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Abstract
Eleven novel mesomorphic homologues were synthesized and evaluated for their mesomorphic properties. The methoxy to n-butyloxy homologues are nonmesomorphic, while the other homologues are enantiotropic mesomorphic. The n-pentyloxy, n-hexyloxy, and n-octyloxy homologues are polymesomorphic, i.e., smectic and nematic mesophases are exhibited enantiotropically. Only the nematic mesophase is exhibited by the n-decyloxy to n-hexadecyloxy homologues. Analytical data confirm the structure and textures of molecules. The nematic mesophase shows a threaded-type texture, and that of smectic phase is of smectic A type. The mesomorphic properties are compared with a structurally similar homologous series. The average thermal stability for the smectic and nematic mesophases is 154.6°C and 163.8°C, respectively, as observed through optical polarizing microscope with heating stage.
Acknowledgments
The authors acknowledge and thank the chairman and all the members of the management of Bai Jivkor Lallubhai Trust as well as the Principal Dr. R. R Shah and Head of the chemistry department Dr. R. B. Patel of K. K. Shah Jarodwala Maninagar Science College for their high valued co-operation in this work. Also, thanks are due to the Vaibhav Laboratory for analytical services as well as authorities of Arts & Science college Godhra for their valuable co-operation.