Confinement of 4,4-diaminodiphenyl sulfone by γ -CD in micellar environment: a spectroscopic investigation.

This paper reports the double confinement of 4,4-diaminodiphenyl sulfone (Dapsone) inside γ-cyclodextrin (CD) in presence of surfactants (cationic, anionic and nonionic) using steady-state and time-resolved fluorescence spectroscopy. Interpretation of fluorescence spectra, fluorescence anisotropy and time resolved fluorescence decay of the γ-CD • Dapsone•micellar system hints at lesser microviscosity and the partial release of the probe molecule from the supramolecular host-guest complex in ionic micelles, of which greater in cationic micelles, but due to greater restriction and rigidity in presence of non-ionic micelle makes the probe more rigidly inside CD. Changes in computed rotational decay also corroborate the above findings.