Abstract
A series of methyl 3,5-bis(3,4,5-trialkyloxybenzoylamino)-4-methylbenzoates (alkyl = CH3(CH2)n−1, n = 8, 10, 12, 14 and 16) exhibits mesomorphic behavior at temperatures between 120 and 240 °C. The liquid crystalline properties have been characterized using differential scanning calorimetry, optical polarization microscopy and X-ray diffraction. The molecules stack in columns which pack under hexagonal symmetry. Variable temperature infra-red absorption measurements provide evidence of intermolecular hydrogen bonding between the amide entities in both the crystalline and liquid-crystalline phases.
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