4), 1480-1488(9), 10.1007/s11814-015-0259-8
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Abstract

Amide linkage was introduced into azo compound at para position and its optical storage properties were investigated. Synthesized compounds showed liquid crystalline behavior when electron withdrawing group was inserted in the chemical structure. UV/Vis study showed that the photoisomerization effect in solution occurred at 18-24 sec (E-Z) and 5-11 hours (Z-E), whereas in solids it occurred at 30 sec (E-Z) and 5 hours (Z-E). Photoisomerization effect of amide based azodyes in the presence of hydrogen bonding is discussed for the first time. Effect of terminal electronic withdrawing groups on hydrogen bonding is speculated to be the reason behind the surprising behavior. Strong evidence for the structure property relations reported here is useful for applications such as optical storage device in which one can tune the structure according to one’s requirement.

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