Self-assembly of N-3-γ-pyridyl Aza[60]fulleroid on Au(111)

Self-assembled monolayers of novel C60 derivative, N-3-γ-pyridyl Aza[60]fulleroid (C60Py), on Au(111) were studied by a scanning tunneling microscope under ultrahigh vacuum (UHV). C60Py molecules were assembled on Au (111) via pyridyl nitrogen-Au interaction. The sole assembly of C60Py molecules on Au (111) only exhibited randoml aggregation of C60Py even the films were annealed at 50 and 105℃. By co-assembling with benzyl mercaptan (BM), the C60Py- BM films showed highly dense aggregation, but C60Py assemblies still had disordered structure. After the co-assembled C60Py-BM films were annealed at 50℃, BM molecules were partially desorbed, but the assembly of C60Py remained without obvious change. After the co-assembled C60Py-BM films were further annealed at 105℃, the C60Py monolayers with ordered structure were obtained, while the BM molecules were nearly thoroughly desorbed from the surface. Here, the BM molecules play a key role as a surfactant in the formation of the ordered C60Py monolayer.

Self-assembled monolayers of novel C60 derivative, N-3-y-pyridylAza[60]fulleroid (C_(60)Py), on Au(111) were studied by a scanning tunneling microscope underultrahigh vacuum (UHV). C_(60)Py molecules were assembled on Au (111) via pyridyl nitrogen-Auinteraction. The sole assembly of C_(60)Py molecules on Au (111) only exhibited randoml aggregationof C60Py even the films were annealed at 50 and 105 deg C. By co-assembling with benzyl mercaptan(BM), the C60Py-BM films showed highly dense aggregation, but C60Py assemblies still had disorderedstructure. After the co-assembled C60Py-BM films were annealed at 50 °C, BM molecules werepartially desorbed, but the assembly of C_(60)Py remained without obvious change. After theco-assembled C_(60)Py-BM films were further annealed at 105 deg C, the C_(60)Py monolayers withordered structure were obtained, while the BM molecules were nearly thoroughly desorbed from thesurface. Here, the BM molecules play a key role as a surfactant in the formation of the orderedC_(60)Py monolayer.