| Molecular machines feature prominently the assembly by two or more molecular units and are provided with specifical functions in response to multi-stimuli. These systems show an increasing potential for materials and biological applications. In this paper, several cyclodextrin-based supramolecular rotaxanes or pseudorotaxanes were constructed and investigated via NMR, MS, UV-Vis etc.The main contents and results are generalized as follows:In Chapter 1, the research background of molecular machines and design was introduced. The introduction of the molecular machines and design consisted of three units:the basic definition, the species and the potential applications.In Chapter 2, three low-molecular weight compounds (LMWMs) for supramolecular polymerization were synthesized and two different non-covalent interaction, the metal-ligand interaction and the host-guest binding, were employed. Routes for stepwise introduction of two of the self-assembly behaviors were the same as a one-pot preparation.In Chapter 3, two fluorescent guest compounds (OVN and MVN) for supramolecular bindings at different sites with cucurbit[7]uril (CB7) andα-cyclodextrin (α-CD) were synthesized. The selective supramolecular bindings of CB7 andα-CD would cause a stepwise variation of the fluorescent signal output in OVN guest system. On the other hand, supramolecular bindings could only lead to a binary signal change in MVN guest system.In Chapter 4, a bis-branched molecular shuttles were constructed via quantitative coordination. In particular, transformation of ring shuttling direction was observed in the bis-branched Pt(Ⅱ) complex. Theα-CD ring in the pseudorotaxane took place a dethreading behavior to depart from the axles, but the ring behaved an inward shuttling motion along the axles in the bis-branced Pt(Ⅱ) ensemble.In Chapter 5, some other work was introduced. An azobenzene-based shuttle in response to photochemistry was designed to mimic artificial muscle-like material.In Chapter 6, conclusion. |
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