Synthesis And Properties Of Macrocyclic Molecule Modified Silver Nanoparticles

Metal nanoparticles(NPs),especially of silver and gold,have attracted much attention due to their remarkable optical,electrical and chemical properties.The introduction of organic ligands onto NP surfaces provides not only stability to these nanoentities in different solvents,but also desirable surface functionalities.Calixarenes and cyclodextrins,can be not only carded out the chemical modification in a selective manner but also possess excellent molecule recognition abilities.Thereafter,we carded out the research of the synthesis and properties of metal nanoparticles modified with the functioned calixarenes and cyclodextrins.Through the research,we obtained a series of important results,which are shown as follows:1.Reacting p-tert-butylcalix[7]arene with phosphorus pentachloride and then with water afforded two p-tert-butylcalix[7]arene-diphosphate stereoisomers,which were characterized by elemental analysis,¹H NMR,ESI-MS,and ³¹p NMR spectra.The more accurate conformations of them were investigated with the aid of Gaussian03 calculations.2.The water-soluble p-sulfonatocalix[4,8]arene-modified silver nanoparticles, which were stable and uniform in aqueous solution,were synthesized via one-pot protocol and characterized by transmission electron microscopy(TEM),FT-IR and Uv-vis spectroscopy.It was found that the p-sulfonatocalix[4]arene-modified silver nanoparticles can be utilized as a colorimetric probe for histidine and optunal in water. The possible mechanisms were discussed.3.The cyclodextdn-modified silver nanoparticles were prepared through the similar method and characterized by transmission electron microscopy(TEM),FT-IR and Uv-vis spectroscopy.It was observed that the modified silver nanoparticles can be used as a colorimetric sensor for discriminating D- and L-histidine.The possible mechanism was investigated.