Mesomorphic properties of a new homologous series of ortho hydroxyl-functionalized Schiff bases .

Abstract

Abstract Nine members of a homologous series of the Schiff bases [4(4'-n-alkoxy -2- hydroxybenzylidene ) amino biphenyl ] have been prepared and their mesomorphic properties and phase transitions were determined for all compounds by polarizing hot stage microscopy and differential calorimatry for some of them . The properties of this series are compared with those the analogous Schiff bases , the [4(4'-n-alkoxy -2- hydroxybenzylidene ) amino biphenyl ] .The effect of the hydroxyl group in ortho position on the type of liquid crystal phases in this series and thermal stability has been assessed .