Abstract
Abstract Carbonyl p-derivatives of N,N-dimethylaniline relax in the excited state to the highly polar (TICT) state with a twist of one of the substituents. Model compounds were synthesized with either the carbonyl or amino group fixed (VIII and IX, resp). It is found that the intramolecular rotation of the amino group is responsible for the TICT state formation. The carbonyl compounds VI-IX show anomalies in their photophysical kinetics (temperature and excitation energy dependencies of the quantum yields).
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