(A) The monomers, mole ratios, and curing conditions used in the synthesis of protected catechol-containing networks, and a schematic network fragment showing a CAT cluster. (B) A scheme of the cleavage of the silyl protective groups and subsequent iron complex formation, and a depiction of the swelling of a test specimen during the process. (C and D) Schematics of the network structure before (C) and after (D) iron treatment, illustrating mono-, bis-, and tris-complexation.