S. T. HaY. W. LowAlessandro Volonterio2024-12-302024-12-302013-0110.1155/2013/943723https://dspace-cris.utar.edu.my/handle/123456789/8841A series of new chalcone derivatives with a general formula of C₁₁H₂₇COOC₆H₄COCH=CHC₆H₄X where X=F, Cl, Br, and NO₂ were well synthesized and crystallized from organic solution. The physical properties as well as the chemical formulations of these compounds were determined by spectroscopic techniques (FTIR, and ¹H and ¹³C NMR). Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) techniques were employed to study their transition temperatures and mesophase characteristics. DSC thermograms of compounds with fluoro and nitro substituents displayed direct isotropization and recrystallization during heating and cooling processes. Chloro and bromo analogues exhibited Cr₁‐to‐Cr₂ transition within the crystal phase region. It was also found that enone linkage showed fewer tendencies to exhibit mesomorphic property compared to imine linkage. However, when enone linkage is combined with other central linkages and additional phenyl rings, it turns conducive to mesomorphism.journal-article