SYNTHISES AND STUDY THE MESOMORPHIC PROPERTIES OF NEW TWO SERIES OF COMPOUNDS CONTAINING AZO METHINE LINKAGE

Two series of Schiff,s bases compounds have been prepared. The new compounds having the name 4 (4-Flouro benzoyloxy) benzylidene-p-substituted aniline and 4 (4- Methoxy benzoyloxy) benzylidene–p-substituted aniline .The new derivatives were prepared from the reaction between different substituted aniline and 4(4-Flouro benzoyloxy) benzaldehyde, 4(4-Methoxybenzoyloxy) bezaldehydes (Schiff,s bases) in presence of glacial acetic acid and absolute ethanol. The resulted compounds were exhibited liquid crystalline properties .The liquid crystalline properties were studied by hot–stage polarizing microscopy and confirmed by DSC (differential Scanning Calorometry) studies. All products show nematic mesophase. The molecular structures of the resulted compounds were identified by IR spectra and H1NMR for starting material, Mass spectrum also for starting material and the melting points were checked