Journal of Physical Chemistry A, Vol.101, No.4, 350-359, 1997
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 have 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 efficiently followed by a Stokes shift of the CT emission band governed by the dielectric relaxation of the solvent (a series of n-alcohols), The average Stokes-shift time, tau(solv) (of a few hundred picoseconds), correlates directly with the longitudinal relaxation time, tau(L) = (epsilon(infinity)/epsilon(s))tau(D), of the solvent. The recently developed single-shot spectrostreak picosecond technique was used for the collection of the time-resolved emission spectra.
Keywords:DONOR-ACCEPTOR SYSTEMS;ELECTRON-TRANSFER;POLAR-SOLVENTS;NONEQUILIBRIUM SOLVATION;POLARIZATION DIFFUSION;DESICCANT EFFICIENCY;TRANSIENT ABSORPTION;DIELECTRIC FRICTION;DYNAMICS;TIME