Chloroform‐Driven Excited‐State Protonation of Pyrene–Dialkylaniline Derivatives Under Visible Light

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Solvatofluorochromic analysis reveals solvent-specific photochemical transformations in pyrene derivatives, indicating charge dynamics.

The light exposure leads to a unique protonation reaction in chloroform, producing dialkylaniline cations and pyrene anions.
Significant findings reveal a red-shifted fluorescence with solvent polarity changes, peaking in chloroform at specific alkyl chain lengths.
Nanosecond transient absorption spectroscopy uncovers radical ion formation exclusively in chloroform, vital for understanding charge separation.
The reaction's efficiency is influenced notably by the alkyl chain length of dialkylanilines, with C6 demonstrating optimal kinetics.

Dineshkumar et al. (2025) studied this question.

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