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Formation of homotactic 2D COF or Sierpiński triangle (ST) from on surface self-condensation of D1 symmetrical 1,3-benzenediboronic acid. (a) STM image of extended honeycomb-like 2D COFs; (b) Schematic representation of the honeycomb network; (c) STM image of a ST-3 pattern; (d) Schematic representation of ST-3. Reprinted from ref. 144 with permission from The Royal Society of Chemistry.
