INTRAMOLECULAR CHARGE-TRANSFER (ICT) AND SOLVATION OF A RIGIDLY LINKED PYRENE N-METHYLINDOLINO DERIVATIVE AND RELATED-COMPOUNDS IN LINEAR ALCOHOLS/

Measurements on a rather rigid and coplanar bichromophoric compound ha ve been carried out with respect to intramolecular charge separation, as well as regarding solvation and lifetime of the CT state in alcohol solutions. The results indicate that the CT step proceeds very effici ently followed by a Stokes shift of the CT emission band governed by t he dielectric relaxation of the solvent (a series of n-alcohols), The average Stokes-shift time, tau(solv) (of a few hundred picoseconds), c orrelates directly with the longitudinal relaxation time, tau(L) = (ep silon(infinity)/epsilon(s))tau(D), of the solvent. The recently develo ped single-shot spectrostreak picosecond technique was used for the co llection of the time-resolved emission spectra.