By the DC arc-discharge of graphite rods doped with other substances in He and NH3 mixing gas,higher endohedral metallofullerenes(EMFs) were synthesized in a high yield. This lays the foundation for the separation,pur...By the DC arc-discharge of graphite rods doped with other substances in He and NH3 mixing gas,higher endohedral metallofullerenes(EMFs) were synthesized in a high yield. This lays the foundation for the separation,purification and further study of higher EMFs. The doped materials act as heat carriers and at the same time catalyze the growth of higher EMFs,whereas NH3 suppresses the formation of fullerenes such as C60 and C70,etc.展开更多
The adsorption and molecular orientation of Dy@Cs2 isomer I on Au（111） has been investigated using ultrahigh-vacuum scanning tunneling microscopy at 80 K. At low coverages, the Dy@Cs2 molecules tend to grow along th...The adsorption and molecular orientation of Dy@Cs2 isomer I on Au（111） has been investigated using ultrahigh-vacuum scanning tunneling microscopy at 80 K. At low coverages, the Dy@Cs2 molecules tend to grow along the step edges of Au（111）, forming small clusters and molecular chains. Adsorption of Dy@Cs2 on the edges is dominated by the fullerene-substrate interaction and presents various molecular orientations. At higher coverages, the Dy@Cs2 is found to form ordered islands consisting of small domains of equally oriented molecules. The Dy@Cs2 molecules in the islands prefer the adsorption configurations with the major C2 axis being approximately parallel to the surface of the substrate. Three preferable orientations of the Dy@Cs2 molecules are found in a two-dimensional hexagonal close packed overlayer. These observations are attributed to the interplay of the fullerene-substrate interaction and dipole-dipole interaction between the metallofullerenes.展开更多
文摘By the DC arc-discharge of graphite rods doped with other substances in He and NH3 mixing gas,higher endohedral metallofullerenes(EMFs) were synthesized in a high yield. This lays the foundation for the separation,purification and further study of higher EMFs. The doped materials act as heat carriers and at the same time catalyze the growth of higher EMFs,whereas NH3 suppresses the formation of fullerenes such as C60 and C70,etc.
基金V. ACKNOWLEDGMENTS We thank Professor Shi-he Yang from the Hong Kong University of Science and Technology for supplying Dy@Cs2. This work is supported by the National Natural Science Foundation of China （No.10825415）.
文摘The adsorption and molecular orientation of Dy@Cs2 isomer I on Au（111） has been investigated using ultrahigh-vacuum scanning tunneling microscopy at 80 K. At low coverages, the Dy@Cs2 molecules tend to grow along the step edges of Au（111）, forming small clusters and molecular chains. Adsorption of Dy@Cs2 on the edges is dominated by the fullerene-substrate interaction and presents various molecular orientations. At higher coverages, the Dy@Cs2 is found to form ordered islands consisting of small domains of equally oriented molecules. The Dy@Cs2 molecules in the islands prefer the adsorption configurations with the major C2 axis being approximately parallel to the surface of the substrate. Three preferable orientations of the Dy@Cs2 molecules are found in a two-dimensional hexagonal close packed overlayer. These observations are attributed to the interplay of the fullerene-substrate interaction and dipole-dipole interaction between the metallofullerenes.
