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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4501

Title: H-shaped azoester-oxymethylene containing twin liquid crystalline compounds
Authors: Varia, M.C.
Kumar, Sandeep
Prajapati, A.K.
Keywords: azoester
DSC
ether linkage
H-shaped
symmetrical dimers
smectic C
Issue Date: Mar-2012
Publisher: Taylor & Francis
Citation: Liquid Crystals, 2012, Vol.39, p365-371
Abstract: Two mesogenic homologous series of H-shaped symmetrical dimers were synthesised and their thermotropic properties studied by differential scanning calorimetry and on a hot-stage of a polarising microscope. These compounds consisted of two mesogenic units of azoester interconnected through tetramethylene flexible spacers (n = 4) by ether linkage resulting in the structure of ‘H-shaped’ dimeric compounds. The difference between the two series was in the structure of terminal substituents (–CH3 for series I and –OCH3 for series II) attached on the azoestermesogens at one terminus. All these compounds were found to be smectogenic. The mesomorphic properties of the series were compared with each other and with other structurally related mesogenic H-shaped dimers. The trans-azobenzene groups of the H-shaped dimeric compounds displayed a high-intensity π–π ∗ transition at about 365 nm and a low intensity π–π ∗ transition at around 470 nm, therefore photochromism can be achieved by the introduction of the azo linkage to the H-shaped dimeric compounds.
Description: Restricted Access.
URI: http://hdl.handle.net/2289/4501
ISSN: 0267-8292
1366-5855 (online)
Alternative Location: http://dx.doi.org/10.1080/02678292.2012.657696
Copyright: 2012 Taylor & Francis
Appears in Collections:Research Papers (SCM)

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