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Synthesis of a new solvent-responsive pillar[5]arene-based [1]rotaxane molecular machine

In this work, we designed a new pillar[5]arene-based molecular machine responsive to the polarity of different solvents, which can exist in an interlocked structure in CDCl3 and CD3OD, and can exist in an extended form in DMSO and was studied by 1H and 2D NMR spectroscopy, HR(MS) and fluorescence spectroscopy.