A series of liquid crystalline star supermolecules with polyhedral oligomeric silsesquioxane (POSS) as the central scaffold and eight triphenylenes (Tp) as the peripheral arms were synthesized via amidization reactions. The supermolecules were denoted as POSS(Tp)8. Six POSS(Tp)8 samples were prepared with two alkyl chain lengths in the Tp (C5 and C12) and three spacer lengths (C2, C6 and C10) between the POSS core and the Tp arms. Three samples with C5-Tp were amorphous because of too short alkyl chains in the Tp, while the other three samples with C12-Tp self-assembled into hierarchical liquid crystalline mesophases, as studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM). When the spacer length was C2, a column-within-column super hexagonal columnar phase was observed, because the POSS core and Tp arms were intimately coupled together. With increasing the spacer length to C6 and C10, respectively, the POSS core and Tp arms became gradually decoupled.

Topology controlled supramolecular self-assembly of octa triphenylene-substituted polyhedral oligomeric silsesquioxane (POSS) hybrid supermolecules

244th National Meeting (2012)

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