In this study, the thermal and optical characterization of a novel supramolecular liquid crystalline which is synthesized from the binary complex of 4-octyloxy benzoic acid (8OBA) and azelaic acid (AZA) has been investigated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The hydrogen bonding that occurs between 8OBA and AZA has been verified by attenuated total reflection- infrared spectroscopy (ATR-IR). DSC and POM results show that the new supramolecular complex exhibit liquid crystalline properties. The 8OBA + AZA binary complex shows four phase transition peak during continuous heating and cooling by DSC. All of these phase transitions are first order transition, and the nematic phase thermal stability is higher than smectic mesophase thermal stability. The phase transition temperatures obtained during continuous heating are higher than the phase transition temperatures obtained during the continuous cooling, but the nematic range is lower.
Keywords: Hydrogen bonded liquid crystals, Thermal properties, Optical properties.