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Title: Unusual odd-even effects depending on the monomer chain length in nematic liquid crystals made of rod-like dimers
Authors: Kundu, Brindaban
Pal, Santanu Kumar
Kumar, Sandeep
Pratibha, R.
Madhusudana, N.V.
Keywords: Condensed matter: structural, mechanical & thermal
Soft matter, liquids and polymers
Issue Date: 13-Feb-2009
Publisher: IOP Publishing Ltd.
Citation: Europhysics Letters, 2009, Vol. 85(3), p36002
Abstract: We report physical studies on the nematic phase exhibited by five members of a homologous series of symmetric dimers which have cyanobiphenyl end groups and, a disulphide bridging group in the spacer. All of them have rod-like conformations in the nematic phase, but unusually, the nematic-isotropic transition temperature, the birefringence and the dielectric anisotropy exhibit "odd-even" effects depending on the number of carbon atoms in the alkyl chain of a monomeric moiety. Further, the lowest "even" homologue exhibits a nematic-nematic transition. We argue that these phenomena arise from the relatively facile rotational fluctuations of the two monomeric moieties around the central S-S bond, whose orientation with respect to the long molecular axis changes between the "even" and "odd" members.
Description: Restricted Access.
ISSN: 0295-5075
1286-4854 (Online)
Alternative Location:
Copyright: 2009 IOP Publishing Ltd.
Appears in Collections:Research Papers (SCM)

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