Abstract
Five types of non‐symmetric calamitic dimers were synthesized to investigate the effect of the core structure and length of the spacer on mesomorphic properties. Two non‐symmetric dimers containing a troponoid and benzenoid unit showed smectic A and C phases whereas the corresponding benzenoid dimers showed no mesophase. Non‐symmetric dimers with a three‐ring system showed smectic A and C phases with higher transition temperatures than the two‐ring system. We propose packing models for these non‐symmetric dimers by considering the direction of the dipole moments of the ring structures and microsegregation between the polar units and the non‐polar chains.
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