Effect of inclusion complexation on the photophysical behavior of diphenylamine in ß-cyclodextrin medium: a study by electronic spectra.

ABSTRACT

Spectral characteristics of diphenylamine (DPA) have been investigated in ß-cyclodextrin (ß-CDx) solution. The formation of the complex was revealed by UV, steady state and time-resolved fluorescence spectroscopy. The stoichiometry of DPAß-CDx complex, determined using Benesi-Hildebrand equation and Job's continuous variation method is 11. The binding constants calculated from various methods are reported. This inclusion complex formation from DPA and ß-CDx was also confirmed by the FT-IR spectral study and SEM image analysis of solid complex prepared by co-precipitation method.