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Abstract
Two new mesogenic homologous series having following general structural formula have been synthesized.
In series-I, n-octyloxy and n-dodecyloxy derivatives exhibit enantiotropic smectic A phase whereas n-decyloxy and n-tetradecyloxy derivatives exhibit monotropic smectic A phase, rest of the members are non-mesogenic. Looking to the terminally branched alkyl group smectogenic tendency of series-I is quite interesting.
In series-II, all the members exhibit enantiotropic nematic phase. The smectic C mesophase commences from the n-heptyloxy derivative and is exhibited alongwith nematic phase till the last n-hexadecyloxy derivative studied. Though branching is known to be less conducive to mesomorphism, it is observed that entire series-II is mesomorphic in nature.