Research For Host-Guest Interaction Of Endohedral Metallofullerenes And [12] Cyclophenylene

Endohedral metallofullerenes(EMFs)have attracted much attention of scientists due to their unique nesting structures and fascinating intrinsic properties,and are considered to have huge application potentials in quantum computation,photoelectric device and information storage,etc.In this paper,the supramolecular complexs of metallofullerene and[12]cyclophenylene([12]CPP)were prepared.The host-guest interaction between metallofullerene and[12]CPP was studied by means of spectroscopy,nuclear magnetic,etc.,the selectivity of[12]CPP to metallofullerene was explored,and metallofullerene was extracted by non-chromatographic method,which solves the problems of cumbersome,time-consuming and environmental pollution in traditional extraction methods.In addition,the photocurrent experiment was conducted on the formed metallofullerene-[12]CPP composite,and it was found that[12]CPP improved the metallofullerene in photoelectric properties and surface morphology assembly.The details are as follows:Supramolecular complexes of metallofullerenes and[12]CPP were constructed by solution mixing.It was found that the carbon nanorings of[12]CPP can encapsulate the Sc₃N@C₇₈,Sc₃N@C₈₀and Sc₂C₂@C₈₂in size-selective encapsulation method.Fluorescence spectrum titration experiments show that different metallofullerenes have different quenching effects on the fluorescence intensity of[12]CPP,and Sc₂C₂@C₈₂has a stronger quenching effect on[12]CPP.Electrochemical experiments show that the redox potential of the encapsulated metallofullerene will shift negatively,indicating that the composite has a stronger host-guest interaction.Spectral characterization,nuclear magnetic testing and other methods have demonstrated that the addition of metal-organic framework material MOF-177 to the composite,due to its strong attraction to metallofullerene destroys the host-guest interaction of the composite and makes the metallofullerene dissociates from[12]CPP,which provides support for the separation of other supramolecules.Three supramolecular composites of Sc₃N@C₇₈?[12]CPP,Sc₃N@C₈₀?[12]CPP and Sc₂C₂@C₈₂?[12]CPP were spin-coated on fluoride doped tin dioxide(FTO)glass for the electrode,a metallofullerene-[12]CPP conductive film was prepared,and photocurrent measurements were carried out on the three supramolecular composites and the photoconductive properties were studied.It was found that compared with the initial metallofullerene,due to the interaction between the host-guest of the supramolecular complex,the conductive film of the supramolecular complex is more uniform and tight,thereby promoting the effective transport of charge carriers and making the photocurrent of the supramolecular complex response is enhanced,and the photocurrent response generated by Sc₂C₂@C₈₂?[12]CPP is the strongest.Afterwards,a comparative study of the metallofullerene-biphenyl mixture was conducted,which further explained that the host-guest interaction between the carbon nanoring and the metallofullerene composite is the main reason for the stronger photocurrent response.The enhanced photoelectric response of this metallofullerene after being encapsulated,which fully explores the potential applications of metallofullerene and[12]CPP composites in photodetectors and photoactive devices.