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Abstract-In this paper, a series of new Schiff-bases: 2,4-bis (4'-n-nonyloxy -benzoyloxy)benzylidene-4''-n-alkyloxyaniline (DC 9 A n ) were synthesized. The characterization of compounds was achieved through using (ultra violet, infrared, 1 H-nuclear magnetic resonance) measurements. This series comprises 10 members differ by the length of n-alkoxy chain (i.e., OC n H 2n+1 , n=1-10). Their liquid crystalline properties were studied using differential scanning calorimetry and polarizing optical microscopy. The lower series such as n=1-3 are purely nematogenic liquid crystals, but the other means (n=4-7) have nematic and smectic phases (S m C and S m A). The higher members (n=8-10) are purely smectogenic liquid crystals.

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