Abstract
A new group of liquid crystalline materials, denoted as (E)-4-(((4-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)phenyl)imino)methyl)phenyl 4-(alkoxy)benzoate (In), was synthesized from maleic anhydride and investigated for their mesomorphic and optical properties. This group includes four derivatives with different flexible chain lengths (6, 8, 10, and 12 carbons) attached to the phenyl ring near the ester bond. Polarized optical microscopy (POM) and differential scanning calorimetry (DSC) were carried out to examine their mesophase characteristics. The thermogravimetric analysis (TG) was employed to evaluate the thermal stability of the homolog set (I6). Molecular structures were characterized using NMR, FT-IR, and elemental analysis techniques. All the produced derivatives show enantiotropic nematic mesophases, according to the results. The range and stability of the produced nematic phase are affected by the introduction of the heterocyclic maleic anhydride unit into the molecular structure. Furthermore, comparison with short-size documented derivatives establishes that the addition of extra phenyl azomethine moiety in the molecular structure induces the formation of nematic phases.
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