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A pyrrolidino[60]fullerene 1 with pyrrolidine group was synthesized and characterized. The UV-Vis spectra showed that the blue shift of absorption peaks was first observed when strong organic acids such as p-toluene sulfo-nic or trifluoroacetic acid were added to the solution of pyr-rolidino[60]fullerene 1 in dichloromethane. The results indicated that the pyrrolidino[60]fullerene derivatives without pyrrolidine group also possess the same phenomenon. Experiments and computation with the MOPAC 7.0 semi-empirical PM3 method demonstrated the reason that some energy gaps on [60]fullerene skeleton were increased because electronic charges on [60]fullerene framework transferred to pyrrolidine ring when strong organic acids were added into pyrrolidino[60]fullerene derivatives’ solution; as the result, the complexes could be formed and some absorption wavelengths blue shifted in the UV-Vis spectrum.
The UV-Vis spectra showed that the blue shift of absorption peaks was first observed when strong organic acids such as p-toluene sulfonic-acid or trifluoroacetic acid were added to the The results indicated that the pyrrolidino [60] fullerene derivatives without pyrrolidine group also possess the same phenomenon. Experiments and computation with the MOPAC 7.0 semi-empirical PM3 method demonstrated the reason that some energy gaps on [60] fullerene skeleton were increased because electronic charges on [60] fullerene framework transferred to pyrrolidine ring when strong organic acids were added into pyrrolidino [60] fullerene derivatives’ solution; as the result, the complexes could be formed and some absorption wavelengths blue shifted in the UV-Vis spectrum.