“…The most intensely studied liquid crystals are calamitic ones, which generally contain a rigid core, flexible chains, and linkage units such as ester, ether, azo, and azomethine. [15][16][17][18][19][20] The ester linkage unit is widely used in liquid crystals due to its stability and easy synthesis pathways. On the other hand, the reversible direction of the polar ester linking group influences the polarizability of the molecule and gives rise to significant changes in thermotropic behavior.…”