Construction Of Two Supramolecular Assemblies And Their Fluorescent Behavior Research

Supramolecular assembly is the system based on molecular recognization. Functionalized supramolecular assembly can be used as the prototype to construct molecular devices and molecular machines (including rotaxanes and catenanes). In the past few years, the research on the construction and peoperties of molecular devices and molecular machines has become one of the key topic of supramolecular chemistry and exhibited great potential in fields of energy、material、environment and medicine. On basis of the above background, we have designed and synthesized two new supramolecular assemblies based on crownether and cyclodextrin. Their photophysical properties and applications were further studied. The details are as follows:1. The research background and development of molecular devices and molecular machines in supramolecular chemistry.2. The synthesis of bistable [3]rotaxane based on modified dibenzo[24]-crown-8 and its pH-controlled intramolecular charge transfer (ICT) behavior. The The ICT process occurred between the pyrene moiety and the naphthalenediimide (NDI) unit, and the addition of acid and/or base can adjust the intensity of ICT. This bistable [3]rotaxane represents a new prototype of performing photophysical function by adjusting the spacial distance between donor and acceptor in mechanically interlocked molecules.3. The synthesis ofβ-cyclodextrin (P-CD) modified carbon nanocrystals and its photoinduced electron transfer (PET) behavior. The introduction ofβ-CDs efficiently increased the quantum yield. The PET process between DETA-β-CD-CNCs and (ferrocenylmethyl)trimethylammonium iodide (Fc+) can been modulated by 1-adamantanecarboxylic acid sodium salt (Ad-).4. The synthesis of (3-cyclodextrin modified carbon nanocrystals. The introduction ofβ-CDs efficiently increased the quantum yield and significantly increase its solubility of the water insoluble drug, ibuprofen. We also investigated its complex behavior with ibuprofen by means of NMR and fluorescence spectroscopy and its possibility as fluorescent drug carrier for ibuprofen.