A new homologous series viz. 4-(3-(3, 4-dioctadecyloxy) phenyl)-3-oxoprop-1-en-1-yl) phenyl-3-(4-n-alkoxy phenyl) cinnamate) based on two linking groups have been synthesized and characterized. The mesomorphic properties of these compounds were observed by optical polarized light microscopy (POM) and confirmed by differential scanning calorimetry (DSC). All synthesized compounds exhibited LC behaviour except compound C-1. Thermal stability of smectic and nematic phase of present series are 79.0 degrees C and 120.0 degrees C whose temperature range is vary from 14 to 20 degrees C and 24 to 56 degrees C respectively. The mesomorphic properties of present series were compared with other structurally related mesogenic homologous series to evaluate the effects of tail group on mesomorphism.