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The excited state structural relaxation of 4-dimethylaminobenzenes with various para-acceptorsubstituents having double-band emission, local excited (LE) andcharge transfer (CT), has been investigated. Fluorescencemeasurements at different temperatures and in different solventshave confirmed the existence of viscosity-dependent, temperature,and polarity-activated relaxation. The kinetics analysis has shownthat the radiative deactivation rate constants of the individualLE and CT states differ by 7–112-fold. The dipole momentchanges at the excitation for CT states are significantly largerthan those for LE states. The spectral-kinetics behavior ofcompounds studied agrees with the models A→A∗→B∗ or A→A∗↔B∗, where A∗ is the local excited planar and B∗ is the relaxed twisted state of the molecule.The rate constants of the twisted state formation have beencalculated in the temperature range 293–77 K. The activation energies of forward process for compounds studied havebeen estimated

The dynamics of excited state structural relaxation of 4-dimethylaminobenzonitrile (DMABN) and related compounds