Isolation And Chemical Modification Of Terbium Embedded Metal Fullerenes

Fullerene interior can host atoms, molecules, and metal clusters of many types, forming a new family of hybrid materials known as endohedral metallofullerenes. Because of its unique electronic structure and special physical and chemical properties that made EMF have potential applications in many fields.Endohedral metallofullerenes(EMFs), a typical terbium were studied in this paper,which has been synthesized by an improved DC arc discharge method, and the produced soot was extracted with CS2. A series of pure diterbium endohedral metallofullerenes and nitride cluster endohedral metallofullerenes were obtained by multi-stage high performance liquid chromatography(HPLC) separation, such as Tb2C84,Tb2C90,Tb2C92,Tb2C94 and Tb3N@C80,Tb3N@C82, Tb3N@C84,Tb3N@C86,Tb3N@C88.The derivatives of diterbium fullerenes were successfully synthesized through the photochemical reaction of a large carbon cage based diterbium fullerene Tb2C90 with 2-admantane-2,3-[3H]-diazirine. The monoadduct isomer and bisadduct isomer, Tb2C90 Ad and Tb2C90Ad2(Ad=admantylidene), were isolated by multi-stage high performence liquid chromatography with toluene as eluent. The study on UV-Vis-NIR adsorption show that the electronic property of Tb2C90 largely pertained in its derivative, it is concluded that open-cage addition of 2-admantane-2,3-[3H]-diazirine to Tb2C90 occurs at [6,6] ring junctions, leading to the formation of the isolated monoadduct Tb2C90 Ad. Cyclic voltammetric determination indicated that the redox potentials of Tb2C90 Ad were systematically shifted cathodically in comparison with pristine Tb2C90 owing to the electron transfer from Ad to carbon cage. The results indicated that the monoadduct had a good oxidation quality.