Conformational effect on luminescence and polarization of some aniline derivatives. Intersystem crossing from higher singlet states

We present an analysis of emission spectra, obtained in polar and non-polar solvents and at different temperatures, for a series of aniline derivatives excited at different wavelengths. Important changes in the intensity and polarization of the emission are shown to be due to conformational effects of the amino group which strongly changes the molecular desactivation dynamics. This interpretation is shown to be consistent also with the absorption spectra.