The Functional Molecular Assemblies Constructed From Carboxyl Porphyrin Dimers And Bridged Cyclodextrins

Functional molecular self-assembly is one of the most important hotspots in supramolecular chemistry and material science.Benefitting from their special advantages,porphyrin and cyclodextrin,two main building blocks,are widely utilized to construct novel functional assemies.Particularly,the effective combination of these two building blocks via host-guest interaction play key roles in the development of molecular self-assembly.It is the single porphyrin that mainly investigated in the recent porphyrin/ cyclodextrin self-assembly systems.However,the porphytin dimers,in which two porphyrins were bridged by functional linkers,can be utilized as novel building blocks and provide more abundant assembly behaviors.Hence,in this paper,two porphyrin dimers and a series of bridged polycyclodextrins are chosed as building blocks to construct novel functional assemblies via host-guest interaction.The main contents of this paper are as follows:1.The concept and development of supramolecular chemistry and molecular self-assembly are briefly introduced,and the latest researches on the functional molecular self-assembly based on porphyrin with/without cyclodextrin are reviewed.2.Benzene-bridged carboxyl porphyrins and azobenzene-bridged permethylated ?-cyclodextrin were synthesized as building blocks.Taking advantage of photoisomer of azobenzene,nanosheets and nanoparticles were successfully constructed by the introduction of trans-/cis-azobenzene-bridged cyclodextrin through host-guest interaction.Furthermore,these two nanoassemblies realized reversible conversion under light irradiation with different wavelengths.Thereafter,their applications in energy transfer and cell imaging were fully investigated.3.The benzene-bridged carboxyl porphyrin and triphenylbenzene-/ tetraphenylethylene-bridged cyclodextrin trimer/tetramer were synthesized as building blocks,by which a series of nanosheets were constructed.Benefitiing from the cage-like unit in the nanosheet,their fullerene capture behaviors in aqueous solution were further investigated.4.The flexible azobenzene-bridged porphyrin and Zn-porphyrin-bridged cyclodextrin tetramer were synthesized and applied to construct multidimensional nanoassembly.As the cage-like units in the nanoassembies and strong ?-? interaction between porphyrin and fullerene,this nanoassembly displayed high binding ability to C60 in aqueous solution.The complexation can also clear the nitroxide radical in aqueous solution.