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Molecular structures of (a) blue-, green-, and orange-emitting photoluminescent cyclic compounds 1, 2, and 3. (b) Rotaxane-based supramolecular mechanoluminophores Rot-1, Rot-2, and Rot-3. (c) Mechanoactive polyurethanes into which the supramolecular mechanoluminophores were individually incorporated. Rot-X represents Rot-1, Rot-2, or Rot-3.
