Fig. 1. Schematic illustrations of supramolecular-scaffold-directed 2D assembly.

(A) A typical 2D + 1D structure of self-assembled tripodal triptycene derivatives, (B) a tripodal triptycene–based sandwich-type molecule in which the bridgehead positions are connected with an acene chromophore (pentacene or anthracene), and proposed assembly structures formed from (C) pentacene- and (D) anthracene-containing derivatives. The lengths for the longer axis of anthracene and pentacene are estimated to be 0.92 and 1.40 nm, respectively. On the basis of the PXRD patterns of the assemblies of acene-containing derivatives (Fig. 3, A and B), the pentacene units are considered to be slightly tilted with respect to the 2D triptycene lattice, while the anthracene units are randomly oriented in the 2D plane.