Subpicosecond resolution studies of solvation dynamics in polar aprotic and alcohol solvents

Articles you may be interested in Mechanisms of solvation dynamics of polyatomic solutes in polar and nondipolar solvents: A simulation study Molecular dynamics study of solvation effects on acid dissociation in aprotic media Relaxation dynamics of a polar solvent cage around a nonpolar electronically excited solvent probe. A subpicosecond laser study AIP Conf. Transient solvation of polar dye molecules in polar aprotic solvents Summary Abstract: Surface science model studies of Cs solvation by protic and aprotic solvents Subpicosecond resolution measurements of the kinetics of dipolar solvation have been made. The time resolved Stokes shift of a dye molecule, LDS-750 was measured using the fluorescence upconversion technique in the solvents acetonitrile, DMSO, nitrobenzene, methanol, and n-butanol. The solvation dynamics in both aprotic and alcohol solvents occur on a time scale roughly given by the longitudinal relaxation time as predicted by simple continuum theories. The relaxation in nitrobenzene and butanol is nonexponential and the relaxation in methanol is significantly faster than the calculated time. These deviations from simple theory are discussed in the context of (i) the significance of high frequency dispersions in the dielectric response, (ii) translational contributions to the solvent relaxation, and (iii) molecular aspects of the solvation not accounted in the continuum description.