A new homologous series has been synthesized and studied to explore the impact of adding alkyl chains and a fused heterocyclic ring on mesomorphic properties. The series includes 12 homologues (G1-G12), all of which exhibit smectic mesophase. Textural analysis and phase transition temperatures were measured using polarizing optical microscopy with a heating stage. The molecular structures were confirmed using 1H NMR, FTIR, and mass spectrometry. The incorporation of the 5-amino benzo [1,3] dioxole ring into the molecular structure improved thermal stability, with all derivatives maintaining stability between 48.3°C and 140.4°C. The average thermal stabilities for the smectic was significantly higher than those commonly seen in similar compounds, offering valuable insights for the development of liquid crystalline materials.
