Fig. 4.

Homochirality evolution in the hierarchical assembly. a Directional site-specific binding in the hierarchical assembly. The STM image sizes of valinomycin monomer, tetramer, and supramolecular network portion are 3 nm × 3 nm, 6 nm × 6 nm, and 12 nm × 12 nm, respectively. The directional binding sites were highlighted with circles and arrows. b Schematic diagram of the recognition way of subunits in the hierarchical assembly. c Schematic drawing of the homochirality evolution in the hierarchical assembly