Stimuli-Responsive Folding and Unfolding of a Polymer Bearing Multiple Cerium(IV) Bis(porphyrinate) Joints: Mechano-imitation of the Action of a Folding Ruler.

A pivotal guest role: A new porphyrin polymer, poly(PorZn⋅DD) (see picture, pink/purple), composed of a porphyrinatozinc and a porphyrin double‐decker complex as a repeating unit was synthesized. In poly(PorZn⋅DD), porphyrinatozinc complexes recognize a divalent amine (tan/red) to induce an intramolecular pivoting motion through the rotation of porphyrin double‐decker complexes and the polymer undergoes shortening and compaction. [ABSTRACT FROM AUTHOR]