67427-93-4Relevant academic research and scientific papers
Effect of Terminal Substituents on Liquid Crystallinity of Some Schiff Base Esters
Dave, J. S.,Kurian, George,Patel, N. R.
, p. 1161 - 1164 (2007/10/02)
Three new series of liquid crystalline schiff base esters, 4-n-alkoxybenzoyloxybenzylideneanilines, with C2H5 (I), OC2H5 (II) and H (III) as terminal substituents have been synthesised and their mesomorphic transitions studied.All the members of the three series (I-III) exhibit liquid crystallinity with good phase length and thermal stability.In the series (I) and (II) the smectic phase begins with hexyloxy and decyloxy derivatives respectively and even the last member studied (C18) exhibits both smectic and nematic phases.In the series (III) the smectic phase appears at the heptyloxy derivative and the C16 and C18 homologues exhibit only the smectic phase.The plots of transition temperatures versus the number of carbon atoms in the alkoxy chain in series (I-III) exhibit smooth relationships.The nematic-isotropic transition temperatures in these series exhibit marked odd-even effect and lie on steep falling curves.The smectic-nematic transition temperatures in all these series lie on steep rising curves and do not exhibit any odd-even effect.The thermal properties of these series are compared with those of similar series.The influence of the terminal groups on mesomorphism is discussed.
