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Article Abstract
The synthesis and characterisation of the 1-(4-cyanobiphenyl-4'-yl)-10-(4-alkylanilinebenzylidene-4'-oxy)decanes (CB10O·) are reported. This series shows a rich liquid crystal polymorphism including twist-bend nematic and smectic phases. All the homologues reported exhibit an enantiotropic conventional nematic phase. For the homologues with ≤ 10, the local packing in the nematic phases and the layer spacing in the smectic phases indicates an intercalated arrangement of the molecules. An intercalated smectic C phase is observed if /11 ≈ 0.5. Either side of this condition, the twist-bend nematic phase is observed, a novel pattern of behaviour for a series on increasing a terminal chain length. For longer chain lengths, = 12, 14, 16 and 18, two twist-bend smectic C (SmC) phases are observed, and the packing of the molecules is now of a bilayer-type. The higher temperature variant is termed SmC in which SH (single helix) refers to the presence of a short, distorted clock-type helix. In the lower temperature SmC phase, an additional longer helix is superimposed on the short one, and DH denotes double helix.
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