Indolyl alkali-metal ion pairs in the excited state. Part 3.—Solvent-excited solute relaxation in the S1- and T1-states

Abstract

The solvent-excited solute relaxation parameters of indolyl alkali-metal ion pairs in 2-methyltetra-hydrofuran in the first excited singlet state are derived from temperature dependent steady-state fluorescence measurements. Furthermore the phosphorescence spectra and lifetimes at –196°C are reported.

It is concluded that the structures of the phosphorescent ion pairs at –196°C are the same as in the ground state and that the solvent reorientation is completely realized within the lifetimes of the triplet states.