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A series of liquid crystals 4-X-(3’-ethoxy-4’-alkyoxyphenyimino)anilines with elongated molecular axis through the introduction of alkoxy chains containing different substituents (X = CH 3 , OCH 3  and Cl) were synthesised. The thermal–optical behaviours of these organic magnets were characterised by differential scanning calorimetry and polarised optical microscopy. Elemental analysis, FT-IR and  1 H-NMR were employed to elucidate the molecular structures of the target compounds. Experimental data show that the nematic phase temperature range increases in the order of CH 3  &lt; Cl &lt; OCH 3 . The laterally ethoxy Schiff base-ester liquid crystal with the most electronegative Cl atom is presumed to outweigh both analogues containing CH 3  and OCH 3 , leading to the highest clearing temperature (T c ) value, but the present work proved that the presence of the O atom from OCH 3  is inclined to orientate in a parallel arrangement that increases the length-to-breadth ratio and the polarisability of the molecule. Computational studies on the different substituents against its kinetic stability were carried out based on the variation in the energy value of HOMO–LUMO gap (ΔE gap ). A relationship between the energy gap and the substituents under the present study shows that when the ΔE gap  increases from OCH 3  &lt; Cl &lt; CH 3 , the chemical reactivity decreases, leading to the lowering of the clearing temperature.

Experimental and computational studies of laterally ethoxy Schiff base-ester liquid crystalline magnets