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TD-DFT (IEFPCM-B3LYP/6-311++G(d,p)) calculations have been performed to investigate the relationship between the absorption and fluorescence spectra of 4-aminophthalimide (4AP) and the formation of different types and numbers of hydrogen bonds in water solution,especially to study the effects of hydrogen bond formation and weakening upon photoexcitation on the red- and blue-shifts of the spectral peaks.