Supermolecular Liquid Crystals - Liquid Crystalline Functional Assemblies and Their Supramolecular Structures - page 35

Fig. 40 Structure of dendromesogen 39 . The results below the structure show that it is not
monodisperse
dendrimer 40 , see Fig. 42 [85]. In this case, however, the thermal stability of
the smectic C phase is greatly reduced, whereas the stability of the smectic
A phase is retained. However, because the mesogens are decoupled from the
scaffold to a large degree, the material crystallized rather than formed a glassy
phase.
As noted earlier, in general, as for traditional side-chain liquid crystal
polymers, the end-on attachment of the mesogenic moieties affords smectic
phases, whereas side-on mesogenic sub-units lead to nematic phases. By ap-
pending laterally attached chiral mesogenic units to the octasilsesquioxane
scaffold the induction of the chiral nematic phase into this class of materi-
als was targeted. Supermolecule 41 , see Fig. 43, the size of a small globular
protein (i.e., M W = 6560), was prepared as a single material with a disper-
sity of 1, and as predicted it exhibited a chiral nematic phase with a helical