Synthesis and characterization of bent-shaped azobenzene monomers: Guest-host effects in liquid crystals with azo dyes for optical image storage devices

Rahman, Md Lutfor; Hegde, Gurumurthy; Kumar, Sandeep; Tschierske, Carsten; Chigrinov, V.G.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3904

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DC Field	Value	Language
dc.contributor.author	Rahman, Md Lutfor	-
dc.contributor.author	Hegde, Gurumurthy	-
dc.contributor.author	Kumar, Sandeep	-
dc.contributor.author	Tschierske, Carsten	-
dc.contributor.author	Chigrinov, V.G.	-
dc.date.accessioned	2010-07-20T09:32:08Z	-
dc.date.available	2010-07-20T09:32:08Z	-
dc.date.issued	2009-08-04	-
dc.identifier.citation	Optical Materials, 2009, Vol.32, p176	en
dc.identifier.issn	0925-3467	-
dc.identifier.uri	http://hdl.handle.net/2289/3904	-
dc.description	Restricted Access.	en
dc.description.abstract	Six novel bent-shaped monomers were synthesized such as substituted/or non-substituted 1,3-phenylene bis-{4-[(4-allyloxy)phenylazo]benzoate} (4a–c) and substituted/or non-substituted 1,3-phenylene bis-{4-[3-(4-allyloxy-3-fluoro)phenylazo]benzoate} (4d–f) in which azobenzene moiety in the periphery and substituted/or non-substituted resorcinol as central unit with polymeriable double bonds are linked at both ends of all the molecules. The mesophase behavior was investigated using polarizing optical microscopy, DSC and XRD measurements. Four members of the family show an intercalated smectic (Smintercal) phase and two were crystalline in nature. The trans-form of azo compounds (4a–f) showed a strong band in the UV region (355–366 nm), which was attributed to the π–π* transition, and a weak band in the visible region at 455–465 nm due to the n–π* transition. When one of the azo dye (4d) is mixed with liquid crystal as a guest, showed greater increase in thermal back relaxation time which is useful for creation of optical image storage devices.	en
dc.language.iso	en	en
dc.publisher	Elsevier Inc.	en
dc.relation.uri	http://dx.doi.org/10.1016/j.optmat.2009.07.006	en
dc.rights	2009 Elsevier B.V.	en
dc.subject	Liquid crystals	en
dc.subject	Bent-shaped monomer	en
dc.subject	Cis-trans isomerization	en
dc.subject	Optical materials	en
dc.subject	Guest–host effects	en
dc.subject	Optical image storage devices	en
dc.title	Synthesis and characterization of bent-shaped azobenzene monomers: Guest-host effects in liquid crystals with azo dyes for optical image storage devices	en
dc.type	Article	en
Appears in Collections:	Research Papers (SCM)

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