Study On The Molecular Assembly Behavior Of Water-soluble Macrocyclic Body Calpyridine Salt With Sodium Alginate, Sodium Naphthalene Sulfonate, Sodium Pyrene Sulfonate And Sulforhodamine B

Supramolecular chemistry is a new subject that has attracted much attention and developed rapidly in recent years.Its development is closely related to the development of macrocyclic chemistry and it is gradually becoming a relatively independent research field.Supramolecular amphiphilic assemblies are widely used in biology,medicine and material chemistry because of their good properties.Supramolecular chemistry is concerned with molecular recognition and assembly of molecules formed by non-covalent bond interactions between molecules.In order to better reveal the nature and characteristics of the molecular assembly behavior between host and guest,the following works were performed:1.We compared the supramolecular assemblies formed by calixpyridinium with two alginates(SA-L and SA-M)with different viscosity.We found that the electrostatic interaction between SA-M and calixpyridinium was stronger,and it had a better ability to induce calixpyridinium aggregation.Therefore,the supramolecular assembly of calixpyridinium–SA-M is a dense spherical structure,while the supramolecular assembly of calixpyridinium–SA-L is a non-dense laminar structure.However,for the same reason,the calixpyridinium–SA-L supramolecular assembly is more stable not only at room temperature,but also at higher temperatures,even in salt solutions,than the calixpyridinium–SA-M supramolecular assembly.SA is an important biomaterial with good biocompatibility.Therefore,this comparative study is of great significance not only to further understand the assembly process of calixpyridinium and polyanion,but also to construct functional supramolecular biomaterials.2.We investigated the host–guest interactions between calixpyridinium and seven sodium naphthalene sulfonate in aqueous solution.Under different pH conditions,different naphthalene sulfonates interacted with calixpyridinium differently.Not only that,but also the shape of the assembly was also quite different.Among them,1-SNS and 2NS were simply bonded with calixpyridinium and did not form a perfect assembly.1,5-NDS,2,6-NDS and 2,7-NDS could be assembled with calixpyridinium to form solid spherical assemblies.However,after complexing with 1,6-NDS and NTS guest,calixpyridinium could self-assemble to form a hollow spherical assembly.This indicated that the position of substituents on naphthalene ring greatly affected the morphology and properties of naphthalene ring complexed with calixpyridinium.Therefore,different morphologies could be used to detect the type of naphthalene sulfonate,and the hollow spherical structure could also be used in medicine for drug loading.3.We investigated the host–guest interactions between calixpyridinium and two pyrene sulfonates in aqueous solution.PS and calixpyridinium assembled into a spherical assembly.However,PyTS and calixpyridinium assembled into a rod assembly.Self-assembled spherical calixpyridinium–PS supramolecular assembly could not emit fluorescence in the solid state,while self-assembled calixpyridinium–PyTS supramolecular assembly exhibited strong green fluorescence in the solid state due to the perfect ?-? interaction of PyTS molecules induced by the complexation of calixpyridinium.More importantly,we found that the solid calixpyridinium–PyTS supramolecular assembly could be used as novel iodine adsorbents not only in aqueous solution but also in the gas phase.Therefore,it can be applied to the storage of pollutants.However,the solid spherical calixpyridinium–PS supramolecular assembly could not adsorb iodine.The different iodine adsorption capacity of the two supramolecular assemblies depended on their self-assembled structures at the molecular level.4.We investigated the host–guest interactions between sulfonyl rhodamine B(SRB)and multiple macrocyclic hosts in aqueous solution.SRB had a very weak bond with ?-cyclodextrin and ?-cyclodextrin,but SRB and ?-cyclodextrin could assemble into a network structure formed by the combination of small thin lines.The different binding behaviors between the three cyclodextrins and SRB were mainly caused by their different sizes,and the size of ?-cyclodextrin was most suitable for SRB.SRB and calixpyridinium assembled to form a lamellar assembly.The ?-cyclodextrin–SRB supramolecular amphiphilic assembly was not sensitive to pH.The calixpyridinium–SRB supramolecular amphiphilic assembly was not sensitive under acidic conditions,but the color of the solution would change from pink to red under alkaline conditions.Therefore,it was expected to be used as a testing material for alkaline substances in the future.