A Molecular-Sized Tunnel-Porous Crystal with a Ratchet Gear Structure and Its One-way Guest-Molecule Transportation Property

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Using the crystal engineering process, we constructed an asymmetric tunnel crystal that acted as a molecular-sized linear ratchet motor. The crystal changed the distribution of guest molecules from uniformly distributed to distributed on only one side in a macro-length tunnel. Here, the guest molecules in the tunnel should be stabilized equally by the tunnel wall. The guest molecules simply changed their locations in the tunnel. The movement of the guest molecules would be caused by thermal fluctuation of the crystal lattice.