Abstract
The bathochromic shifts of absorption and emission bands upon the protonation of dicyclopentano[b,e]pyridines fall in the range of 3500-5500 cm−1. Both the neutral and protonated forms show high fluorescence quantum yields. The spectral and acid–base properties of these compounds may be varied within a broad range by introducing electron-donor substituents into the aromatic side rings. The protonation constants in the ground and excited states of each of these compounds have similar values as a result of steric hindrance arising upon protonation of the pyridine nitrogen atom.
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