A. Wiessner et al., INTRAMOLECULAR CHARGE-TRANSFER (ICT) AND SOLVATION OF A RIGIDLY LINKED PYRENE N-METHYLINDOLINO DERIVATIVE AND RELATED-COMPOUNDS IN LINEAR ALCOHOLS/, The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 101(4), 1997, pp. 350-359
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.