Effect of exchange of terminal substituents on the mesophase behavior of laterally methyl substituted phenyl azo benzoates in pure and mixed systems

MM Naoum, AA Fahmi, MA Alaasar, NHS Ahmed

Index: Naoum; Fahmi; Alaasar; Ahmed Thermochimica Acta, 2011 , vol. 525, # 1-2 p. 78 - 86

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Citation Number: 2

Abstract

Two groups of the formulae, 4-(4′-hexyloxy) phenylazo-2-(and 3) methyl phenyl-4 ″- substituted benzoates (Ia–e and IIa–e) were prepared and investigated for their mesophase behavior. Each group consists of five derivatives that differ from each other by the terminal polar substituent X which varies between CH3O, CH3, Br, NO2, and CN. Two other isomeric groups, IIIa–e and IVa–e, that exchange the terminal substituents, X and C6H13O, were ...