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(a) Structure of Lehn-type hexameric cyclic helicates 5 and 6. (b) Representative HPTS assay with (FeII)6-coordinated Star of David catenane 3 and hexameric cyclic helicate 6 ([compound] = 2.5 μM, 100 mM NaCl, 20 mM MOPS, pH 7.4). NaOH base pulse (13 μL, 1 M) at 1 min, Triton X-100 (20 μL, 10% v/v solution) at 6 min.
