| Since endohedral lanthanum metallofullerenes were discovered in 1991, the study of EMF has never been interrupted during the following twenty years. Because of its unique electronic structure and special physical and chemical properties, EMF can be used as a good electron donor or acceptor, which made EMF have potential applications in many fields.The yield of EMF in the raw soot was so low that the sample cannot be characterized with many methods currently, which had a great hindrance to the research progress and application of EMF. Thus, through comparing with the preparation and extraction methods, the method leading to maximum yield was determined finally in this paper.In this paper, endohedral metallofullerenes were synthesized by DC arc discharge method. The raw soot were prepared under optimum conditions and then extracted by various methods. After comparison, the separation steps were determined:the raw soot was subjected to sochlet extraction with CS2, and reflux with DMF and pyridine. Then high performance liquid chromatography (HPLC) was used for the final separation. A series of fullerenes and EMS were obtained, such as C76, C78, C82, C84, C86, C90, C96, YC80, YC82, Y2C84, Y2C86, Y2C90, Y3NC80 and three isomers of C94. UV-vis-NIR was conducted to analyze C94 properties.In this paper, C60 and 3-triphenylmethyl-5-oxazolidinone were reacted to give the mono-adduct and di-adduct. |
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