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ABSTRACT
A novel azoester homologous series of liquid crystals (LCs) viz. RO‒C6H4COOC10H6-N˭N(ortho)-C6H4‒OC4H9(para) has been synthesized and studied with a view to understanding and establishing the effect of molecular structure on LC properties. Homologous Series consists of thirteen members (C1 to C18). C1 to C3 members are nonliquid Crystals and the rest of the homologues are LC in an enantiotropic manner. C7 to C18 are smectogenic in addition to nematogenic whereas C4, C5, and C6 are only nematogenic. The Sm-N and N‒I transition curves behave in a normal manner with the usual exhibition of an odd–even effect. The Cr-M/I curve also behaves in a normal manner. Analytical and spectral data confirm the molecular structures of homologues. The average smectic and nematic thermal stabilities are 60.31°C and 79.6°C, respectively, with total mesophase length varying minimum to maximum is 21°C to 57°C at the C6 and C14 homologue, respectively. Thus, present novel azoester homologous series is partly smectogenic and predominantly nematogenic with low ordered melting type and useful to construct LC devices workable at low temperatures or room temperature.
Acknowledgments
The authors acknowledge thanks to Dr. R.R.Shah, principal and management of K. K. Shah Jarodwala Maninagar Science College, Ahmedabad. The authors are also thankful to Dr. A.V. Doshi, Ex-principal of M.V.M. Science College-Rajkot and Dr. H.R. Prajapati of C.U. Shah Science College, Ahmedabad for their constant support, inspirations and help, as and when needed during the course of present investigation. The authors thank the NFDD Centre for the analytical and spectral services.