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Title: Synthesis and mesomorphic properties of nonsymmetric liquid crystalline dimers containing azobenzene groups
Authors: Rahman, Md Lutfor
Asik, Jahimin
Kumar, Sandeep
Silong, Sidik
Rahman, M.Z.A.
Keywords: mesophase
nonsymmetric dimers
cis-trans isomers
Issue Date: Mar-2009
Publisher: Taylor & Francis
Citation: Phase Transitions, 2009, Vol.82, p228
Abstract: Four novel nonsymmetric dimers containing azobenzene mesogenic groups were synthesized. The nonsymmetric dimers compounds namely, ethyl 4-[(4-lcub4-(4-((4-nitrophenyl)diazenyl)phenoxy)alkyloxyrcubphenyl)diazenyl]benzoate were obtained from the alkylation of ethyl 4-[(4-(4-bromoalkyloxy)phenyl)diazenyl]benzoate with 4-[(4-nitrophenyl)diazenyl]phenol. The mesomorphic properties of the compounds were determined by DSC and polarizing optical microscopy. The first member of the series was nonliquid crystalline while all other homologues display nematic and smectic A phases. The trans-azobenzene groups of the dimers display a high-intensity π-π* transition at about 365 nm and a low-intensity n-π* transition at around 465 nm, therefore, photochromism can be achieved by the introduction of the azo linkage to the dimeric liquid crystalline molecules.
Description: Restricted Access.
ISSN: E-ISSN: 1029-0338
P-ISSN: 0141-1594
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Copyright: 2009 Taylor & Francis
Appears in Collections:Research Papers (SCM)

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