Spectral broadening and kinetic properties of a dapoxyl fluorescent probe

The steady-state spectra of Dapoxyl in polar solutions under selective excitation demonstrate considerable spectral inhomogeneity (about 600 cm(-1)) in the case of a high viscosity solution. The time characteristics of the luminescence decay in different spectral regions and a long-wavelength shift of the instantaneous emission spectra indicate the occurrence of relaxation processes leading to a decrease in the excited-state energy. A correlation between the luminescence spectra and the processes of intermolecular orientational relaxation of the solution is established.