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Thermal and photo optical properties of azoxybenzene/alkyloxy-azobenzene–cholesterol dimesogens with alkyl diacetylene linker

Published online by Cambridge University Press:  01 December 2005

Subramanian Kumaresan ,
V. Ajay Mallia ,
Yoshishige Kida  and
Nobuyuki Tamaoki
Subramanian Kumaresan
Affiliation:
Molecular Smart System Group, Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
V. Ajay Mallia
Affiliation:
Molecular Smart System Group, Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
Yoshishige Kida
Affiliation:
Okamura Oil Mill, Ltd., Kashiwara-Shi, Osaka 582-0004, Japan
Nobuyuki Tamaoki*
Affiliation:
Molecular Smart System Group, Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
*
a)Address all correspondence to this author.e-mail: n.tamaoki@aist.go.jp
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Abstract

Thermal and photo-optical properties of azoxybenzene/alkyloxy-azobenzene containing chiral dimesogens are presented. Alkyloxyazobenzene containing dimesogenic materials exhibited two kinds of smectic A phases. Photoirradiation at temperatures exhibiting smectic phases of pure materials in azobenzene linked dimesogens resulted in formation of the isotropic phase, and this was systematically studied at different liquid crystalline temperatures. The efficacy of these compounds as a dopant in the glassy liquid crystalline material was also explored. Increasing concentration to 4 wt%/5 wt% in azobenzene/azoxy-benzene derivatives caused a dramatic red-shift in the wavelength of reflected light by the host cholesteric glassy liquid crystal. Photo-isomerization of these dopants led to a blue-shift of the reflected light, and this effect could be used to tune the light reflectivity of these mixtures over the visible region.

Keywords

Phase transformationPhotochemicalOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 12 , December 2005 , pp. 3431 - 3438
Copyright
Copyright © Materials Research Society 2005

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