Studies on the Phosphorimetric Determination of Amines with Halonitro Compounds. II. Substituent Effect on the Fluorescence and Phosphorescence of 4'-Substituted 4-Nitrodiphenylamines and 2-(Substituted Anilino)-5-nitropyridines

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Substituent effects on the fluorescence and phosphorescence of 4'-substituted 4-nitrodiphenylamines and 2-(substituted anilino)-5-nitropyridines at 77°K were examined, and satisfactory linear relationships between Hammett's substituent constant σ and the lowest excited singlet energy levels, the lowest excited triplet energy levels, and the triplet decay constants of the compounds were obtained.