Solute rotation and solvation dynamics in a room-temperature ionic liquid

Article Abstract:

The steady-state spectra, rotation times, and time-resolved emission spectra of the probe 4-aminophthalimide (4-AP) in the ionic liquid 1-n-butyl-3-methylimidazolium hexafluorophosphate ([bmim(super +)][PF6(super-)]) were measured over the temperature range 298-355 K. The steady-state spectroscopy indicated that the solvation energetics of 4-AP in [bmim(super +)][PF6(super-)] are comparable to those of 4-AP in highly polar but aprotic solvents such as dimethylformamide and acetonitrile.

Influence, Ionic solutions, Temperature

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Local density augmentation in supercritical solvents: electronic shifts of anthracene derivatives

Article Abstract:

Emission shifts is used to measure effective local densities surrounding anthracene and three anthracene derivatives in supercritical ethane, carbondioxide and fluoroform. To establish a relationship between emission frequency and local density, the sensitivity of each solute to the electronic and nuclear polarizability of its surroundings is calibrated using dielectric continuum models of solvatochromism together with data in the gas phase and in liquid solutions.

Cyclic crudes and intermediates, Anthracine, Usage, Observations, Fluorescence spectroscopy, Anthracene

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The photophysics and dynamics of diphenylbutadiene in alkane and perfluoroalkane solvents

Article Abstract:

Absorption and emission spectral characteristics, quantum yields, radiative and nonradiative rates, and rotation times of trans, trans-1,4-diphenyl-1,3-butadiene (DPB) in perfluoroalkane and alkane solvents are reported. The emission spectra and radiative rates show a continuous change in the character of the emitting state of DPB with solvent polarizability, presumably due to solvent-induced changes in the relative energies of the 2A(sub g) and 1B(sub u) states.

Butadiene, Polarization (Light), Phenylbutazone

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