Understanding the balance between ionic and dispersion interactions in aqueous micellar media

Article Abstract:

The interaction of selected rhodamine alkyl esters are studied with cationic, anionic, and neutral micelles to elucidate the balance between ionic and dispersion forces operative in the systems using steady-state and time-resolved optical spectroscopies. Dispersion interactions assume substantial importance in determining the dynamics of micellar media because of the ionic compensation effect, according to observation.

Ions, Optical properties, Chemistry, Physical and theoretical, Physical chemistry, Alkyl groups

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Dynamics of 7-azatryptophan and tryptophan derivatives in micellar media. The role of ionic charge and substituent structure

Article Abstract:

The motional and population relaxation dynamics of several derivatives of 7-azatryptophan (7AT) and tryptophan (TRP) in anionic, cationic and neutral surfactant solutions above the surfactant critical micelle concentrations is investigated. The studies indicate persistent interactions between probe and micelle, which are determined by a balance between ionic charges and dispersion interactions.

Surface active agents, Surface Active Agent Manufacturing, Anionic Surfactants, Cationic Surfactants, Tryptophan, Chemical properties, Atomic properties

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Gauging molecular interactions between substrates and adsorbates, substrate mediation of surface-bound chromophore vibronic coupling

Article Abstract:

It was found that the steady-state spectroscopy of pyrene chromophores bound to several interfaces points to extensive aggregation. Time-resolved measurements indicate that there was substantial coupling between the pyrene chromophone and conductive substrates.

Spectra, Substrates, Chromophores

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