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By usingl－methyl－2－formyl－5－Y－substituted pyrrole（4－nitrophenyl）hydrazones as amodel for nitrogen－containing heterocyclic aromatic compounds． the emission wavelength[λmax(em)]values of their fluorescence spectra have been measured Correlation results show that the△Eem values are mainly affected by polar effects but spin -delocalizatin effects also exist
By using 1-methyl-2-formyl-5-Y-substituted pyrrole (4-nitrophenyl) hydrazones as amodel for nitrogen-containing heterocyclic aromatic compounds. the emission wavelength [λmax (em)] values of their fluorescence spectra have been measured Correlation results show that the ΔEem values are primarily affected by polar effects but spin -delocalizatin effects also exist