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Two new homologous series of Schiff’s base derivatives with lateral methyl substitution having central cinnamates  VIn  and benzoates  VIIn  moiety were prepared. All the compounds were characterised with infrared, proton magnetic resonance and ultraviolet spectroscopy. Liquid crystalline phase and their transition enthalpies were studied using a polarised optical microscope (POM) and differential scanning calorimetry (DSC), respectively. The electrostatic potential of compounds was measured using DFT calculation. All compounds of both the Series  VIn  and  VIIn  are mesogenic. The homologues  VI1  to  VI12  exhibited enantiotropic nematic mesophase, homologues  VI7  to  VI18  exhibited smectic A mesophase, homologues  VI7  to  VI12  exhibited both enantiotropic smectic A and nematic mesophase. Homologues  VII1  to  VII12  exhibited enantiotropic nematic mesophase, homologues  VII8  to  VII18  exhibited smectic A mesophase, homologues  VII8  to  VII12  exhibited both enantiotropic smectic A and nematic mesophase. The phase transition of the present two series is compared with each other and with three structurally related compounds to evaluate the effect of central linkage and lateral substitution on their mesophase behaviour.

New Schiff’s base cinnamates/benzoates liquid crystals with lateral methyl substitutes: characterisation, mesomorphic behaviour and DFT calculation