Surface-assisted transient displacement charge technique. II. Effect of gases on photoinduced charge transfer in self-assembled monolayers

Article Abstract:

Surface-assisted photoindcued transient displacement charge (SPTDC) technique was used to study charge transfer in self-assembled monolayers of 7-diethylaminocoumarin covalently linked to an oxide surface in the atmosphere of different gases. The dipole signal was found to be opposite to that in solution and dependent on the nature of the gas and its pressure and the effect is due to the collision-induced relaxation which prevents molecules from uninhibited tilting onto the surface.

Monomolecular films, Charge transfer, Dipole moments, Collisions (Nuclear physics), Particle collisions, Structure

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Fluorescence studies in a pyrrolidinium ionic liquid: Polarity of the medium and solvation dynamics

Article Abstract:

The fluorescence behavior of coumarin-153 (C153), 4-aminophthalimide (AP) and 6-propionyl-2-dimethylaminonaphthalene (PRODAN) in a pyrrolidinium ionic liquid, N-butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide [bmpy][Tf2N] is examined. Wavelength-dependent fluorescence decay behavior is exhibited by all three electron donors and a progressive shift of the fluorescence maximum is observed towards the longer wavelength with time.

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Dynamic Stokes shift and excitation wavelength dependent fluorescence of dipolar molecules in room temperature ionic liquids

Article Abstract:

The fluorescence response of dipolar systems in room temperature ionic liquids (RTILs) is explored in order to understand some of the solvent properties of the RTILs at the microscopic level. The dynamic Stokes shift of the fluorescence spectra of dipolar molecules in the picosecond (ps)-nanosecond (ns) is a common feature in RTILs and the time scale is due to the slow solvation in these media.

Analysis, Fluorescence, Ionic solutions, Chemical properties, Zwitterions

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