Scheme 1

Three types of supramolecular synthons, (A), (B) and (C), were discussed in this paper. (A) & (B) represent homo and heterosynthons, {\mathit{R}}_2^2\left(8\right), respectively whereas (C) represents a DADA array, {\mathit{R}}_2^3\left(8\right): {\mathit{R}}_2^2\left(8\right): {\mathit{R}}_2^3\left(8\right).